feat(ui): squirrel logo, fork ribbon, clickable steps, and polish

- Squirrel engineer logo (SkwikLogo.vue) with hard hat and ruler
- Matching favicon with squirrel head silhouette
- Gitea fork ribbon (top-left, desktop only, Gitea green)
- Centered header with logo, title, and subtitle
- Footer: "Made by Samuel Prevost" with GitHub link
- Clickable step indicators for previously visited steps
- Smaller datum dots (6/4 base radius with visual cap)
- Engineering-tool styling: monospace for measurements, Geist Mono
  font, deeper dark mode colors, instrument-panel header
- EXIF viewer explains why focal length matters
- Upload page describes what Skwik does

Co-Authored-By: Claude <noreply@anthropic.com>

src/App.vue

@@ -6,20 +6,44 @@ import ExifViewer from "@/components/ExifViewer.vue"
 import DatumEditor from "@/components/DatumEditor.vue"
 import ResultViewer from "@/components/ResultViewer.vue"
 import ThemeToggle from "@/components/ThemeToggle.vue"
+import SkwikLogo from "@/components/SkwikLogo.vue"
 
 const store = useAppStore()
 </script>
 
 <template>
     <div class="min-h-screen bg-background text-foreground">
+        <!-- Gitea fork ribbon — top-left, desktop only -->
+        <a
+            href="https://serv.e1n.sh/git/sam1902/skwik"
+            target="_blank"
+            rel="noopener"
+            class="github-fork-ribbon fixed left-0 top-0 z-[100] hidden md:block"
+            data-ribbon="Fork me on Gitea"
+            title="Fork me on Gitea"
+            >Fork me on Gitea</a
+        >
+
         <header
             class="sticky top-0 z-50 border-b border-border bg-background/95 backdrop-blur supports-[backdrop-filter]:bg-background/60"
         >
             <div
-                class="mx-auto flex h-14 max-w-7xl items-center justify-between px-4"
+                class="mx-auto grid h-14 max-w-7xl grid-cols-3 items-center px-4"
             >
-                <h1 class="text-lg font-semibold tracking-tight">Skwik</h1>
-                <div class="flex items-center gap-4">
+                <div><!-- spacer for ribbon --></div>
+                <div class="flex items-center justify-center gap-2">
+                    <SkwikLogo :size="28" />
+                    <h1
+                        class="font-mono text-lg font-semibold tracking-tight"
+                    >
+                        Skwik
+                    </h1>
+                    <span
+                        class="hidden text-[10px] font-medium uppercase tracking-widest text-muted-foreground sm:inline"
+                        >Perspective Correction</span
+                    >
+                </div>
+                <div class="flex items-center justify-end gap-4">
                     <StepIndicator />
                     <ThemeToggle />
                 </div>
@@ -32,5 +56,18 @@ const store = useAppStore()
             <DatumEditor v-else-if="store.currentStep === 3" />
             <ResultViewer v-else-if="store.currentStep === 4" />
         </main>
+
+        <footer
+            class="border-t border-border/50 py-4 text-center text-xs text-muted-foreground"
+        >
+            Made by
+            <a
+                href="https://github.com/usr-ein"
+                target="_blank"
+                rel="noopener"
+                class="underline underline-offset-2 transition-colors hover:text-foreground"
+                >Samuel Prevost</a
+            >
+        </footer>
     </div>
 </template>

src/assets/index.css

@@ -1,4 +1,5 @@
-@import url("https://fonts.googleapis.com/css2?family=Geist:wght@400;500;600;700&display=swap");
+
+@import url('https://fonts.googleapis.com/css2?family=Geist:wght@400;500;600;700&display=swap');
 
 @import "tailwindcss";
 
@@ -9,7 +10,8 @@
 @custom-variant dark (&:is(.dark *));
 
 @theme inline {
-    --font-sans: "Geist Variable", sans-serif;
+    --font-sans: "Geist", "Geist Variable", ui-sans-serif, sans-serif;
+    --font-mono: "Geist Mono", ui-monospace, monospace;
     --font-heading: var(--font-sans);
     --color-sidebar-ring: var(--sidebar-ring);
     --color-sidebar-border: var(--sidebar-border);
@@ -84,10 +86,10 @@
 }
 
