feat(result): full-bleed corrected-image card

The corrected-image card was inscribed in the same max-w-4xl column as
the controls, which capped the canvas at ~896px even on wide displays.
Wrap just that one card in a full-bleed shell (relative left-1/2 -tx-1/2
w-screen) so it spans the viewport width while leaving the surrounding
controls/diagnostics/download in their narrower column.

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

public/favicon.svg

@@ -1,43 +1,9 @@
 <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64" width="32" height="32">
-  <!-- Simplified SkwikLogo for favicon — squirrel head with hard hat and goggles -->
-
-  <!-- Head -->
-  <ellipse cx="32" cy="36" rx="16" ry="17" fill="#1a1a1a"/>
-
-  <!-- Ear tufts -->
-  <path d="M16 24 Q10 14 6 17 Q5 22 14 26" fill="#1a1a1a"/>
-  <path d="M48 24 Q54 14 58 17 Q59 22 50 26" fill="#1a1a1a"/>
-
-  <!-- Cheeks -->
-  <ellipse cx="20" cy="40" rx="5" ry="4" fill="#2a2a2a"/>
-  <ellipse cx="44" cy="40" rx="5" ry="4" fill="#2a2a2a"/>
-
-  <!-- Eyes -->
-  <circle cx="25" cy="34" r="4" fill="#fff"/>
-  <circle cx="39" cy="34" r="4" fill="#fff"/>
-  <circle cx="26" cy="33.5" r="2.4" fill="#1a1a1a"/>
-  <circle cx="40" cy="33.5" r="2.4" fill="#1a1a1a"/>
-  <!-- Eye shine -->
-  <circle cx="27" cy="32.5" r="0.9" fill="#fff"/>
-  <circle cx="41" cy="32.5" r="0.9" fill="#fff"/>
-
-  <!-- Nose -->
-  <ellipse cx="32" cy="41" rx="2.2" ry="1.5" fill="#555"/>
-  <!-- Mouth -->
-  <path d="M29.5 44 Q32 46.5 34.5 44" fill="none" stroke="#555" stroke-width="1" stroke-linecap="round"/>
-
-  <!-- Safety goggles -->
-  <path d="M16 28 Q24 24 32 25.5 Q40 24 48 28" fill="none" stroke="#f59e0b" stroke-width="2.5" stroke-linecap="round"/>
-  <ellipse cx="24" cy="28" rx="5" ry="3.5" fill="none" stroke="#f59e0b" stroke-width="2"/>
-  <ellipse cx="40" cy="28" rx="5" ry="3.5" fill="none" stroke="#f59e0b" stroke-width="2"/>
-  <path d="M29 28 Q32 26.5 35 28" fill="none" stroke="#f59e0b" stroke-width="1.5"/>
-  <ellipse cx="24" cy="28" rx="3.5" ry="2" fill="#f59e0b" opacity="0.15"/>
-  <ellipse cx="40" cy="28" rx="3.5" ry="2" fill="#f59e0b" opacity="0.15"/>
-
-  <!-- Hard hat -->
-  <path d="M12 22 Q12 8 32 6 Q52 8 52 22" fill="none" stroke="#f59e0b" stroke-width="3" stroke-linecap="round" stroke-linejoin="round"/>
-  <!-- Hat brim -->
-  <path d="M10 22 L54 22" stroke="#f59e0b" stroke-width="2.5" stroke-linecap="round"/>
-  <!-- Hat dome highlight -->
-  <path d="M24 12 Q32 9 40 12" fill="none" stroke="#fbbf24" stroke-width="2" stroke-linecap="round" opacity="0.6"/>
+  <text
+    x="50%"
+    y="50%"
+    text-anchor="middle"
+    dominant-baseline="central"
+    font-size="56"
+  >📐</text>
 </svg>

src/components/CorrectedImageViewer.vue

@@ -32,7 +32,7 @@ const viewOffsetX = ref(0)
 const viewOffsetY = ref(0)
 
