feat(upload): recent-uploads gallery + per-image zoom restore

Past uploads now persist to IndexedDB (originalBlob, exif, and — once
deskew has run — the corrected blob, diagnostics, and output scale).
The upload page renders a tile grid for any entry that completed a
deskew; clicking one rehydrates the store from the cached artefacts
and drops the user straight back into Measure with their datums and
measurements intact. The section is hidden entirely when there are no
completed entries, and each tile has a hover-only delete affordance.

Canvas zoom + pan are now per-image, persisted to localStorage with a
short debounce. Re-running the deskew at a different scale clears the
saved zoom (the stale offsets would point off-image at the new
dimensions).

Other tweaks bundled here:
  • Start Over collapses the previous "Start over | New Image" group
    into a single dashed/transparent button.
  • The Measure header gets md:pl-5 so the title clears the fork-me
    ribbon on desktop.
  • Example images on the landing page swap to the IMG_8324 set, with
    a third "Measured" tile spanning the combined width that shows the
    annotation-baked output.
  • Clearing the cache now also wipes the upload + zoom caches.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/App.vue

@@ -4,7 +4,8 @@ import StepIndicator from "@/components/StepIndicator.vue"
 import ImageUpload from "@/components/ImageUpload.vue"
 import ExifViewer from "@/components/ExifViewer.vue"
 import DatumEditor from "@/components/DatumEditor.vue"
-import ResultViewer from "@/components/ResultViewer.vue"
+import DeskewViewer from "@/components/DeskewViewer.vue"
+import MeasureViewer from "@/components/MeasureViewer.vue"
 import ThemeToggle from "@/components/ThemeToggle.vue"
 import SkwikLogo from "@/components/SkwikLogo.vue"
 
@@ -50,15 +51,19 @@ const store = useAppStore()
             </div>
         </header>
 
-        <main class="mx-auto max-w-7xl px-4 py-6">
+        <!-- Bottom padding clears the fixed footer so content never sits
+             underneath it. Footer height ≈ py-3 + 1lh ≈ 2.5rem; add a
+             small buffer. -->
+        <main class="mx-auto max-w-7xl px-4 pb-16 pt-6">
             <ImageUpload v-if="store.currentStep === 1" />
             <ExifViewer v-else-if="store.currentStep === 2" />
             <DatumEditor v-else-if="store.currentStep === 3" />
-            <ResultViewer v-else-if="store.currentStep === 4" />
+            <DeskewViewer v-else-if="store.currentStep === 4" />
+            <MeasureViewer v-else-if="store.currentStep === 5" />
         </main>
 
         <footer
-            class="border-t border-border/50 py-4 text-center text-xs text-muted-foreground"
+            class="fixed inset-x-0 bottom-0 z-40 border-t border-border/50 bg-background/95 py-3 text-center text-xs text-muted-foreground backdrop-blur supports-[backdrop-filter]:bg-background/60"
         >
             Made by
             <a

src/assets/index.css

@@ -53,7 +53,7 @@
 :root {
     --background: oklch(1 0 0);
     --foreground: oklch(0.145 0 0);
-    --card: oklch(1 0 0);
+    --card: oklch(0.965 0 0);
     --card-foreground: oklch(0.145 0 0);
     --popover: oklch(1 0 0);
     --popover-foreground: oklch(0.145 0 0);
@@ -86,11 +86,11 @@
 }
 
 .dark {
-    --background: oklch(0.13 0 0);
+    --background: oklch(0.185 0 0);
     --foreground: oklch(0.95 0 0);
-    --card: oklch(0.175 0 0);
+    --card: oklch(0.235 0 0);
     --card-foreground: oklch(0.95 0 0);
-    --popover: oklch(0.205 0 0);
+    --popover: oklch(0.235 0 0);
     --popover-foreground: oklch(0.985 0 0);
     --primary: oklch(0.922 0 0);
     --primary-foreground: oklch(0.205 0 0);

src/components/CorrectedImageViewer.vue

@@ -14,6 +14,7 @@ import type {
 import { getDatumColor } from "@/lib/datums"
 import { useAppStore } from "@/stores/app"
 import { loadMeasurements, saveMeasurements } from "@/lib/measurement-cache"
+import { loadZoom, saveZoom } from "@/lib/zoom-cache"
 
 const props = defineProps<{
     imageUrl: string
@@ -124,11 +125,45 @@ function loadImg() {
         img.value = image
         imgLoaded.value = true
         fitToContainer()
+        // After auto-fit, prefer a previously-saved zoom/pan if the
+        // values still place the image inside the container — protects
+        // against stale cache entries (different image dims) that would
+        // otherwise leave the viewer staring at empty canvas.
+        const hash = store.fileHash
+        if (hash) {
+            const cached = loadZoom(hash)
+            if (cached && isZoomReasonable(cached)) {
+                viewScale.value = cached.viewScale
+                viewOffsetX.value = cached.viewOffsetX
+                viewOffsetY.value = cached.viewOffsetY
+            }
+        }
         redraw()
     }
     image.src = props.imageUrl
 }
 
+// A cached zoom/pan is "reasonable" if the image's bounding box still
+// intersects the canvas at all under that transform. Catches the
+// degenerate case where the cache outlived an image dimension change.
+function isZoomReasonable(z: {
+    viewScale: number
+    viewOffsetX: number
+    viewOffsetY: number
+}): boolean {
+    if (!Number.isFinite(z.viewScale) || z.viewScale <= 0) return false
+    if (!Number.isFinite(z.viewOffsetX) || !Number.isFinite(z.viewOffsetY))
+        return false
+    const c = containerRef.value
+    const i = img.value
+    if (!c || !i) return false
+    const left = z.viewOffsetX
+    const top = z.viewOffsetY
+    const right = left + i.naturalWidth * z.viewScale
+    const bottom = top + i.naturalHeight * z.viewScale
+    return right > 0 && bottom > 0 && left < c.clientWidth && top < c.clientHeight
+}
+
 function fitToContainer() {
     const c = containerRef.value
     const i = img.value
@@ -2085,7 +2120,7 @@ function canvasToBlob(canvas: HTMLCanvasElement): Promise<Blob> {
 }
 
 // Legacy export: bare image + scale bar, no measurements. Preserved as-is
-// for any caller still wired to it (currently none — ResultViewer's
+// for any caller still wired to it (currently none — MeasureViewer's
 // addScaleBar handles the no-measurements case directly).
 function exportWithScaleBar(): Promise<Blob> {
     const image = img.value
@@ -2250,6 +2285,24 @@ watch(
     },
     { deep: true },
 )
+
+// Persist zoom/pan with a small debounce — wheel events fire rapidly and
+// resize bursts shouldn't each hit localStorage. The debounce is short
+// enough that a normal pan-and-pause finishes saving before navigation.
+let zoomSaveTimer: ReturnType<typeof setTimeout> | null = null
+watch([viewScale, viewOffsetX, viewOffsetY], () => {
+    if (!imgLoaded.value || !store.fileHash) return
+    if (zoomSaveTimer) clearTimeout(zoomSaveTimer)
+    const hash = store.fileHash
+    zoomSaveTimer = setTimeout(() => {
+        saveZoom(hash, {
+            viewScale: viewScale.value,
+            viewOffsetX: viewOffsetX.value,
+            viewOffsetY: viewOffsetY.value,
+        })
+        zoomSaveTimer = null
+    }, 250)
+})
 </script>
 