 .dark {
-    --background: oklch(0.145 0 0);
-    --foreground: oklch(0.985 0 0);
-    --card: oklch(0.205 0 0);
-    --card-foreground: oklch(0.985 0 0);
+    --background: oklch(0.13 0 0);
+    --foreground: oklch(0.95 0 0);
+    --card: oklch(0.175 0 0);
+    --card-foreground: oklch(0.95 0 0);
     --popover: oklch(0.205 0 0);
     --popover-foreground: oklch(0.985 0 0);
     --primary: oklch(0.922 0 0);
@@ -99,7 +101,7 @@
     --accent: oklch(0.269 0 0);
     --accent-foreground: oklch(0.985 0 0);
     --destructive: oklch(0.704 0.191 22.216);
-    --border: oklch(1 0 0 / 10%);
+    --border: oklch(1 0 0 / 12%);
     --input: oklch(1 0 0 / 15%);
     --ring: oklch(0.556 0 0);
     --chart-1: oklch(0.87 0 0);
@@ -126,3 +128,63 @@
         @apply font-sans;
     }
 }
+
+/* Fork-me ribbon — adapted from github-fork-ribbon-css */
+.github-fork-ribbon {
+    width: 12.1em;
+    height: 12.1em;
+    overflow: hidden;
+    position: fixed;
+    top: 0;
+    left: 0;
+    z-index: 100;
+    pointer-events: none;
+    text-decoration: none;
+    text-indent: -999em;
+    font-size: 0.85em;
+}
+
+.github-fork-ribbon::before,
+.github-fork-ribbon::after {
+    position: absolute;
+    display: block;
+    width: 15.38em;
+    height: 1.54em;
+    top: 3.23em;
+    right: 0.5em;
+    box-sizing: content-box;
+    transform: rotate(-45deg);
+}
+
+.github-fork-ribbon::before {
+    content: "";
+    padding: 0.38em 0;
+    background-color: #2d7a2e;
+    background-image: linear-gradient(
+        to bottom,
+        rgba(255, 255, 255, 0.05),
+        rgba(0, 0, 0, 0.15)
+    );
+    box-shadow:
+        0 0.15em 0.23em 0 rgba(0, 0, 0, 0.5),
+        0 0 0 1px #5cb85c,
+        inset 0 1px 0 rgba(255, 255, 255, 0.2),
+        inset 0 -1px 0 rgba(0, 0, 0, 0.2);
+    border-top: 1px dashed rgba(255, 255, 255, 0.25);
+    border-bottom: 1px dashed rgba(255, 255, 255, 0.25);
+    pointer-events: auto;
+}
+
+.github-fork-ribbon::after {
+    content: attr(data-ribbon);
+    color: #fff;
+    font: 700 0.9em "Helvetica Neue", Helvetica, Arial, sans-serif;
+    line-height: 1.54em;
+    text-decoration: none;
+    text-align: center;
+    text-indent: 0;
+    text-shadow:
+        0 -1px 0 rgba(0, 0, 0, 0.5),
+        0 1px 2px rgba(0, 0, 0, 0.3);
+    pointer-events: auto;
+}

src/components/DatumCanvas.vue

@@ -49,19 +49,23 @@ function getPointConfigs(datum: Datum, dIdx: number) {
     const color = getDatumColor(dIdx)
     const isSelected = store.selectedDatumId === datum.id
     const points = datum.type === "rectangle" ? datum.corners : datum.endpoints
-    const radius = isSelected ? 10 : 7
+    const baseRadius = isSelected ? 6 : 4
+    const visualRadius = Math.max(
+        baseRadius / scale.value,
+        baseRadius * 0.5
+    )
 