 // Tool state
-type ToolMode = "none" | "line" | "ellipse" | "angle"
+type ToolMode = "none" | "line" | "rectangle" | "ellipse" | "angle"
 const activeTool = ref<ToolMode>("none")
 const showGrid = ref(false)
 const gridSpacingMm = ref(10)
@@ -48,6 +48,14 @@ interface LineMeasurement extends BaseMeasurement {
     a: Point
     b: Point
 }
+// Corner ordering [TL, TR, BR, BL] mirrors the RectDatum convention from
+// src/types/index.ts. Indices stay stable across drags even if the user
+// crosses corners — visual + hit-tests don't depend on TL actually being
+// top-left after reshape, matching the datum editor's behaviour.
+interface RectMeasurement extends BaseMeasurement {
+    type: "rectangle"
+    corners: [Point, Point, Point, Point]
+}
 interface EllipseMeasurement extends BaseMeasurement {
     type: "ellipse"
     center: Point
@@ -60,7 +68,11 @@ interface AngleMeasurement extends BaseMeasurement {
     armA: Point
     armB: Point
 }
-type Measurement = LineMeasurement | EllipseMeasurement | AngleMeasurement
+type Measurement =
+    | LineMeasurement
+    | RectMeasurement
+    | EllipseMeasurement
+    | AngleMeasurement
 
 const measurements = ref<Measurement[]>([])
 const selectedId = ref<string | null>(null)
@@ -79,7 +91,11 @@ let isPanning = false
 let panStart = { x: 0, y: 0 }
 let lastPinchDist = 0
 
-// Drag state for moving/reshaping committed measurements.
+// Drag state for moving/reshaping committed measurements. We don't gate
+// drag-start on a movement threshold — handles begin tracking the cursor
+// on the very first move event so positioning feels precise (matches
+// Konva's behaviour in the datum editor). A pure click without movement
+// never enters pointerMove, so selection on its own remains drift-free.
 type DragMode = "none" | "move" | "handle"
 interface DragState {
     mode: DragMode
@@ -90,14 +106,8 @@ interface DragState {
     startImg: Point
     // Snapshot of the measurement at drag start, for delta-based updates.
     startSnapshot: Measurement
-    // Did this pointer down actually move? Used to distinguish click vs drag.
-    moved: boolean
 }
 let dragState: DragState | null = null
-// Pixel threshold in screen space before a press becomes a drag. Small enough
-// that intentional drags feel responsive; large enough that a shaky click
-// still registers as a click.
-const DRAG_THRESHOLD_PX = 3
 
 function loadImg() {
     const image = new Image()
@@ -293,6 +303,35 @@ function angleDegrees(m: AngleMeasurement): number {
     return (rad * 180) / Math.PI
 }
 
+// Width = mean of TL→TR and BL→BR (the two "horizontal" sides under the
+// stored ordering). Height = mean of TL→BL and TR→BR. This averages out
+// minor non-rectangular skew the user may introduce while reshaping.
+function rectDimensionsMm(m: RectMeasurement): { widthMm: number; heightMm: number } {
+    const [tl, tr, br, bl] = m.corners
+    const wTop = Math.hypot(tr.x - tl.x, tr.y - tl.y)
+    const wBot = Math.hypot(br.x - bl.x, br.y - bl.y)
+    const hLeft = Math.hypot(bl.x - tl.x, bl.y - tl.y)
+    const hRight = Math.hypot(br.x - tr.x, br.y - tr.y)
+    return {
+        widthMm: (wTop + wBot) / 2 / props.scalePxPerMm,
+        heightMm: (hLeft + hRight) / 2 / props.scalePxPerMm,
+    }
+}
+
+// Shoelace area of the quadrilateral, sign-stripped — handles skewed/
+// reshaped rectangles correctly. Crossed quads will give a smaller area
+// (common shoelace behaviour); we accept that since we don't auto-reorder.
+function rectAreaMm2(m: RectMeasurement): number {
+    const [p0, p1, p2, p3] = m.corners
+    const cross =
+        p0.x * p1.y - p1.x * p0.y +
+        p1.x * p2.y - p2.x * p1.y +
+        p2.x * p3.y - p3.x * p2.y +
+        p3.x * p0.y - p0.x * p3.y
+    const areaPx2 = Math.abs(cross) / 2
+    return areaPx2 / (props.scalePxPerMm * props.scalePxPerMm)
+}
+
 function formatMm(v: number): string {
     return v >= 10 ? v.toFixed(1) : v.toFixed(2)
 }
@@ -303,10 +342,21 @@ function formatArea(v: number): string {
     return v.toFixed(2)
 }
 