 <template>
@@ -2441,9 +2494,10 @@ watch(
             </span>
         </div>
 
-        <!-- Canvas + side list. The parent ResultViewer clamps width to
-             max-w-4xl; widening the canvas beyond that requires a parent
-             change (see ResultViewer.vue root container). -->
+        <!-- Canvas + side list. Width is dictated by the parent — when
+             rendered inside MeasureViewer the surrounding container spans
+             the full viewport width; inside DeskewViewer it is capped at
+             the standard step width. -->
         <div class="grid gap-3 md:grid-cols-[1fr_220px]">
             <div
                 ref="containerRef"

src/components/DeskewViewer.vue

@@ -1,5 +1,5 @@
 <script setup lang="ts">
-import { ref, computed, onMounted, watch } from "vue"
+import { ref, computed, onMounted, onUnmounted, watch } from "vue"
 import { useAppStore } from "@/stores/app"
 import { deskewImage, waitForOpenCV } from "@/lib/deskew"
 import type { Datum } from "@/types"
@@ -8,12 +8,6 @@ import { Button } from "@/components/ui/button"
 import { Input } from "@/components/ui/input"
 import { Label } from "@/components/ui/label"
 import { Progress } from "@/components/ui/progress"
-import {
-    Tooltip,
-    TooltipContent,
-    TooltipProvider,
-    TooltipTrigger,
-} from "@/components/ui/tooltip"
 import {
     Card,
     CardContent,
@@ -30,30 +24,22 @@ import {
     TableHeader,
     TableRow,
 } from "@/components/ui/table"
-import CorrectedImageViewer from "@/components/CorrectedImageViewer.vue"
-// `defineExpose` in CorrectedImageViewer makes these methods available on
-// the template ref, but Vue's ComponentPublicInstance type doesn't surface
-// them automatically — we type the ref explicitly so the call is checked.
-type CorrectedImageViewerRef = InstanceType<typeof CorrectedImageViewer> & {
-    exportWithMeasurements: (opts: {
-        scope: "full" | "view"
-        includeScaleBar: boolean
-    }) => Promise<Blob>
-}
+import { loadSettings } from "@/lib/settings-cache"
 import {
-    loadSettings,
-    saveSettings,
-} from "@/lib/settings-cache"
+    loadMeasurements,
+    saveMeasurements,
+    scaleMeasurements,
+} from "@/lib/measurement-cache"
+import { patchUpload } from "@/lib/upload-cache"
+import { clearZoom } from "@/lib/zoom-cache"
 
 const store = useAppStore()
-const resultUrl = ref<string | null>(null)
-const viewerRef = ref<CorrectedImageViewerRef | null>(null)
+const previewUrl = ref<string | null>(null)
 const error = ref("")
 const hasRun = ref(false)
 const cvReady = ref(false)
 const cvLoading = ref(false)
 const showAlgoDetails = ref(false)
-const includeScaleBar = ref(false)
 const scaleInput = ref(String(store.scalePxPerMm))
 const scaleValid = computed(() => {
     const n = Number(scaleInput.value)
@@ -149,29 +135,28 @@ function computeAutoScale(): number {
 
 onMounted(() => {
     const cached = loadSettings()
-    if (cached) {
-        includeScaleBar.value = cached.includeScaleBar
+    if (cached && cached.scalePxPerMm !== DEFAULT_SCALE_PX_PER_MM) {
         // Only use cached scale if it was explicitly set before
-        if (cached.scalePxPerMm !== DEFAULT_SCALE_PX_PER_MM) {
         scaleInput.value = String(cached.scalePxPerMm)
-            return
-        }
-    }
+    } else {
         // Auto-compute a sensible default scale
         const auto = computeAutoScale()
         store.scalePxPerMm = auto
         scaleInput.value = String(auto)
+    }
+    // Re-create the preview URL if a deskew result is already cached on the
+    // store (e.g. user navigated back from Measure).
+    if (store.deskewResult) {
+        previewUrl.value = URL.createObjectURL(
+            store.deskewResult.correctedImageBlob,
+        )
+        hasRun.value = true
+    }
 })
 
-watch(
-    [() => store.scalePxPerMm, includeScaleBar],
-    () => {
-        saveSettings({
-            scalePxPerMm: store.scalePxPerMm,
-            includeScaleBar: includeScaleBar.value,
-        })
-    },
-)
+onUnmounted(() => {
+    if (previewUrl.value) URL.revokeObjectURL(previewUrl.value)
+})
 
 // Progress tracking
 const progressStep = ref(0)
@@ -234,11 +219,14 @@ async function runDeskew() {
             requestAnimationFrame(r)
         })
 
+        const newScale = store.scalePxPerMm
+        const oldScale = store.lastDeskewScale
+
         const result = await deskewImage({
             image: store.loadedImage,
             datums: store.datums,
             exif: store.exifData,
-            scalePxPerMm: store.scalePxPerMm,
+            scalePxPerMm: newScale,
             onProgress: (step, total, label) => {
                 progressStep.value = step
                 progressTotal.value = total
@@ -247,10 +235,47 @@ async function runDeskew() {
             },
         })
 
-        store.setResult(result)
+        // If the user changed the output scale between runs, the new
+        // corrected image is a different size — rescale any measurements
+        // already cached for this image so they stay anchored to the same
+        // physical features. CorrectedImageViewer reads from cache on
+        // mount, so writing here is enough; no in-memory state to sync.
+        // The cached zoom/pan also no longer makes sense once the image
+        // dimensions change, so we drop it and let fitToContainer pick
+        // a fresh default.
+        if (
+            oldScale !== null &&
+            oldScale > 0 &&
+            oldScale !== newScale &&
+            store.fileHash
+        ) {
+            const cached = loadMeasurements(store.fileHash)
+            if (cached && cached.length > 0) {
+                const scaled = scaleMeasurements(cached, newScale / oldScale)
+                saveMeasurements(store.fileHash, scaled)
+            }
+            clearZoom(store.fileHash)
+        }
 
-        if (resultUrl.value) URL.revokeObjectURL(resultUrl.value)
-        resultUrl.value = URL.createObjectURL(result.correctedImageBlob)
+        store.setResult(result, newScale)
+
+        if (previewUrl.value) URL.revokeObjectURL(previewUrl.value)
+        previewUrl.value = URL.createObjectURL(result.correctedImageBlob)
+
+        // Persist the deskew artefacts onto the upload record so the
+        // Recent Uploads gallery can reopen straight into Measure. Best
+        // effort: an IndexedDB failure shouldn't break the visible flow.
+        if (store.fileHash) {
+            try {
+                await patchUpload(store.fileHash, {
+                    correctedBlob: result.correctedImageBlob,
+                    diagnostics: result.diagnostics,
+                    scalePxPerMm: newScale,
+                })
+            } catch {
+                // ignore — gallery just won't include this entry
+            }
+        }
     } catch (e) {
         error.value = e instanceof Error ? e.message : "Deskew failed"
     } finally {
@@ -258,168 +283,27 @@ async function runDeskew() {
         store.processingStatus = ""
     }
 }
-
-function addScaleBar(image: HTMLImageElement): Promise<Blob> {
-    return new Promise((resolve, reject) => {
-        const iw = image.naturalWidth
-        const ih = image.naturalHeight
-        const scale = store.scalePxPerMm
-
-        const unit = Math.max(iw / 100, 8)
-        const barHeightPx = Math.round(unit * 5)
-        const canvas = document.createElement("canvas")
-        canvas.width = iw
-        canvas.height = ih + barHeightPx
-
-        const ctx = canvas.getContext("2d")
-        if (!ctx) {
-            reject(new Error("No 2D context"))
-            return
-        }
-
-        ctx.drawImage(image, 0, 0)
-
-        ctx.fillStyle = "#000"
-        ctx.fillRect(0, ih, iw, barHeightPx)
-
-        const imgWidthMm = iw / scale
-        const niceSteps = [1, 2, 5, 10, 20, 50, 100, 200, 500, 1000]
-        const targetMm = imgWidthMm * 0.2
-        let barMm = niceSteps[0] ?? 10
-        for (const s of niceSteps) {
-            barMm = s
-            if (s >= targetMm) break
-        }
-        const barWidthPx = barMm * scale
-
-        const margin = Math.round(unit * 2)
-        const barX = margin
-        const barY = ih + barHeightPx / 2
-        const barThick = Math.max(Math.round(unit * 0.6), 4)
-        const tickH = Math.round(unit * 1.5)
-        const tickW = Math.max(2, Math.round(unit * 0.15))
-
-        ctx.fillStyle = "#fff"
-        ctx.fillRect(barX, barY - barThick / 2, barWidthPx, barThick)
-        ctx.fillRect(barX, barY - tickH / 2, tickW, tickH)
-        ctx.fillRect(
-            barX + barWidthPx - tickW,
-            barY - tickH / 2,
-            tickW,
-            tickH,
-        )
-
-        const fontSize = Math.round(unit * 1.4)
-        ctx.font = `bold ${String(fontSize)}px monospace`
-        ctx.fillStyle = "#fff"
-        ctx.textAlign = "center"
-        ctx.textBaseline = "bottom"
-        ctx.fillText(
-            `${String(barMm)} mm`,
-            barX + barWidthPx / 2,
-            barY - tickH / 2 - Math.round(unit * 0.3),
-        )
-
-        const smallFont = Math.round(unit * 1)
-        ctx.textAlign = "right"
-        ctx.textBaseline = "middle"
-        ctx.font = `${String(smallFont)}px monospace`
-        ctx.fillStyle = "rgba(255,255,255,0.6)"
-        ctx.fillText(`${String(scale)} px/mm`, iw - margin, barY)
-
-        canvas.toBlob((b) => {
-            if (b) resolve(b)
-            else reject(new Error("toBlob failed"))
-        }, "image/png")
-    })
-}
-
-async function download() {
-    if (!store.deskewResult) return
-
-    let blob: Blob = store.deskewResult.correctedImageBlob
-
-    console.log("[download] includeScaleBar =", includeScaleBar.value)
-    if (includeScaleBar.value) {
-        // Load the corrected image into an HTMLImageElement for drawing
-        const imgUrl = URL.createObjectURL(
-            store.deskewResult.correctedImageBlob,
-        )
-        try {
-            const image = await new Promise<HTMLImageElement>(
-                (resolve, reject) => {
-                    const el = new Image()
-                    el.onload = () => {
-                        resolve(el)
-                    }
-                    el.onerror = () => {
-                        reject(new Error("Failed to load image"))
-                    }
-                    el.src = imgUrl
-                },
-            )
-            blob = await addScaleBar(image)
-        } finally {
-            URL.revokeObjectURL(imgUrl)
-        }
-    }
-
-    const url = URL.createObjectURL(blob)
-    const a = document.createElement("a")
-    a.href = url
-    const baseName =
-        store.originalFile?.name.replace(/\.[^.]+$/, "") ?? "output"
-    a.download = `${baseName}-skwik.png`
-    a.click()
-    URL.revokeObjectURL(url)
-}
-
-// Download the corrected image with measurement annotations baked in.
-// scope="full": natural-resolution image + overlay → `-measured.png`.
-// scope="view": current viewport (zoom/pan) + overlay → `-measured-view.png`.
-// Both honour the existing `includeScaleBar` toggle. View export's bar is
-// sized for the on-screen pixel scale (image-px/mm × CSS view scale) so it
-// represents the same physical mm length the user is actually looking at.
-async function downloadMeasured(scope: "full" | "view") {
-    const viewer = viewerRef.value
-    if (!viewer || !store.deskewResult) return
-    try {
-        const blob = await viewer.exportWithMeasurements({
-            scope,
-            includeScaleBar: includeScaleBar.value,
-        })
-        const url = URL.createObjectURL(blob)
-        const a = document.createElement("a")
-        a.href = url
-        const baseName =
-            store.originalFile?.name.replace(/\.[^.]+$/, "") ?? "output"
-        a.download =
-            scope === "full"
-                ? `${baseName}-measured.png`
-                : `${baseName}-measured-view.png`
-        a.click()
-        URL.revokeObjectURL(url)
-    } catch (e) {
-        error.value =
-            e instanceof Error ? e.message : "Measured export failed"
-    }
-}
-
 </script>
 