     return points.map((pt, pIdx) => ({
         x: pt.x,
         y: pt.y,
-        radius: radius / scale.value,
+        radius: visualRadius,
         fill: color,
         stroke: isSelected ? "#fff" : color,
-        strokeWidth: 2 / scale.value,
+        strokeWidth: 1.5 / scale.value,
         draggable: true,
         _datumId: datum.id,
         _pointIndex: pIdx,
-        hitStrokeWidth: 20 / scale.value,
+        hitStrokeWidth: 12 / scale.value,
     }))
 }
 

src/components/DatumEditor.vue

@@ -1,7 +1,9 @@
 <script setup lang="ts">
-import { ref, computed } from "vue"
+import { ref, computed, watch } from "vue"
 import { useMediaQuery } from "@vueuse/core"
 import { useAppStore } from "@/stores/app"
+import { saveDatums } from "@/lib/datum-cache"
+import { Badge } from "@/components/ui/badge"
 import { Button } from "@/components/ui/button"
 import {
     Tooltip,
@@ -40,6 +42,16 @@ const nextTooltip = computed(() => {
     const names = incompleteDatums.value.map((d) => d.label)
     return `Missing dimensions: ${names.join(", ")}`
 })
+
+watch(
+    () => store.datums,
+    (datums) => {
+        if (store.fileHash && datums.length > 0) {
+            saveDatums(store.fileHash, datums)
+        }
+    },
+    { deep: true },
+)
 </script>
 
 <template>
@@ -77,6 +89,16 @@ const nextTooltip = computed(() => {
             </div>
         </div>
 
+        <Transition name="fade">
+            <Badge
+                v-if="store.cacheRestoreMessage"
+                variant="secondary"
+                class="text-xs"
+            >
+                {{ store.cacheRestoreMessage }}
+            </Badge>
+        </Transition>
+
         <!-- Single layout: canvas always present, sidebar conditionally placed -->
         <div
             class="grid gap-4"

src/components/ExifViewer.vue

@@ -149,7 +149,9 @@ function getExifRows(): ExifRow[] {
                                 <TableCell class="font-medium">{{
                                     row.label
                                 }}</TableCell>
-                                <TableCell>{{ row.value }}</TableCell>
+                                <TableCell class="font-mono text-sm">{{
+                    row.value
+                }}</TableCell>
                             </TableRow>
                         </TableBody>
                     </Table>
@@ -179,26 +181,31 @@ function getExifRows(): ExifRow[] {
                     </svg>
                     <div class="text-sm text-muted-foreground">
                         <p class="font-medium text-foreground">
-                            Lens Correction Info
+                            Why EXIF matters
                         </p>
                         <p class="mt-1">
+                            Focal length and lens model data allow the
+                            algorithm to estimate radial distortion
+                            (barrel/pincushion) introduced by the lens.
+                            Without this, the perspective correction relies
+                            solely on the datum geometry you provide.
+                        </p>
+                        <p class="mt-2">
                             <template v-if="store.exifData.focalLength">
-                                This image was shot at
-                                <strong
-                                    >{{ store.exifData.focalLength }}mm</strong
+                                Detected
+                                <span class="font-mono font-medium text-foreground"
+                                    >{{ store.exifData.focalLength }}mm</span
                                 >
                                 <template v-if="store.exifData.lensModel">
-                                    with a
-                                    <strong>{{
+                                    on
+                                    <span class="font-medium text-foreground">{{
                                         store.exifData.lensModel
-                                    }}</strong> </template
-                                >. The deskew algorithm can use this to correct
-                                barrel/pincushion distortion.
+                                    }}</span> </template
+                                >. Lens correction will be applied.
                             </template>
                             <template v-else>
-                                No focal length data found. The algorithm will
-                                rely solely on datum measurements for
-                                perspective correction.
+                                No focal length found. Lens distortion
+                                correction will be skipped.
                             </template>
                         </p>
                     </div>