+// Spec for rectangle area readout: 0 decimals when ≥ 100 mm², else 1.
+function formatRectArea(v: number): string {
+    if (v >= 100) return v.toFixed(0)
+    return v.toFixed(1)
+}
+
 function measurementLabel(m: Measurement): string {
     if (m.type === "line") {
         return `${formatMm(lineLengthMm(m))} mm`
     }
+    if (m.type === "rectangle") {
+        const { widthMm, heightMm } = rectDimensionsMm(m)
+        const area = rectAreaMm2(m)
+        return `${widthMm.toFixed(1)} × ${heightMm.toFixed(1)} mm · ${formatRectArea(area)} mm²`
+    }
     if (m.type === "ellipse") {
         const { semiMajor, semiMinor } = ellipseAxesMm(m)
         const area = Math.PI * semiMajor * semiMinor
@@ -317,16 +367,34 @@ function measurementLabel(m: Measurement): string {
 
 function measurementTypeLabel(m: Measurement): string {
     if (m.type === "line") return "Line"
+    if (m.type === "rectangle") return "Rect"
     if (m.type === "ellipse") return "Ellipse"
     return "Angle"
 }
 
+// Side-panel summary uses the shorter "w×h mm" without the area suffix per
+// the spec — a separate format from the on-canvas label.
+function measurementSummaryValue(m: Measurement): string {
+    if (m.type === "rectangle") {
+        const { widthMm, heightMm } = rectDimensionsMm(m)
+        return `${widthMm.toFixed(1)}×${heightMm.toFixed(1)} mm`
+    }
+    return measurementLabel(m)
+}
+
 // Anchor point in image space where we place the label. Chosen per type so
 // the label sits in a predictable, non-occluding position.
 function labelAnchor(m: Measurement): Point {
     if (m.type === "line") {
         return { x: (m.a.x + m.b.x) / 2, y: (m.a.y + m.b.y) / 2 }
     }
+    if (m.type === "rectangle") {
+        const [p0, p1, p2, p3] = m.corners
+        return {
+            x: (p0.x + p1.x + p2.x + p3.x) / 4,
+            y: (p0.y + p1.y + p2.y + p3.y) / 4,
+        }
+    }
     if (m.type === "ellipse") {
         return m.center
     }
@@ -370,6 +438,8 @@ function drawMeasurement(
 
     if (m.type === "line") {
         drawLineGeometry(ctx, m, strokeColor, baseColor, lineWidth, isSelected)
+    } else if (m.type === "rectangle") {
+        drawRectGeometry(ctx, m, strokeColor, baseColor, lineWidth, isSelected)
     } else if (m.type === "ellipse") {
         drawEllipseGeometry(ctx, m, strokeColor, baseColor, lineWidth, isSelected)
     } else {
@@ -403,6 +473,35 @@ function drawLineGeometry(
     drawHandle(ctx, sb, handleColor, isSelected)
 }
 