 <template>
     <div class="mx-auto max-w-4xl space-y-6">
-        <div class="flex items-center justify-between">
+        <div class="flex items-center justify-between gap-2">
             <div>
-                <h2 class="text-xl font-semibold">Process &amp; Download</h2>
+                <h2 class="text-xl font-semibold">Deskew</h2>
                 <p class="text-sm text-muted-foreground">
-                    Set the output scale, run perspective correction, and
-                    download.
+                    Set the output scale and run perspective correction.
                 </p>
             </div>
+            <div class="flex shrink-0 gap-2">
                 <Button variant="outline" @click="store.goToStep(3)"
                     >Back</Button
                 >
+                <Button
+                    :disabled="!store.canProceedToStep5"
+                    @click="store.goToStep(5)"
+                    >Next: Measure</Button
+                >
+            </div>
         </div>
 
         <!-- Scale setting -->
@@ -510,7 +394,7 @@ async function downloadMeasured(scope: "full" | "view") {
                         {{ datum.label }}
                         <span class="ml-1 font-mono text-xs">{{
                             datum.type === "rectangle"
-                                ? `${datum.widthMm}\u00D7${datum.heightMm}mm`
+                                ? `${datum.widthMm}×${datum.heightMm}mm`
                                 : datum.type === "line"
                                   ? `${datum.lengthMm}mm`
                                   : `⌀${datum.diameterMm}mm`
@@ -594,7 +478,7 @@ async function downloadMeasured(scope: "full" | "view") {
         </p>
 
         <!-- Result -->
-        <template v-if="store.deskewResult && resultUrl">
+        <template v-if="store.deskewResult && previewUrl">
             <!-- Diagnostics -->
             <Card>
                 <CardHeader>
@@ -847,55 +731,33 @@ async function downloadMeasured(scope: "full" | "view") {
                 </CardContent>
             </Card>
 
-            <!-- Corrected image with tools — full-bleed to use the whole page width
-                 even though the surrounding column is capped at max-w-4xl. -->
-            <div
-                class="relative left-1/2 w-screen -translate-x-1/2 px-4"
-            >
+            <!-- Deskewed preview -->
             <Card>
                 <CardHeader>
                     <CardTitle class="text-base"
-                            >Corrected Image</CardTitle
+                        >Deskewed Preview</CardTitle
                     >
+                    <CardDescription>
+                        Continue to <strong>Measure</strong> to add
+                        annotations and download.
+                    </CardDescription>
                 </CardHeader>
                 <CardContent>
-                        <CorrectedImageViewer
-                            ref="viewerRef"
-                            :image-url="resultUrl"
-                            :scale-px-per-mm="store.scalePxPerMm"
+                    <div
+                        class="flex items-center justify-center overflow-hidden rounded-md bg-muted"
+                    >
+                        <img
+                            :src="previewUrl"
+                            alt="Deskewed image preview"
+                            class="max-h-[480px] w-full object-contain"
                         />
+                    </div>
                 </CardContent>
             </Card>
-            </div>
 
-            <!-- Download -->
-            <div class="flex flex-col items-center gap-3 pb-8">
-                <TooltipProvider>
-                    <Tooltip>
-                        <TooltipTrigger as-child>
-                            <label
-                                class="flex cursor-pointer items-center gap-2 select-none"
-                            >
-                                <input
-                                    v-model="includeScaleBar"
-                                    type="checkbox"
-                                    class="h-4 w-4 accent-primary"
-                                />
-                                <span
-                                    class="text-sm text-muted-foreground"
-                                    >Include scale bar in export</span
-                                >
-                            </label>
-                        </TooltipTrigger>
-                        <TooltipContent side="top" class="max-w-xs">
-                            Appends a black bar at the bottom of the
-                            exported image with a measurement scale and
-                            px/mm annotation.
-                        </TooltipContent>
-                    </Tooltip>
-                </TooltipProvider>
-                <div class="flex flex-wrap items-center justify-center gap-3">
-                    <Button size="lg" @click="download">
+            <div class="flex justify-center pb-8">
+                <Button size="lg" @click="store.goToStep(5)">
+                    Continue to Measure
                     <svg
                         xmlns="http://www.w3.org/2000/svg"
                         width="18"
@@ -906,114 +768,12 @@ async function downloadMeasured(scope: "full" | "view") {
                         stroke-width="2"
                         stroke-linecap="round"
                         stroke-linejoin="round"
-                            class="mr-2"
+                        class="ml-2"
                     >
-                            <path
-                                d="M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4"
-                            />
-                            <polyline points="7 10 12 15 17 10" />
-                            <line
-                                x1="12"
-                                x2="12"
-                                y1="15"
-                                y2="3"
-                            />
+                        <path d="M5 12h14" />
+                        <path d="m12 5 7 7-7 7" />
                     </svg>
-                        Download PNG
                 </Button>
-                    <TooltipProvider>
-                        <Tooltip>
-                            <TooltipTrigger as-child>
-                                <Button
-                                    size="lg"
-                                    variant="secondary"
-                                    @click="downloadMeasured('full')"
-                                >
-                                    <svg
-                                        xmlns="http://www.w3.org/2000/svg"
-                                        width="18"
-                                        height="18"
-                                        viewBox="0 0 24 24"
-                                        fill="none"
-                                        stroke="currentColor"
-                                        stroke-width="2"
-                                        stroke-linecap="round"
-                                        stroke-linejoin="round"
-                                        class="mr-2"
-                                    >
-                                        <path d="M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4" />
-                                        <polyline points="7 10 12 15 17 10" />
-                                        <line x1="12" x2="12" y1="15" y2="3" />
-                                        <path d="M3 3h6" />
-                                    </svg>
-                                    Download full + measurements
-                                </Button>
-                            </TooltipTrigger>
-                            <TooltipContent side="top" class="max-w-xs">
-                                Source image at full resolution with every
-                                measurement (lines, rectangles, ellipses,
-                                angles) and labels rendered on top.
-                            </TooltipContent>
-                        </Tooltip>
-                    </TooltipProvider>
-                    <TooltipProvider>
-                        <Tooltip>
-                            <TooltipTrigger as-child>
-                                <Button
-                                    size="lg"
-                                    variant="secondary"
-                                    @click="downloadMeasured('view')"
-                                >
-                                    <svg
-                                        xmlns="http://www.w3.org/2000/svg"
-                                        width="18"
-                                        height="18"
-                                        viewBox="0 0 24 24"
-                                        fill="none"
-                                        stroke="currentColor"
-                                        stroke-width="2"
-                                        stroke-linecap="round"
-                                        stroke-linejoin="round"
-                                        class="mr-2"
-                                    >
-                                        <rect x="3" y="3" width="18" height="18" rx="2" />
-                                        <path d="M9 9h6v6H9z" />
-                                    </svg>
-                                    Download view + measurements
-                                </Button>
-                            </TooltipTrigger>
-                            <TooltipContent side="top" class="max-w-xs">
-                                Captures exactly what's visible in the
-                                viewer (current zoom and pan) with every
-                                measurement rendered on top.
-                            </TooltipContent>
-                        </Tooltip>
-                    </TooltipProvider>
-                    <Button
-                        size="lg"
-                        variant="outline"
-                        @click="store.reset()"
-                    >
-                        Process New Image
-                    </Button>
-                </div>
-                <p
-                    class="font-mono text-sm text-muted-foreground"
-                >
-                    {{
-                        store.deskewResult.diagnostics.outputWidthPx
-                    }}&times;{{
-                        store.deskewResult.diagnostics.outputHeightPx
-                    }} px &mdash;
-                    {{
-                        (
-                            store.deskewResult
-                                .correctedImageBlob.size /
-                            1024 /
-                            1024
-                        ).toFixed(1)
-                    }} MB
-                </p>
             </div>
         </template>
     </div>