src/components/SkwikLogo.vue

@@ -0,0 +1,280 @@
+<script setup lang="ts">
+withDefaults(
+    defineProps<{
+        size?: number
+    }>(),
+    {
+        size: 28,
+    }
+)
+</script>
+
+<template>
+    <svg
+        xmlns="http://www.w3.org/2000/svg"
+        viewBox="0 0 64 64"
+        :width="size"
+        :height="size"
+        aria-label="Skwik squirrel logo"
+    >
+        <!-- Tail (fluffy, curling up behind) -->
+        <path
+            d="M50 52 Q58 40 54 28 Q52 22 48 20
+               Q55 18 56 12 Q56 8 52 10
+               Q48 12 46 18"
+            fill="none"
+            stroke="currentColor"
+            stroke-width="2.5"
+            stroke-linecap="round"
+            stroke-linejoin="round"
+            opacity="0.7"
+        />
+
+        <!-- Body -->
+        <ellipse
+            cx="32"
+            cy="46"
+            rx="12"
+            ry="10"
+            fill="none"
+            stroke="currentColor"
+            stroke-width="2"
+        />
+
+        <!-- Head -->
+        <ellipse
+            cx="32"
+            cy="28"
+            rx="12"
+            ry="13"
+            fill="none"
+            stroke="currentColor"
+            stroke-width="2"
+        />
+
+        <!-- Ear tufts -->
+        <path
+            d="M22 18 Q18 10 14 12 Q12 16 20 20"
+            fill="none"
+            stroke="currentColor"
+            stroke-width="2"
+            stroke-linecap="round"
+            stroke-linejoin="round"
+        />
+        <path
+            d="M42 18 Q46 10 50 12 Q52 16 44 20"
+            fill="none"
+            stroke="currentColor"
+            stroke-width="2"
+            stroke-linecap="round"
+            stroke-linejoin="round"
+        />
+
+        <!-- Eyes -->
+        <circle
+            cx="27"
+            cy="26"
+            r="3"
+            fill="currentColor"
+        />
+        <circle
+            cx="37"
+            cy="26"
+            r="3"
+            fill="currentColor"
+        />
+        <!-- Eye shine -->
+        <circle cx="28.2" cy="25" r="1" fill="var(--background, #fff)" />
+        <circle cx="38.2" cy="25" r="1" fill="var(--background, #fff)" />
+
+        <!-- Nose -->
+        <ellipse
+            cx="32"
+            cy="32"
+            rx="2"
+            ry="1.5"
+            fill="currentColor"
+        />
+
+        <!-- Cheeks -->
+        <ellipse
+            cx="24"
+            cy="32"
+            rx="4"
+            ry="3"
+            fill="none"
+            stroke="currentColor"
+            stroke-width="1"
+            opacity="0.3"
+        />
+        <ellipse
+            cx="40"
+            cy="32"
+            rx="4"
+            ry="3"
+            fill="none"
+            stroke="currentColor"
+            stroke-width="1"
+            opacity="0.3"
+        />
+
+        <!-- Mouth -->
+        <path
+            d="M30 34 Q32 36 34 34"
+            fill="none"
+            stroke="currentColor"
+            stroke-width="1.2"
+            stroke-linecap="round"
+        />
+
+        <!-- Arms holding ruler -->
+        <path
+            d="M20 42 L12 38"
+            stroke="currentColor"
+            stroke-width="2"
+            stroke-linecap="round"
+        />
+        <path
+            d="M44 42 L52 38"
+            stroke="currentColor"
+            stroke-width="2"
+            stroke-linecap="round"
+        />
+
+        <!-- Ruler (held diagonally) -->
+        <rect
+            x="4"
+            y="34"
+            width="22"
+            height="4"
+            rx="0.5"
+            fill="none"
+            stroke="currentColor"
+            stroke-width="1.5"
+            transform="rotate(-15 15 36)"
+        />
+        <!-- Ruler tick marks -->
+        <line
+            x1="8" y1="34" x2="8" y2="36"
+            stroke="currentColor"
+            stroke-width="1"
+            transform="rotate(-15 15 36)"
+        />
+        <line
+            x1="12" y1="34" x2="12" y2="36"
+            stroke="currentColor"
+            stroke-width="1"
+            transform="rotate(-15 15 36)"
+        />
+        <line
+            x1="16" y1="34" x2="16" y2="36"
+            stroke="currentColor"
+            stroke-width="1"
+            transform="rotate(-15 15 36)"
+        />
+        <line
+            x1="20" y1="34" x2="20" y2="36"
+            stroke="currentColor"
+            stroke-width="1"
+            transform="rotate(-15 15 36)"
+        />
+
+        <!-- Safety goggles on forehead -->
+        <path
+            d="M22 20 Q27 17 32 18 Q37 17 42 20"
+            fill="none"
+            stroke="#f59e0b"
+            stroke-width="2"
+            stroke-linecap="round"
+        />
+        <!-- Goggle lenses -->
+        <ellipse
+            cx="26"
+            cy="20"
+            rx="3.5"
+            ry="2.5"
+            fill="none"
+            stroke="#f59e0b"
+            stroke-width="1.5"
+        />
+        <ellipse
+            cx="38"
+            cy="20"
+            rx="3.5"
+            ry="2.5"
+            fill="none"
+            stroke="#f59e0b"
+            stroke-width="1.5"
+        />
+        <!-- Goggle bridge -->
+        <path
+            d="M29.5 20 Q32 19 34.5 20"
+            fill="none"
+            stroke="#f59e0b"
+            stroke-width="1.2"
+        />
+        <!-- Goggle lens tint -->
+        <ellipse
+            cx="26"
+            cy="20"
+            rx="2.5"
+            ry="1.5"
+            fill="#f59e0b"
+            opacity="0.15"
+        />
+        <ellipse
+            cx="38"
+            cy="20"
+            rx="2.5"
+            ry="1.5"
+            fill="#f59e0b"
+            opacity="0.15"
+        />
+
+        <!-- Hard hat -->
+        <path
+            d="M18 16 Q18 6 32 5 Q46 6 46 16"
+            fill="none"
+            stroke="#f59e0b"
+            stroke-width="2.5"
+            stroke-linecap="round"
+            stroke-linejoin="round"
+        />
+        <!-- Hat brim -->
+        <path
+            d="M16 16 L48 16"
+            stroke="#f59e0b"
+            stroke-width="2"
+            stroke-linecap="round"
+        />
+        <!-- Hat dome highlight -->
+        <path
+            d="M26 9 Q32 7 38 9"
+            fill="none"
+            stroke="#fbbf24"
+            stroke-width="1.5"
+            stroke-linecap="round"
+            opacity="0.6"
+        />
+
+        <!-- Feet -->
+        <ellipse
+            cx="26"
+            cy="56"
+            rx="4"
+            ry="2"
+            fill="none"
+            stroke="currentColor"
+            stroke-width="1.5"
+        />
+        <ellipse
+            cx="38"
+            cy="56"
+            rx="4"
+            ry="2"
+            fill="none"
+            stroke="currentColor"
+            stroke-width="1.5"
+        />
+    </svg>
+</template>