+function drawRectGeometry(
+    ctx: CanvasRenderingContext2D,
+    m: RectMeasurement,
+    strokeColor: string,
+    handleColor: string,
+    lineWidth: number,
+    isSelected: boolean,
+) {
+    const screenCorners = m.corners.map(imgToScreen)
+    ctx.beginPath()
+    for (let i = 0; i < screenCorners.length; i++) {
+        const p = screenCorners[i]
+        if (!p) continue
+        if (i === 0) ctx.moveTo(p.x, p.y)
+        else ctx.lineTo(p.x, p.y)
+    }
+    ctx.closePath()
+    ctx.strokeStyle = strokeColor
+    ctx.lineWidth = lineWidth
+    ctx.setLineDash(isSelected ? [] : [6, 3])
+    ctx.stroke()
+    ctx.setLineDash([])
+    // Don't fill the interior — keeps what's underneath visible, matching
+    // the line/ellipse/angle visual style.
+    for (const p of screenCorners) {
+        drawHandle(ctx, p, handleColor, isSelected)
+    }
+}
+
 function drawEllipseGeometry(
     ctx: CanvasRenderingContext2D,
     m: EllipseMeasurement,
@@ -612,6 +711,12 @@ function drawPlacementPreview(ctx: CanvasRenderingContext2D) {
         ctx.moveTo(sPts[0].x, sPts[0].y)
         ctx.lineTo(sCursor.x, sCursor.y)
         ctx.stroke()
+    } else if (activeTool.value === "rectangle" && sPts.length >= 1 && sPts[0] && sCursor) {
+        const a = sPts[0]
+        const b = sCursor
+        ctx.beginPath()
+        ctx.rect(a.x, a.y, b.x - a.x, b.y - a.y)
+        ctx.stroke()
     } else if (activeTool.value === "ellipse" && sPts.length >= 1 && sPts[0]) {
         const center = sPts[0]
         const endA = sPts[1] ?? sCursor
@@ -700,6 +805,24 @@ function pointToSegmentDistance(
     return Math.hypot(p.x - qx, p.y - qy)
 }
 