src/components/ImageUpload.vue

@@ -1,11 +1,23 @@
 <script setup lang="ts">
-import { ref, onMounted } from "vue"
+import { ref, computed, onMounted, onUnmounted } from "vue"
 import { useAppStore } from "@/stores/app"
 import { loadImage } from "@/lib/image-loader"
 import { extractExif } from "@/lib/exif"
 import { hashFile } from "@/lib/file-hash"
 import { loadDatums, clearCache, getCacheSize } from "@/lib/datum-cache"
-import { clearCache as clearMeasurementCache } from "@/lib/measurement-cache"
+import {
+    clearCache as clearMeasurementCache,
+    loadMeasurements,
+} from "@/lib/measurement-cache"
+import {
+    saveUpload,
+    loadUpload,
+    listUploads,
+    deleteUpload,
+    clearUploads,
+    type UploadRecord,
+} from "@/lib/upload-cache"
+import { clearCache as clearZoomCache } from "@/lib/zoom-cache"
 import {
     Card,
     CardContent,
@@ -21,17 +33,182 @@ const isDragging = ref(false)
 const error = ref("")
 const fileInput = ref<HTMLInputElement | null>(null)
 const cacheCount = ref(0)
+const confirmingClear = ref(false)
+const recentUploads = ref<UploadRecord[]>([])
+const recentUrls = ref<Map<string, string>>(new Map())
 
 const ACCEPTED = "image/*,.heic,.heif"
+// Auto-revert the "Are you sure?" prompt after this long of inactivity
+// so a stray first click can't be confirmed minutes later.
+const CLEAR_CONFIRM_TIMEOUT_MS = 4000
 
-onMounted(() => {
-    cacheCount.value = getCacheSize()
+let confirmTimer: ReturnType<typeof setTimeout> | null = null
+
+const dateFormatter = new Intl.DateTimeFormat(undefined, {
+    dateStyle: "medium",
+    timeStyle: "short",
 })
 
-function handleClearCache() {
+// Only show entries that have a deskew result — those are the ones a
+// click can meaningfully drop the user back into Measure with. Uploads
+// that never reached deskew remain saved (so re-uploading the same file
+// still hits the cache) but don't clutter the gallery.
+const completedUploads = computed(() =>
+    recentUploads.value.filter(
+        (u) => u.correctedBlob !== undefined && u.diagnostics !== undefined,
+    ),
+)
+
+onMounted(async () => {
+    cacheCount.value = getCacheSize()
+    await refreshRecentUploads()
+})
+
+onUnmounted(() => {
+    if (confirmTimer) clearTimeout(confirmTimer)
+    for (const url of recentUrls.value.values()) URL.revokeObjectURL(url)
+})
+
+async function refreshRecentUploads() {
+    try {
+        const all = await listUploads()
+        // Revoke any URLs whose entries no longer exist (e.g. after a
+        // delete) before refreshing the map.
+        const nextHashes = new Set(all.map((u) => u.hash))
+        for (const [hash, url] of recentUrls.value) {
+            if (!nextHashes.has(hash)) {
+                URL.revokeObjectURL(url)
+                recentUrls.value.delete(hash)
+            }
+        }
+        // Mint preview URLs for every entry; we keep them alive for the
+        // lifetime of this page mount (revoked in onUnmounted).
+        for (const u of all) {
+            if (!recentUrls.value.has(u.hash)) {
+                const preview = u.correctedBlob ?? u.originalBlob
+                recentUrls.value.set(u.hash, URL.createObjectURL(preview))
+            }
+        }
+        recentUploads.value = all
+    } catch {
+        recentUploads.value = []
+    }
+}
+
+function formatDate(ms: number): string {
+    return dateFormatter.format(new Date(ms))
+}
+
+function previewUrlFor(hash: string): string {
+    return recentUrls.value.get(hash) ?? ""
+}
+
+function handleClearCacheClick() {
+    if (confirmingClear.value) {
         clearCache()
         clearMeasurementCache()
+        clearZoomCache()
+        // IndexedDB clear is async but the UI doesn't depend on its
+        // completion — fire and forget, then reload the gallery.
+        void clearUploads().then(() => refreshRecentUploads())
         cacheCount.value = 0
+        confirmingClear.value = false
+        if (confirmTimer) {
+            clearTimeout(confirmTimer)
+            confirmTimer = null
+        }
+        return
+    }
+    confirmingClear.value = true
+    if (confirmTimer) clearTimeout(confirmTimer)
+    confirmTimer = setTimeout(() => {
+        confirmingClear.value = false
+        confirmTimer = null
+    }, CLEAR_CONFIRM_TIMEOUT_MS)
+}
+
+async function handleDeleteUpload(hash: string, ev: Event) {
+    ev.stopPropagation()
+    try {
+        await deleteUpload(hash)
+        await refreshRecentUploads()
+    } catch {
+        // ignore — UI will reflect on next refresh
+    }
+}
+
+// Reopen a past upload straight in Measure. Replays the upload pipeline
+// from the cached blob (the original image is needed if the user later
+// goes back to Datums or Deskew), then stitches the cached deskew
+// artefacts and datums onto the store before navigating.
+async function restoreUpload(hash: string) {
+    error.value = ""
+    store.isProcessing = true
+    store.processingStatus = "Loading saved image..."
+
+    try {
+        const record = await loadUpload(hash)
+        if (!record) {
+            error.value = "Saved upload no longer available"
+            return
+        }
+        if (!record.correctedBlob || !record.diagnostics) {
+            error.value = "Saved upload has no deskew result"
+            return
+        }
+        const file = new File([record.originalBlob], record.filename, {
+            type: record.mimeType,
+        })
+        const { image, convertedFile } = await loadImage(file, (status) => {
+            store.processingStatus = status
+        })
+
+        const cachedDatums = loadDatums(hash) ?? []
+        const cachedMeasurements = loadMeasurements(hash) ?? []
+
+        store.setFileHash(hash)
+        store.setImage(convertedFile, image)
+        store.setExif(record.exif)
+        store.datums = cachedDatums
+        if (record.scalePxPerMm) {
+            store.scalePxPerMm = record.scalePxPerMm
+        }
+        store.setResult(
+            {
+                correctedImageBlob: record.correctedBlob,
+                diagnostics: record.diagnostics,
+            },
+            record.scalePxPerMm ?? store.scalePxPerMm,
+        )
+
+        if (cachedMeasurements.length > 0 || cachedDatums.length > 0) {
+            const parts: string[] = []
+            if (cachedDatums.length > 0) {
+                parts.push(
+                    `${String(cachedDatums.length)} datum${cachedDatums.length === 1 ? "" : "s"}`,
+                )
+            }
+            if (cachedMeasurements.length > 0) {
+                parts.push(
+                    `${String(cachedMeasurements.length)} measurement${cachedMeasurements.length === 1 ? "" : "s"}`,
+                )
+            }
+            store.cacheRestoreMessage = `Restored ${parts.join(" and ")}`
+            setTimeout(() => {
+                store.cacheRestoreMessage = ""
+            }, 4000)
+        }
+
+        // Bump max step so the indicator surfaces every prior step as
+        // navigable, just like a freshly-completed run would.
+        store.goToStep(5)
+    } catch (e) {
+        error.value =
+            e instanceof Error ? e.message : "Failed to reopen image"
+    } finally {
+        store.isProcessing = false
+        store.processingStatus = ""
+    }
 }
 
 async function handleFile(file: File) {
@@ -64,6 +241,27 @@ async function handleFile(file: File) {
             }, 4000)
         }
 