src/components/StepIndicator.vue

@@ -17,17 +17,32 @@ const steps = [
         <template v-for="(step, i) in steps" :key="step.num">
             <Badge
                 :variant="
-                    store.currentStep === step.num ? 'default' : 'outline'
+                    store.currentStep === step.num
+                        ? 'default'
+                        : 'outline'
                 "
-                class="cursor-default select-none text-xs"
+                class="select-none font-mono text-xs"
                 :class="{
                     'opacity-40': store.currentStep < step.num,
+                    'cursor-pointer hover:bg-accent':
+                        step.num <= store.maxStepReached
+                        && step.num !== store.currentStep,
+                    'cursor-default':
+                        step.num > store.maxStepReached
+                        || step.num === store.currentStep,
                 }"
+                @click="
+                    step.num <= store.maxStepReached
+                        ? store.goToStep(step.num)
+                        : undefined
+                "
             >
-                {{ step.num }}. {{ step.label }}
+                {{ step.num }}.{{ step.label }}
             </Badge>
-            <span v-if="i < steps.length - 1" class="text-muted-foreground"
-                >&middot;</span
+            <span
+                v-if="i < steps.length - 1"
+                class="text-xs text-muted-foreground/40"
+                >&rsaquo;</span
             >
         </template>
     </nav>