+// Standard ray-cast point-in-polygon. Works for any simple quadrilateral
+// (including reshaped non-rect cases) and gracefully degrades to a small
+// or zero region for crossed quads — which is what we want, since a
+// "crossed" rectangle is effectively user error.
+function pointInPolygon(p: Point, poly: Point[]): boolean {
+    let inside = false
+    for (let i = 0, j = poly.length - 1; i < poly.length; j = i, i++) {
+        const pi = poly[i]
+        const pj = poly[j]
+        if (!pi || !pj) continue
+        const intersect =
+            pi.y > p.y !== pj.y > p.y &&
+            p.x < ((pj.x - pi.x) * (p.y - pi.y)) / (pj.y - pi.y) + pi.x
+        if (intersect) inside = !inside
+    }
+    return inside
+}
+
 // Returns the min screen-space distance from cursor to the ellipse curve.
 // Sampled parametrically; 96 samples is overkill for hit-testing but cheap.
 function ellipseCurveDistance(
@@ -743,6 +866,14 @@ function getHandlePositions(m: Measurement): { key: string; pt: Point }[] {
             { key: "b", pt: m.b },
         ]
     }
+    if (m.type === "rectangle") {
+        return [
+            { key: "c0", pt: m.corners[0] },
+            { key: "c1", pt: m.corners[1] },
+            { key: "c2", pt: m.corners[2] },
+            { key: "c3", pt: m.corners[3] },
+        ]
+    }
     if (m.type === "ellipse") {
         return [
             { key: "center", pt: m.center },
@@ -803,6 +934,23 @@ function hitTest(cursorScreen: Point): HitResult | null {
             if (pointToSegmentDistance(cursorScreen, sa, sb) <= LINE_HIT_PX) {
                 return { measurementId: m.id, kind: "geometry", handleKey: null }
             }
+        } else if (m.type === "rectangle") {
+            const sc = m.corners.map(imgToScreen)
+            // Edge-near test for thin grabs along the border.
+            let edgeHit = false
+            for (let i = 0; i < 4; i++) {
+                const a = sc[i]
+                const b = sc[(i + 1) % 4]
+                if (a && b && pointToSegmentDistance(cursorScreen, a, b) <= LINE_HIT_PX) {
+                    edgeHit = true
+                    break
+                }
+            }
+            // Interior-fill test so a big rect is grabbable from anywhere
+            // inside, not just along the 6px edge band.
+            if (edgeHit || pointInPolygon(cursorScreen, sc)) {
+                return { measurementId: m.id, kind: "geometry", handleKey: null }
+            }
         } else if (m.type === "ellipse") {
             if (ellipseCurveDistance(cursorScreen, m) <= ELLIPSE_HIT_PX) {
                 return { measurementId: m.id, kind: "geometry", handleKey: null }
@@ -838,6 +986,28 @@ function commitPlacement() {
         colorCounter += 1
         selectedId.value = id
         placementPoints.value = []
+    } else if (activeTool.value === "rectangle" && pts.length === 2) {
+        const [p1, p2] = pts as [Point, Point]
+        // Normalise so corners are TL/TR/BR/BL regardless of click order.
+        const minX = Math.min(p1.x, p2.x)
+        const maxX = Math.max(p1.x, p2.x)
+        const minY = Math.min(p1.y, p2.y)
+        const maxY = Math.max(p1.y, p2.y)
+        const id = nanoid()
+        measurements.value.push({
+            id,
+            type: "rectangle",
+            colorIndex: colorCounter,
+            corners: [
+                { x: minX, y: minY },
+                { x: maxX, y: minY },
+                { x: maxX, y: maxY },
+                { x: minX, y: maxY },
+            ],
+        })
+        colorCounter += 1
+        selectedId.value = id
+        placementPoints.value = []
     } else if (activeTool.value === "ellipse" && pts.length === 3) {
         const [center, axisEndA, axisEndB] = pts as [Point, Point, Point]
         const id = nanoid()
@@ -872,7 +1042,8 @@ function commitPlacement() {
 function handlePlacementClick(imgPt: Point) {
     if (activeTool.value === "none") return
     placementPoints.value.push(imgPt)
-    const needed = activeTool.value === "line" ? 2 : 3
+    const needed =
+        activeTool.value === "line" || activeTool.value === "rectangle" ? 2 : 3
     if (placementPoints.value.length >= needed) {
         commitPlacement()
     }
@@ -919,6 +1090,17 @@ function cloneMeasurement(m: Measurement): Measurement {
     if (m.type === "line") {
         return { ...m, a: { ...m.a }, b: { ...m.b } }
     }
+    if (m.type === "rectangle") {
+        return {
+            ...m,
+            corners: [
+                { ...m.corners[0] },
+                { ...m.corners[1] },
+                { ...m.corners[2] },
+                { ...m.corners[3] },
+            ],
+        }
+    }
     if (m.type === "ellipse") {
         return {
             ...m,
@@ -950,6 +1132,17 @@ function applyDrag(
                 b: { x: original.b.x + dx, y: original.b.y + dy },
             }
         }
+        if (original.type === "rectangle") {
+            return {
+                ...original,
+                corners: [
+                    { x: original.corners[0].x + dx, y: original.corners[0].y + dy },
+                    { x: original.corners[1].x + dx, y: original.corners[1].y + dy },
+                    { x: original.corners[2].x + dx, y: original.corners[2].y + dy },
+                    { x: original.corners[3].x + dx, y: original.corners[3].y + dy },
+                ],
+            }
+        }
         if (original.type === "ellipse") {
             return {
                 ...original,
@@ -969,6 +1162,48 @@ function applyDrag(
         if (original.type === "line") {
             if (handleKey === "a") return { ...original, a: { x: original.a.x + dx, y: original.a.y + dy } }
             if (handleKey === "b") return { ...original, b: { x: original.b.x + dx, y: original.b.y + dy } }
+        } else if (original.type === "rectangle") {
+            // Constrain to an axis-aligned rectangle: the dragged corner
+            // follows the cursor, the diagonally-opposite corner stays put,
+            // and the two adjacent corners are recomputed from the cross of
+            // (dragged.x, opp.y) and (opp.x, dragged.y) so the shape stays
+            // rectangular. Corner indices stay stable — c0 is still the
+            // logical TL even if the box flips through itself.
+            const cornerIdx: 0 | 1 | 2 | 3 | null =
+                handleKey === "c0" ? 0 :
+                handleKey === "c1" ? 1 :
+                handleKey === "c2" ? 2 :
+                handleKey === "c3" ? 3 : null
+            if (cornerIdx !== null) {
+                const moving = {
+                    x: original.corners[cornerIdx].x + dx,
+                    y: original.corners[cornerIdx].y + dy,
+                }
+                const oppIdx = ((cornerIdx + 2) % 4) as 0 | 1 | 2 | 3
+                const opp = { ...original.corners[oppIdx] }
+                const next: [Point, Point, Point, Point] = [
+                    { x: 0, y: 0 },
+                    { x: 0, y: 0 },
+                    { x: 0, y: 0 },
+                    { x: 0, y: 0 },
+                ]
+                next[cornerIdx] = moving
+                next[oppIdx] = opp
+                if (cornerIdx === 0 || cornerIdx === 2) {
+                    // TL ↔ BR diagonal: TR=(BR.x, TL.y), BL=(TL.x, BR.y).
+                    const tl = next[0]
+                    const br = next[2]
+                    next[1] = { x: br.x, y: tl.y }
+                    next[3] = { x: tl.x, y: br.y }
+                } else {
+                    // TR ↔ BL diagonal: TL=(BL.x, TR.y), BR=(TR.x, BL.y).
+                    const tr = next[1]
+                    const bl = next[3]
+                    next[0] = { x: bl.x, y: tr.y }
+                    next[2] = { x: tr.x, y: bl.y }
+                }
+                return { ...original, corners: next }
+            }
         } else if (original.type === "ellipse") {
             if (handleKey === "center") {
                 // Dragging the ellipse center translates the whole ellipse so
@@ -1014,36 +1249,43 @@ function updateMeasurement(id: string, next: Measurement) {
     measurements.value[idx] = next
 }
 