+        // Persist the upload so it shows up in the recent gallery and
+        // can be reopened later. We save the post-conversion JPEG (not
+        // the original HEIC) since that's what the rest of the app
+        // expects to load. Existing entries are merged so we keep any
+        // prior deskew artefacts attached to the same hash.
+        const existing = await loadUpload(hash).catch(() => null)
+        await saveUpload({
+            hash,
+            filename: convertedFile.name,
+            mimeType: convertedFile.type,
+            uploadedAt: existing?.uploadedAt ?? Date.now(),
+            originalBlob: convertedFile,
+            exif,
+            correctedBlob: existing?.correctedBlob,
+            diagnostics: existing?.diagnostics,
+            scalePxPerMm: existing?.scalePxPerMm,
+        }).catch(() => {
+            // IndexedDB unavailable or quota exceeded — non-fatal,
+            // gallery just won't include this upload.
+        })
+
         store.setImage(convertedFile, image)
         store.setExif(exif)
         store.goToStep(2)
@@ -92,7 +290,47 @@ function onFileSelect(e: Event) {
 <template>
     <div class="flex min-h-[60vh] items-start justify-center pt-12">
         <div class="w-full max-w-2xl space-y-6">
-            <Card>
+            <Card class="relative">
+                <!-- Clear-cache lives top-right of the upload card so it's
+                     visible without scrolling but doesn't compete with the
+                     primary drop target. Two-step confirm: first click
+                     arms it; second click within
+                     CLEAR_CONFIRM_TIMEOUT_MS commits. -->
+                <Button
+                    v-if="cacheCount > 0"
+                    variant="ghost"
+                    size="sm"
+                    class="absolute right-2 top-2 h-7 gap-1.5 text-xs"
+                    :class="
+                        confirmingClear
+                            ? 'text-destructive hover:text-destructive'
+                            : 'text-muted-foreground/60 hover:text-destructive'
+                    "
+                    @click="handleClearCacheClick"
+                >
+                    <svg
+                        xmlns="http://www.w3.org/2000/svg"
+                        width="12"
+                        height="12"
+                        viewBox="0 0 24 24"
+                        fill="none"
+                        stroke="currentColor"
+                        stroke-width="2"
+                        stroke-linecap="round"
+                        stroke-linejoin="round"
+                    >
+                        <path d="M3 6h18" />
+                        <path
+                            d="M19 6v14c0 1-1 2-2 2H7c-1 0-2-1-2-2V6"
+                        />
+                        <path d="M8 6V4c0-1 1-2 2-2h4c1 0 2 1 2 2v2" />
+                    </svg>
+                    {{
+                        confirmingClear
+                            ? "Are you sure?"
+                            : `Clear cache (${String(cacheCount)})`
+                    }}
+                </Button>
                 <CardHeader class="text-center">
                     <CardTitle class="text-lg">Load Source Image</CardTitle>
                     <CardDescription>
@@ -170,20 +408,54 @@ function onFileSelect(e: Event) {
                 </p>
                 </CardContent>
             </Card>
-            <div
-                v-if="cacheCount > 0"
-                class="flex justify-end"
+
+            <!-- Recent uploads — only rendered when there's something to
+                 show. Each tile reopens the image directly into Measure
+                 with its datums, measurements, scale and last canvas
+                 zoom restored. -->
+            <section v-if="completedUploads.length > 0" class="space-y-3">
+                <p
+                    class="text-xs font-medium uppercase tracking-wider text-muted-foreground/70"
                 >
-                <Button
-                    variant="ghost"
-                    size="sm"
-                    class="h-7 gap-1.5 text-xs text-muted-foreground/60 hover:text-destructive"
-                    @click="handleClearCache"
+                    Recent uploads
+                </p>
+                <div class="grid grid-cols-2 gap-3 sm:grid-cols-3">
+                    <button
+                        v-for="upload in completedUploads"
+                        :key="upload.hash"
+                        type="button"
+                        class="group relative overflow-hidden rounded-lg border border-border bg-card text-left transition-colors hover:border-primary/60 hover:shadow-sm focus:outline-none focus-visible:ring-2 focus-visible:ring-primary"
+                        @click="restoreUpload(upload.hash)"
+                    >
+                        <div
+                            class="aspect-video w-full overflow-hidden bg-muted"
+                        >
+                            <img
+                                :src="previewUrlFor(upload.hash)"
+                                :alt="upload.filename"
+                                class="h-full w-full object-cover transition-transform group-hover:scale-[1.02]"
+                                loading="lazy"
+                            />
+                        </div>
+                        <div class="space-y-0.5 p-2">
+                            <p class="truncate text-xs font-medium text-foreground">
+                                {{ upload.filename }}
+                            </p>
+                            <p class="truncate font-mono text-[10px] text-muted-foreground">
+                                {{ formatDate(upload.uploadedAt) }}
+                            </p>
+                        </div>
+                        <button
+                            type="button"
+                            class="absolute right-1 top-1 rounded-md bg-background/80 p-1 text-muted-foreground opacity-0 transition-opacity hover:text-destructive group-hover:opacity-100 focus:opacity-100 focus:outline-none"
+                            title="Remove from recent uploads"
+                            aria-label="Remove from recent uploads"
+                            @click="(e) => handleDeleteUpload(upload.hash, e)"
                         >
                             <svg
                                 xmlns="http://www.w3.org/2000/svg"
-                        width="12"
-                        height="12"
+                                width="14"
+                                height="14"
                                 viewBox="0 0 24 24"
                                 fill="none"
                                 stroke="currentColor"
@@ -191,15 +463,13 @@ function onFileSelect(e: Event) {
                                 stroke-linecap="round"
                                 stroke-linejoin="round"
                             >
-                        <path d="M3 6h18" />
-                        <path
-                            d="M19 6v14c0 1-1 2-2 2H7c-1 0-2-1-2-2V6"
-                        />
-                        <path d="M8 6V4c0-1 1-2 2-2h4c1 0 2 1 2 2v2" />
+                                <path d="M18 6 6 18" />
+                                <path d="m6 6 12 12" />
                             </svg>
-                    Clear cache ({{ cacheCount }})
-                </Button>
+                        </button>
+                    </button>
                 </div>
+            </section>
 
             <div class="space-y-2 text-left">
                 <p class="text-xs font-medium uppercase tracking-wider text-muted-foreground/70">Example</p>
@@ -207,7 +477,7 @@ function onFileSelect(e: Event) {
                     <div class="space-y-1.5">
                         <img
                             src="/example-before.jpg"
-                            alt="Before: angled photograph of a Pioneer CDJ-1000MK3 top case"
+                            alt="Before: angled photograph with reference paper laid flat"
                             class="w-full rounded-md border border-border object-cover"
                         />
                         <p class="text-xs text-muted-foreground">Before &mdash; angled shot</p>
@@ -215,12 +485,20 @@ function onFileSelect(e: Event) {
                     <div class="space-y-1.5">
                         <img
                             src="/example-after.jpg"
-                            alt="After: perspective-corrected front-facing view"
+                            alt="After: perspective-corrected top-down view"
                             class="w-full rounded-md border border-border object-cover"
                         />
                         <p class="text-xs text-muted-foreground">After &mdash; corrected perspective</p>
                     </div>
                 </div>
+                <div class="space-y-1.5">
+                    <img
+                        src="/example-measured.jpg"
+                        alt="Measure: the corrected image with measurement annotations baked in"
+                        class="w-full rounded-md border border-border object-cover"
+                    />
+                    <p class="text-xs text-muted-foreground">Measured &mdash; annotations baked in</p>
+                </div>
             </div>
 
             <div class="space-y-2 text-left">

src/components/MeasureViewer.vue

@@ -0,0 +1,402 @@
+<script setup lang="ts">
+import { ref, onMounted, onUnmounted, watch } from "vue"
+import { useAppStore } from "@/stores/app"
+import { Button } from "@/components/ui/button"
+import {
+    Tooltip,
+    TooltipContent,
+    TooltipProvider,
+    TooltipTrigger,
+} from "@/components/ui/tooltip"
+import {
+    Card,
+    CardContent,
+    CardHeader,
+    CardTitle,
+} from "@/components/ui/card"
+import CorrectedImageViewer from "@/components/CorrectedImageViewer.vue"
+// `defineExpose` in CorrectedImageViewer makes these methods available on
+// the template ref, but Vue's ComponentPublicInstance type doesn't surface
+// them automatically — we type the ref explicitly so the call is checked.
+type CorrectedImageViewerRef = InstanceType<typeof CorrectedImageViewer> & {
+    exportWithMeasurements: (opts: {
+        scope: "full" | "view"
+        includeScaleBar: boolean
+    }) => Promise<Blob>
+}
+import { loadSettings, saveSettings } from "@/lib/settings-cache"
+
+const store = useAppStore()
+const resultUrl = ref<string | null>(null)
+const viewerRef = ref<CorrectedImageViewerRef | null>(null)
+const error = ref("")
+const includeScaleBar = ref(false)
+
+onMounted(() => {
+    const cached = loadSettings()
+    if (cached) {
+        includeScaleBar.value = cached.includeScaleBar
+    }
+
+    if (store.deskewResult) {
+        resultUrl.value = URL.createObjectURL(
+            store.deskewResult.correctedImageBlob,
+        )
+    } else {
+        // No result yet — bounce back to Deskew. Should never happen via
+        // normal navigation since the Next button is gated, but if a user
+        // edits the URL or hot-reloads we don't want to render an empty
+        // viewer.
+        store.goToStep(4)
+    }
+})
+
+onUnmounted(() => {
+    if (resultUrl.value) URL.revokeObjectURL(resultUrl.value)
+})
+
+watch(includeScaleBar, () => {
+    saveSettings({
+        scalePxPerMm: store.scalePxPerMm,
+        includeScaleBar: includeScaleBar.value,
+    })
+})
+
+function addScaleBar(image: HTMLImageElement): Promise<Blob> {
+    return new Promise((resolve, reject) => {
+        const iw = image.naturalWidth
+        const ih = image.naturalHeight
+        const scale = store.scalePxPerMm
+
+        const unit = Math.max(iw / 100, 8)
+        const barHeightPx = Math.round(unit * 5)
+        const canvas = document.createElement("canvas")
+        canvas.width = iw
+        canvas.height = ih + barHeightPx
+
+        const ctx = canvas.getContext("2d")
+        if (!ctx) {
+            reject(new Error("No 2D context"))
+            return
+        }
+
+        ctx.drawImage(image, 0, 0)
+
+        ctx.fillStyle = "#000"
+        ctx.fillRect(0, ih, iw, barHeightPx)
+
+        const imgWidthMm = iw / scale
+        const niceSteps = [1, 2, 5, 10, 20, 50, 100, 200, 500, 1000]
+        const targetMm = imgWidthMm * 0.2
+        let barMm = niceSteps[0] ?? 10
+        for (const s of niceSteps) {
+            barMm = s
+            if (s >= targetMm) break
+        }
+        const barWidthPx = barMm * scale
+
+        const margin = Math.round(unit * 2)
+        const barX = margin
+        const barY = ih + barHeightPx / 2
+        const barThick = Math.max(Math.round(unit * 0.6), 4)
+        const tickH = Math.round(unit * 1.5)
+        const tickW = Math.max(2, Math.round(unit * 0.15))
+
+        ctx.fillStyle = "#fff"
+        ctx.fillRect(barX, barY - barThick / 2, barWidthPx, barThick)
+        ctx.fillRect(barX, barY - tickH / 2, tickW, tickH)
+        ctx.fillRect(
+            barX + barWidthPx - tickW,
+            barY - tickH / 2,
+            tickW,
+            tickH,
+        )
+
+        const fontSize = Math.round(unit * 1.4)
+        ctx.font = `bold ${String(fontSize)}px monospace`
+        ctx.fillStyle = "#fff"
+        ctx.textAlign = "center"
+        ctx.textBaseline = "bottom"
+        ctx.fillText(
+            `${String(barMm)} mm`,
+            barX + barWidthPx / 2,
+            barY - tickH / 2 - Math.round(unit * 0.3),
+        )
+
+        const smallFont = Math.round(unit * 1)
+        ctx.textAlign = "right"
+        ctx.textBaseline = "middle"
+        ctx.font = `${String(smallFont)}px monospace`
+        ctx.fillStyle = "rgba(255,255,255,0.6)"
+        ctx.fillText(`${String(scale)} px/mm`, iw - margin, barY)
+
+        canvas.toBlob((b) => {
+            if (b) resolve(b)
+            else reject(new Error("toBlob failed"))
+        }, "image/png")
+    })
+}
+
+async function download() {
+    if (!store.deskewResult) return
+
+    let blob: Blob = store.deskewResult.correctedImageBlob
+
+    if (includeScaleBar.value) {
+        const imgUrl = URL.createObjectURL(
+            store.deskewResult.correctedImageBlob,
+        )
+        try {
+            const image = await new Promise<HTMLImageElement>(
+                (resolve, reject) => {
+                    const el = new Image()
+                    el.onload = () => {
+                        resolve(el)
+                    }
+                    el.onerror = () => {
+                        reject(new Error("Failed to load image"))
+                    }
+                    el.src = imgUrl
+                },
+            )
+            blob = await addScaleBar(image)
+        } finally {
+            URL.revokeObjectURL(imgUrl)
+        }
+    }
+
+    const url = URL.createObjectURL(blob)
+    const a = document.createElement("a")
+    a.href = url
+    const baseName =
+        store.originalFile?.name.replace(/\.[^.]+$/, "") ?? "output"
+    a.download = `${baseName}-skwik.png`
+    a.click()
+    URL.revokeObjectURL(url)
+}
+
+// Download the corrected image with measurement annotations baked in.
+// scope="full": natural-resolution image + overlay → `-measured.png`.
+// scope="view": current viewport (zoom/pan) + overlay → `-measured-view.png`.
+// Both honour the existing `includeScaleBar` toggle. View export's bar is
+// sized for the on-screen pixel scale (image-px/mm × CSS view scale) so it
+// represents the same physical mm length the user is actually looking at.
+async function downloadMeasured(scope: "full" | "view") {
+    const viewer = viewerRef.value
+    if (!viewer || !store.deskewResult) return
+    try {
+        const blob = await viewer.exportWithMeasurements({
+            scope,
+            includeScaleBar: includeScaleBar.value,
+        })
+        const url = URL.createObjectURL(blob)
+        const a = document.createElement("a")
+        a.href = url
+        const baseName =
+            store.originalFile?.name.replace(/\.[^.]+$/, "") ?? "output"
+        a.download =
+            scope === "full"
+                ? `${baseName}-measured.png`
+                : `${baseName}-measured-view.png`
+        a.click()
+        URL.revokeObjectURL(url)
+    } catch (e) {
+        error.value =
+            e instanceof Error ? e.message : "Measured export failed"
+    }
+}
+</script>
+
+<template>
+    <!-- Break out of <main>'s max-w-7xl so the Measure step spans the full
+         viewport width — annotation work benefits from the extra room. -->
+    <div class="relative left-1/2 w-screen -translate-x-1/2 space-y-4 px-4">
+        <!-- Padded right of the fork-me ribbon on desktop so the title
+             text isn't clipped underneath it. -->
+        <div class="md:pl-5">
+            <h2 class="text-xl font-semibold">Measure</h2>
+            <p class="text-sm text-muted-foreground">
+                Annotate the corrected image and download.
+            </p>
+        </div>
+
+        <!-- Toolbar row: Back arrow on far left, downloads in the middle,
+             "Start over" zone (dashed New Image) on the far right. -->
+        <div class="flex flex-wrap items-center justify-between gap-3">
+            <Button
+                variant="ghost"
+                size="icon"
+                class="shrink-0"
+                aria-label="Back to Deskew"
+                title="Back to Deskew"
+                @click="store.goToStep(4)"
+            >
+                <svg
+                    xmlns="http://www.w3.org/2000/svg"
+                    width="20"
+                    height="20"
+                    viewBox="0 0 24 24"
+                    fill="none"
+                    stroke="currentColor"
+                    stroke-width="2"
+                    stroke-linecap="round"
+                    stroke-linejoin="round"
+                >
+                    <path d="M19 12H5" />
+                    <path d="m12 19-7-7 7-7" />
+                </svg>
+            </Button>
+
+            <div class="flex flex-wrap items-center gap-3">
+                <TooltipProvider>
+                    <Tooltip>
+                        <TooltipTrigger as-child>
+                            <label
+                                class="flex cursor-pointer items-center gap-2 select-none"
+                            >
+                                <input
+                                    v-model="includeScaleBar"
+                                    type="checkbox"
+                                    class="h-4 w-4 accent-primary"
+                                />
+                                <span
+                                    class="text-sm text-muted-foreground"
+                                    >Scale bar</span
+                                >
+                            </label>
+                        </TooltipTrigger>
+                        <TooltipContent side="bottom" class="max-w-xs">
+                            Appends a black bar at the bottom of the
+                            exported image with a measurement scale and
+                            px/mm annotation.
+                        </TooltipContent>
+                    </Tooltip>
+                </TooltipProvider>
+                <div class="mx-1 h-6 w-px bg-border" />
+                <Button @click="download">
+                    <svg
+                        xmlns="http://www.w3.org/2000/svg"
+                        width="16"
+                        height="16"
+                        viewBox="0 0 24 24"
+                        fill="none"
+                        stroke="currentColor"
+                        stroke-width="2"
+                        stroke-linecap="round"
+                        stroke-linejoin="round"
+                        class="mr-2"
+                    >
+                        <path
+                            d="M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4"
+                        />
+                        <polyline points="7 10 12 15 17 10" />
+                        <line x1="12" x2="12" y1="15" y2="3" />
+                    </svg>
+                    PNG
+                </Button>
+                <TooltipProvider>
+                    <Tooltip>
+                        <TooltipTrigger as-child>
+                            <Button
+                                variant="secondary"
+                                @click="downloadMeasured('full')"
+                            >
+                                <svg
+                                    xmlns="http://www.w3.org/2000/svg"
+                                    width="16"
+                                    height="16"
+                                    viewBox="0 0 24 24"
+                                    fill="none"
+                                    stroke="currentColor"
+                                    stroke-width="2"
+                                    stroke-linecap="round"
+                                    stroke-linejoin="round"
+                                    class="mr-2"
+                                >
+                                    <path
+                                        d="M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4"
+                                    />
+                                    <polyline points="7 10 12 15 17 10" />
+                                    <line x1="12" x2="12" y1="15" y2="3" />
+                                    <path d="M3 3h6" />
+                                </svg>
+                                Full + measurements
+                            </Button>
+                        </TooltipTrigger>
+                        <TooltipContent side="bottom" class="max-w-xs">
+                            Source image at full resolution with every
+                            measurement (lines, rectangles, ellipses,
+                            angles) and labels rendered on top.
+                        </TooltipContent>
+                    </Tooltip>
+                </TooltipProvider>
+                <TooltipProvider>
+                    <Tooltip>
+                        <TooltipTrigger as-child>
+                            <Button
+                                variant="secondary"
+                                @click="downloadMeasured('view')"
+                            >
+                                <svg
+                                    xmlns="http://www.w3.org/2000/svg"
+                                    width="16"
+                                    height="16"
+                                    viewBox="0 0 24 24"
+                                    fill="none"
+                                    stroke="currentColor"
+                                    stroke-width="2"
+                                    stroke-linecap="round"
+                                    stroke-linejoin="round"
+                                    class="mr-2"
+                                >
+                                    <rect
+                                        x="3"
+                                        y="3"
+                                        width="18"
+                                        height="18"
+                                        rx="2"
+                                    />
+                                    <path d="M9 9h6v6H9z" />
+                                </svg>
+                                View + measurements
+                            </Button>
+                        </TooltipTrigger>
+                        <TooltipContent side="bottom" class="max-w-xs">
+                            Captures exactly what's visible in the viewer
+                            (current zoom and pan) with every measurement
+                            rendered on top.
+                        </TooltipContent>
+                    </Tooltip>
+                </TooltipProvider>
+            </div>
+
+            <!-- Dashed transparent styling marks this as a deliberate,
+                 destructive-of-state action so it isn't mis-clicked
+                 while reaching for a download. -->
+            <Button
+                variant="outline"
+                class="border-dashed bg-transparent text-muted-foreground hover:bg-muted/40 hover:text-foreground"
+                @click="store.reset()"
+                >Start Over</Button
+            >
+        </div>
+
+        <p v-if="error" class="text-sm text-destructive">
+            {{ error }}
+        </p>
+
+        <!-- Full-width corrected image with measurement tools -->
+        <Card v-if="resultUrl">
+            <CardHeader>
+                <CardTitle class="text-base">Corrected Image</CardTitle>
+            </CardHeader>
+            <CardContent>
+                <CorrectedImageViewer
+                    ref="viewerRef"
+                    :image-url="resultUrl"
+                    :scale-px-per-mm="store.scalePxPerMm"
+                />
+            </CardContent>
+        </Card>
+    </div>
+</template>