-function pointerDown(screenX: number, screenY: number): "measurement" | "pan" {
+// Hit-test-first press handler, mirroring Konva's behaviour in the datum
+// editor: a click on an existing shape always wins over the stage's own
+// drag/pan, AND over any active placement tool. Returns "measurement" if
+// we picked up an existing measurement (caller suppresses the trailing
+// click so a placement tool doesn't commit a spurious point), "pan" if
+// the press should start a stage pan, and "placement" if the press
+// landed on empty space while a placement tool is active (caller does
+// nothing — the click event will commit the placement).
+function pointerDown(
+    screenX: number,
+    screenY: number,
+): "measurement" | "pan" | "placement" {
     const cursor = { x: screenX, y: screenY }
     const hit = hitTest(cursor)
-    if (!hit) {
-        // Empty-space click: deselect, fall through to pan behavior.
-        if (selectedId.value !== null) {
-            selectedId.value = null
-            drawOverlay()
+    if (hit) {
+        selectedId.value = hit.measurementId
+        const target = measurements.value.find((m) => m.id === hit.measurementId)
+        if (target) {
+            const mode: DragMode = hit.kind === "handle" ? "handle" : "move"
+            dragState = {
+                mode,
+                measurementId: target.id,
+                handleKey: hit.handleKey,
+                startImg: screenToImg(screenX, screenY),
+                startSnapshot: cloneMeasurement(target),
+            }
         }
-        return "pan"
-    }
-
-    selectedId.value = hit.measurementId
-    const target = measurements.value.find((m) => m.id === hit.measurementId)
-    if (!target) {
         drawOverlay()
         return "measurement"
     }
-
-    const mode: DragMode = hit.kind === "handle" ? "handle" : "move"
-    dragState = {
-        mode,
-        measurementId: target.id,
-        handleKey: hit.handleKey,
-        startImg: screenToImg(screenX, screenY),
-        startSnapshot: cloneMeasurement(target),
-        moved: false,
+    // Empty-space press.
+    if (activeTool.value !== "none") return "placement"
+    if (selectedId.value !== null) {
+        selectedId.value = null
+        drawOverlay()
     }
-    drawOverlay()
-    return "measurement"
+    return "pan"
 }
 
 function pointerMove(screenX: number, screenY: number): boolean {
@@ -1051,14 +1293,6 @@ function pointerMove(screenX: number, screenY: number): boolean {
     const nowImg = screenToImg(screenX, screenY)
     const dxImg = nowImg.x - dragState.startImg.x
     const dyImg = nowImg.y - dragState.startImg.y
-    if (!dragState.moved) {
-        // Convert image-space delta back to screen-space via viewScale; easier
-        // than tracking the original screen cursor separately.
-        const screenDx = dxImg * viewScale.value
-        const screenDy = dyImg * viewScale.value
-        if (Math.hypot(screenDx, screenDy) < DRAG_THRESHOLD_PX) return true
-        dragState.moved = true
-    }
     const next = applyDrag(
         dragState.startSnapshot,
         dragState.mode,
@@ -1093,55 +1327,94 @@ function onWheel(e: WheelEvent) {
     redraw()
 }
 