src/components/StepIndicator.vue

@@ -9,7 +9,8 @@ const steps: { num: AppStep; label: string }[] = [
     { num: 1, label: "Upload" },
     { num: 2, label: "EXIF" },
     { num: 3, label: "Datums" },
-    { num: 4, label: "Result" },
+    { num: 4, label: "Deskew" },
+    { num: 5, label: "Measure" },
 ]
 
 function isReachable(num: AppStep): boolean {

src/lib/measurement-cache.ts

@@ -1,7 +1,59 @@
+import type { Point } from "@/types"
 import type { Measurement } from "@/types/measurements"
 
 const KEY_PREFIX = "skwik-measurements-"
 
+/** Scale every image-space point in `m` by `ratio`. Used when the user
+ *  re-runs the deskew at a different output px/mm — the corrected image
+ *  changes size, so measurements (stored in image-pixel coords) must move
+ *  with it to stay anchored to the same physical features. */
+function scalePoint(p: Point, ratio: number): Point {
+    return { x: p.x * ratio, y: p.y * ratio }
+}
+
+export function scaleMeasurements(
+    measurements: Measurement[],
+    ratio: number,
+): Measurement[] {
+    if (ratio === 1) return measurements
+    return measurements.map((m) => {
+        switch (m.type) {
+            case "line":
+                return { ...m, a: scalePoint(m.a, ratio), b: scalePoint(m.b, ratio) }
+            case "rectangle":
+                return {
+                    ...m,
+                    corners: [
+                        scalePoint(m.corners[0], ratio),
+                        scalePoint(m.corners[1], ratio),
+                        scalePoint(m.corners[2], ratio),
+                        scalePoint(m.corners[3], ratio),
+                    ],
+                }
+            case "ellipse":
+                return {
+                    ...m,
+                    center: scalePoint(m.center, ratio),
+                    axisEndA: scalePoint(m.axisEndA, ratio),
+                    axisEndB: scalePoint(m.axisEndB, ratio),
+                }
+            case "circle":
+                return {
+                    ...m,
+                    center: scalePoint(m.center, ratio),
+                    edge: scalePoint(m.edge, ratio),
+                }
+            case "angle":
+                return {
+                    ...m,
+                    vertex: scalePoint(m.vertex, ratio),
+                    armA: scalePoint(m.armA, ratio),
+                    armB: scalePoint(m.armB, ratio),
+                }
+        }
+    })
+}
+
 export function saveMeasurements(
     hash: string,
     measurements: Measurement[],

src/lib/upload-cache.ts

@@ -0,0 +1,158 @@
+import type { DeskewDiagnostics, ExifData } from "@/types"
+
+// Past uploads + their deskew artefacts live in IndexedDB rather than
+// localStorage because converted JPEGs routinely exceed localStorage's
+// per-origin quota (5–10MB) within a few photos. IndexedDB stores Blobs
+// natively (no base64 inflation) and tolerates GBs, which makes a
+// "recent uploads" gallery practical.
+
+const DB_NAME = "skwik-uploads"
+const DB_VERSION = 1
+const STORE_NAME = "uploads"
+
+/** All persisted state for a single past upload. Filled in two phases:
+ *  upload time captures `originalBlob` + `exif` + identity; deskew
+ *  completion adds `correctedBlob` + `diagnostics` + `scalePxPerMm` so
+ *  the upload can be re-opened straight into the Measure step. */
+export interface UploadRecord {
+    hash: string
+    filename: string
+    mimeType: string
+    uploadedAt: number
+    originalBlob: Blob
+    exif: ExifData
+    correctedBlob?: Blob
+    diagnostics?: DeskewDiagnostics
+    scalePxPerMm?: number
+}
+
+let dbPromise: Promise<IDBDatabase> | null = null
+
+function openDB(): Promise<IDBDatabase> {
+    if (dbPromise) return dbPromise
+    dbPromise = new Promise((resolve, reject) => {
+        const req = indexedDB.open(DB_NAME, DB_VERSION)
+        req.onupgradeneeded = () => {
+            const db = req.result
+            if (!db.objectStoreNames.contains(STORE_NAME)) {
+                const store = db.createObjectStore(STORE_NAME, {
+                    keyPath: "hash",
+                })
+                store.createIndex("uploadedAt", "uploadedAt")
+            }
+        }
+        req.onsuccess = () => {
+            resolve(req.result)
+        }
+        req.onerror = () => {
+            dbPromise = null
+            reject(req.error ?? new Error("Failed to open uploads DB"))
+        }
+    })
+    return dbPromise
+}
+
+/** Insert or replace the record for `hash`. Re-saving with new fields
+ *  (e.g. corrected blob) overwrites the previous entry. */
+export async function saveUpload(record: UploadRecord): Promise<void> {
+    const db = await openDB()
+    return new Promise<void>((resolve, reject) => {
+        const tx = db.transaction(STORE_NAME, "readwrite")
+        const req = tx.objectStore(STORE_NAME).put(record)
+        req.onsuccess = () => {
+            resolve()
+        }
+        req.onerror = () => {
+            reject(req.error ?? new Error("Failed to save upload"))
+        }
+    })
+}
+
+/** Read the existing record (if any), apply `patch`, and persist. Used by
+ *  the Deskew step to attach deskew artefacts without losing the upload
+ *  metadata captured earlier. Returns the merged record, or null if no
+ *  record exists for `hash`. */
+export async function patchUpload(
+    hash: string,
+    patch: Partial<UploadRecord>,
+): Promise<UploadRecord | null> {
+    const existing = await loadUpload(hash)
+    if (!existing) return null
+    const merged: UploadRecord = { ...existing, ...patch, hash }
+    await saveUpload(merged)
+    return merged
+}
+
+export async function loadUpload(hash: string): Promise<UploadRecord | null> {
+    const db = await openDB()
+    return new Promise((resolve, reject) => {
+        const tx = db.transaction(STORE_NAME, "readonly")
+        const req = tx.objectStore(STORE_NAME).get(hash)
+        req.onsuccess = () => {
+            resolve((req.result as UploadRecord | undefined) ?? null)
+        }
+        req.onerror = () => {
+            reject(req.error ?? new Error("Failed to load upload"))
+        }
+    })
+}
+
+/** All records, newest-first. Callers filter to entries with the fields
+ *  they care about (e.g. require `correctedBlob` for the gallery). */
+export async function listUploads(): Promise<UploadRecord[]> {
+    const db = await openDB()
+    return new Promise((resolve, reject) => {
+        const tx = db.transaction(STORE_NAME, "readonly")
+        const req = tx.objectStore(STORE_NAME).getAll()
+        req.onsuccess = () => {
+            const all = (req.result as UploadRecord[] | undefined) ?? []
+            all.sort((a, b) => b.uploadedAt - a.uploadedAt)
+            resolve(all)
+        }
+        req.onerror = () => {
+            reject(req.error ?? new Error("Failed to list uploads"))
+        }
+    })
+}
+
+export async function deleteUpload(hash: string): Promise<void> {
+    const db = await openDB()
+    return new Promise<void>((resolve, reject) => {
+        const tx = db.transaction(STORE_NAME, "readwrite")
+        const req = tx.objectStore(STORE_NAME).delete(hash)
+        req.onsuccess = () => {
+            resolve()
+        }
+        req.onerror = () => {
+            reject(req.error ?? new Error("Failed to delete upload"))
+        }
+    })
+}
+
+export async function clearUploads(): Promise<void> {
+    const db = await openDB()
+    return new Promise<void>((resolve, reject) => {
+        const tx = db.transaction(STORE_NAME, "readwrite")
+        const req = tx.objectStore(STORE_NAME).clear()
+        req.onsuccess = () => {
+            resolve()
+        }
+        req.onerror = () => {
+            reject(req.error ?? new Error("Failed to clear uploads"))
+        }
+    })
+}
+
+export async function countUploads(): Promise<number> {
+    const db = await openDB()
+    return new Promise<number>((resolve, reject) => {
+        const tx = db.transaction(STORE_NAME, "readonly")
+        const req = tx.objectStore(STORE_NAME).count()
+        req.onsuccess = () => {
+            resolve(req.result)
+        }
+        req.onerror = () => {
+            reject(req.error ?? new Error("Failed to count uploads"))
+        }
+    })
+}

src/lib/zoom-cache.ts

@@ -0,0 +1,53 @@
+// Per-image zoom + pan state for the corrected-image canvas. Persisted
+// so that revisiting the same upload restores the exact view the user
+// last left it in. Keyed by file hash, same convention as datums and
+// measurements.
+
+const KEY_PREFIX = "skwik-zoom-"
+
+export interface ZoomState {
+    /** Canvas-px / image-px scale. */
+    viewScale: number
+    /** Image origin in canvas px (top-left of the image in canvas space). */
+    viewOffsetX: number
+    viewOffsetY: number
+}
+
+export function saveZoom(hash: string, zoom: ZoomState): void {
+    try {
+        localStorage.setItem(KEY_PREFIX + hash, JSON.stringify(zoom))
+    } catch {
+        // localStorage full or unavailable — silently ignore
+    }
+}
+
+export function loadZoom(hash: string): ZoomState | null {
+    try {
+        const raw = localStorage.getItem(KEY_PREFIX + hash)
+        if (!raw) return null
+        return JSON.parse(raw) as ZoomState
+    } catch {
+        return null
+    }
+}
+
+export function clearZoom(hash: string): void {
+    try {
+        localStorage.removeItem(KEY_PREFIX + hash)
+    } catch {
+        // ignore
+    }
+}
+
+export function clearCache(): void {
+    const toRemove: string[] = []
+    for (let i = 0; i < localStorage.length; i++) {
+        const key = localStorage.key(i)
+        if (key?.startsWith(KEY_PREFIX)) {
+            toRemove.push(key)
+        }
+    }
+    for (const key of toRemove) {
+        localStorage.removeItem(key)
+    }
+}

src/stores/app.ts

@@ -23,6 +23,10 @@ export const useAppStore = defineStore("app", () => {
     )
     const fileHash = ref<string | null>(null)
     const cacheRestoreMessage = ref("")
+    /** Output px/mm of the current `deskewResult`. Set whenever a deskew
+     *  produces a new result; consumers compare against the live
+     *  `scalePxPerMm` to detect when measurements need to be rescaled. */
+    const lastDeskewScale = ref<number | null>(null)
 
     const canProceedToStep2 = computed(() => loadedImage.value !== null)
     const canProceedToStep3 = computed(() => canProceedToStep2.value)
@@ -34,6 +38,9 @@ export const useAppStore = defineStore("app", () => {
             return d.diameterMm > 0
         })
     })
+    const canProceedToStep5 = computed(
+        () => canProceedToStep4.value && deskewResult.value !== null,
+    )
 
     function setImage(file: File, image: HTMLImageElement) {
         originalFile.value = file
@@ -141,8 +148,9 @@ export const useAppStore = defineStore("app", () => {
         }
     }
 
-    function setResult(result: DeskewResult) {
+    function setResult(result: DeskewResult, scalePxPerMmUsed: number) {
         deskewResult.value = result
+        lastDeskewScale.value = scalePxPerMmUsed
     }
 
     function setFileHash(hash: string) {
@@ -163,6 +171,7 @@ export const useAppStore = defineStore("app", () => {
         scalePxPerMm.value = DEFAULT_SCALE_PX_PER_MM
         fileHash.value = null
         cacheRestoreMessage.value = ""
+        lastDeskewScale.value = null
     }
 
     return {
@@ -179,9 +188,11 @@ export const useAppStore = defineStore("app", () => {
         scalePxPerMm,
         fileHash,
         cacheRestoreMessage,
+        lastDeskewScale,
         canProceedToStep2,
         canProceedToStep3,
         canProceedToStep4,
+        canProceedToStep5,
         setImage,
         setExif,
         goToStep,

src/types/index.ts

@@ -114,7 +114,7 @@ export interface DeskewResult {
     diagnostics: DeskewDiagnostics
 }
 
-export type AppStep = 1 | 2 | 3 | 4
+export type AppStep = 1 | 2 | 3 | 4 | 5
 
 /** Pixels per mm in the output image. Default 10 (= 100 px/cm). */
 export const DEFAULT_SCALE_PX_PER_MM = 10