+// Once a press starts on the canvas we listen at the window level so the
+// drag survives the cursor leaving the canvas (or moving faster than the
+// browser's canvas-bound event firing). Re-attached on each press, removed
+// when the drag/pan ends.
+function attachWindowDragListeners() {
+    window.addEventListener("mousemove", onWindowMouseMove)
+    window.addEventListener("mouseup", onWindowMouseUp)
+}
+
+function detachWindowDragListeners() {
+    window.removeEventListener("mousemove", onWindowMouseMove)
+    window.removeEventListener("mouseup", onWindowMouseUp)
+}
+
+// True between an existing-measurement-grab on mousedown and the trailing
+// click event the browser will fire. Suppresses the placement-tool click
+// so grabbing a prior measurement doesn't commit a spurious new point.
+let suppressNextClick = false
+
 function onMouseDown(e: MouseEvent) {
     const { x, y } = getCanvasXY(e)
-    if (activeTool.value !== "none") {
-        // Placement tools ignore mousedown; they commit on click so a user
-        // can drag-scroll accidentally without placing a spurious point.
-        return
-    }
+    suppressNextClick = false
     const outcome = pointerDown(x, y)
-    if (outcome === "pan") {
+    if (outcome === "measurement") {
+        suppressNextClick = true
+    } else if (outcome === "pan") {
         isPanning = true
         panStart = { x: e.clientX - viewOffsetX.value, y: e.clientY - viewOffsetY.value }
     }
+    if (dragState || isPanning) attachWindowDragListeners()
 }
 
-function onMouseMove(e: MouseEvent) {
+function onWindowMouseMove(e: MouseEvent) {
     if (dragState) {
         const { x, y } = getCanvasXY(e)
         pointerMove(x, y)
         return
     }
+    if (isPanning) {
+        viewOffsetX.value = e.clientX - panStart.x
+        viewOffsetY.value = e.clientY - panStart.y
+        redraw()
+    }
+}
+
+function onWindowMouseUp() {
+    pointerUp()
+    isPanning = false
+    detachWindowDragListeners()
+}
+
+function onMouseMove(e: MouseEvent) {
+    // While a drag/pan is in flight the window listener handles motion;
+    // here we only need the placement-preview cursor.
+    if (dragState || isPanning) return
     if (activeTool.value !== "none") {
         const { x, y } = getCanvasXY(e)
         placementCursor.value = screenToImg(x, y)
         drawOverlay()
-        return
     }
-    if (!isPanning) return
-    viewOffsetX.value = e.clientX - panStart.x
-    viewOffsetY.value = e.clientY - panStart.y
-    redraw()
 }
 
 function onMouseUp() {
-    pointerUp()
-    isPanning = false
+    // Mouseup that lands inside the canvas — covered by the window listener
+    // too, but we keep this so a quick click without movement still ends
+    // cleanly even if for some reason the window handler misses.
+    if (dragState || isPanning) {
+        pointerUp()
+        isPanning = false
+        detachWindowDragListeners()
+    }
 }
 
 function onMouseLeave() {
-    pointerUp()
-    isPanning = false
+    // Don't end the drag here — the window listener takes over while the
+    // cursor is outside the canvas. Just clear the placement preview.
     placementCursor.value = null
     drawOverlay()
 }
 
 function onClick(e: MouseEvent) {
+    if (suppressNextClick) {
+        // Press picked up an existing measurement — the trailing click
+        // is part of that gesture, not a placement.
+        suppressNextClick = false
+        return
+    }
     if (activeTool.value === "none") return
-    // Guard against the click event that always follows a mousedown: if the
-    // user panned or dragged, that wasn't a placement click. Here we have no
-    // dragState at click-time because placements don't start one.
     const { x, y } = getCanvasXY(e)
     const imgPt = screenToImg(x, y)
     handlePlacementClick(imgPt)
@@ -1163,12 +1436,15 @@ function onTouchStart(e: TouchEvent) {
         isPanning = false
     } else if (e.touches.length === 1 && t0) {
         const { x, y } = getCanvasXY(t0)
-        if (activeTool.value !== "none") {
-            placementCursor.value = screenToImg(x, y)
-            return
-        }
+        // Always hit-test first so a tap on an existing handle reshapes
+        // it even when a placement tool is active.
+        suppressNextClick = false
         const outcome = pointerDown(x, y)
-        if (outcome === "pan") {
+        if (outcome === "measurement") {
+            suppressNextClick = true
+        } else if (outcome === "placement") {
+            placementCursor.value = screenToImg(x, y)
+        } else if (outcome === "pan") {
             isPanning = true
             panStart = {
                 x: t0.clientX - viewOffsetX.value,
@@ -1266,6 +1542,10 @@ const placementHint = computed<string | null>(() => {
         if (n === 0) return "Click the first endpoint."
         return "Click the second endpoint."
     }
+    if (activeTool.value === "rectangle") {
+        if (n === 0) return "Click the first corner."
+        return "Click the opposite corner."
+    }
     if (activeTool.value === "ellipse") {
         if (n === 0) return "Click the ellipse center."
         if (n === 1) return "Click the first semi-axis endpoint."
@@ -1281,7 +1561,7 @@ const measurementSummaries = computed(() => {
         id: m.id,
         type: m.type,
         typeLabel: measurementTypeLabel(m),
-        label: measurementLabel(m),
+        label: measurementSummaryValue(m),
         color: getDatumColor(m.colorIndex),
         selected: m.id === selectedId.value,
     }))
@@ -1391,6 +1671,7 @@ onMounted(() => {
 onUnmounted(() => {
     resizeObs?.disconnect()
     window.removeEventListener("keydown", onKeyDown)
+    detachWindowDragListeners()
 })
 
 watch(() => props.imageUrl, loadImg)
@@ -1454,6 +1735,30 @@ watch(() => props.scalePxPerMm, () => { drawOverlay() })
                     </svg>
                     Ellipse
                 </button>
+                <button
+                    class="inline-flex items-center gap-1.5 rounded px-2.5 py-1.5 text-xs font-medium transition-colors"
+                    :class="
+                        activeTool === 'rectangle'
+                            ? 'bg-primary/10 text-primary'
+                            : 'text-muted-foreground hover:text-foreground'
+                    "
+                    @click="setTool('rectangle')"
+                >
+                    <svg
+                        xmlns="http://www.w3.org/2000/svg"
+                        width="14"
+                        height="14"
+                        viewBox="0 0 24 24"
+                        fill="none"
+                        stroke="currentColor"
+                        stroke-width="2"
+                        stroke-linecap="round"
+                        stroke-linejoin="round"
+                    >
+                        <rect x="4" y="6" width="16" height="12" rx="1" />
+                    </svg>
+                    Rect
+                </button>
                 <button
                     class="inline-flex items-center gap-1.5 rounded px-2.5 py-1.5 text-xs font-medium transition-colors"
                     :class="

src/components/ResultViewer.vue

@@ -806,20 +806,25 @@ async function download() {
                 </CardContent>
             </Card>
 
-            <!-- Corrected image with tools -->
-            <Card>
-                <CardHeader>
-                    <CardTitle class="text-base"
-                        >Corrected Image</CardTitle
-                    >
-                </CardHeader>
-                <CardContent>
-                    <CorrectedImageViewer
-                        :image-url="resultUrl"
-                        :scale-px-per-mm="store.scalePxPerMm"
-                    />
-                </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"
+            >
+                <Card>
+                    <CardHeader>
+                        <CardTitle class="text-base"
+                            >Corrected Image</CardTitle
+                        >
+                    </CardHeader>
+                    <CardContent>
+                        <CorrectedImageViewer
+                            :image-url="resultUrl"
+                            :scale-px-per-mm="store.scalePxPerMm"
+                        />
+                    </CardContent>
+                </Card>
+            </div>
 
             <!-- Download -->
             <div class="flex flex-col items-center gap-3 pb-8">

src/components/SkwikLogo.vue

@@ -10,271 +10,14 @@ withDefaults(
 </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>
+    <span
+        class="inline-flex items-center justify-center leading-none select-none"
+        :style="{
+            width: size + 'px',
+            height: size + 'px',
+            fontSize: Math.round(size * 0.9) + 'px',
+        }"
+        aria-label="Skwik logo"
+        role="img"
+    >📐</span>
 </template>