feat(cli): coordinate-frame layout findings in check

docs/packages/cli.mdx

@@ -532,7 +532,7 @@ Word-level transcripts (whisper output) are grouped into readable caption cues o
     npx hyperframes check [dir] --strict       # exit non-zero on warnings too
     ```
 
-    `check` runs the linter first (browser skipped entirely on lint errors), then loads the bundled composition once and sweeps one seek grid running every audit per sample: runtime console errors and failed requests, layout defects (overflow, clipping, held overlaps, occlusion), `*.motion.json` sidecar assertions, and WCAG AA contrast.
+    `check` runs the linter first (browser skipped entirely on lint errors), then loads the bundled composition once and sweeps one seek grid running every audit per sample: runtime console errors and failed requests, layout defects (overflow, clipping, held overlaps, occlusion, coordinate-frame drift), `*.motion.json` sidecar assertions, and WCAG AA contrast.
 
     | Flag | Description |
     |------|-------------|

packages/cli/src/commands/layout-audit.browser.js

@@ -841,6 +841,255 @@
     };
   }
 
+  // Attachment allowance: callouts/tooltips legitimately hang near (not inside) their anchor.
+  const ESCAPE_INTERSECTION_FRACTION = 0.3;
+  const ESCAPE_MIN_CHILD_AREA = 2500;
+
+  function edgeGap(child, parent) {
+    const dx = Math.max(parent.left - child.right, 0, child.left - parent.right);
+    const dy = Math.max(parent.top - child.bottom, 0, child.top - parent.bottom);
+    return Math.sqrt(dx * dx + dy * dy);
+  }
+
+  // An absolute element rendering far outside its offset parent was positioned in the wrong frame.
+  function escapedContainerIssues(root, time) {
+    const issues = [];
+    const flagged = new Set();
+    for (const element of Array.from(root.querySelectorAll("*"))) {
+      if (!isVisibleElement(element) || hasAllowOverflowFlag(element)) continue;
+      if (getComputedStyle(element).position !== "absolute") continue;
+      const parent = element.offsetParent;
+      if (!parent || parent === document.body || parent === root || !isVisibleElement(parent)) {
+        continue;
+      }
+      const childRect = toRect(element.getBoundingClientRect());
+      if (rectArea(childRect) < ESCAPE_MIN_CHILD_AREA) continue;
+      const parentRect = toRect(parent.getBoundingClientRect());
+      const visible = intersectionArea(childRect, parentRect);
+      if (visible >= rectArea(childRect) * ESCAPE_INTERSECTION_FRACTION) continue;
+      // Fully detached but hugging the parent = a callout/tooltip; touching yet mostly outside = drift.
+      const allowance = Math.max(48, Math.min(childRect.width, childRect.height) / 2);
+      if (visible <= 0 && edgeGap(childRect, parentRect) <= allowance) continue;
+      flagged.add(element);
+      issues.push({
+        code: "escaped_container",
+        severity: "warning",
+        time,
+        selector: selectorFor(element),
+        containerSelector: selectorFor(parent),
+        text: textContentFor(element),
+        message:
+          "Positioned element renders far outside its offset parent — its coordinates were likely computed in a different frame (canvas/viewport pixels).",
+        rect: childRect,
+        containerRect: parentRect,
+        fixHint:
+          "Compute left/top in the offset parent's frame (subtract its rect), or mark intentional placement with data-layout-allow-overflow.",
+      });
+    }
+    return { issues, flagged };
+  }
+
+  // A gradient reads as content when any stop is solid; all-translucent stops are glows/vignettes.
+  function gradientHasOpaqueStop(image) {
+    const colors = image.match(/rgba?\([^)]+\)|#[0-9a-f]{3,8}|\btransparent\b/gi) || [];
+    return colors.some((color) => !/^transparent$/i.test(color) && colorAlpha(color) >= 0.6);
+  }
+
+  function isPaintedPanel(element) {
+    if (FRAME_MEDIA_TAGS.has(element.tagName.toUpperCase())) return false;
+    const style = getComputedStyle(element);
+    const image = style.backgroundImage || "none";
+    if (image.includes("url(")) return true;
+    if (image !== "none" && gradientHasOpaqueStop(image)) return true;
+    if (!isTransparentColor(style.backgroundColor) && colorAlpha(style.backgroundColor) > 0.05) {
+      return true;
+    }
+    return (
+      parsePx(style.borderTopWidth) +
+        parsePx(style.borderRightWidth) +
+        parsePx(style.borderBottomWidth) +
+        parsePx(style.borderLeftWidth) >
+      0
+    );
+  }
+
+  // Canvas-breach floor: entrance nudges stay quiet; matches the connector threshold scale.
+  const PANEL_BREACH_FLOOR_PX = 24;
+  const PANEL_BREACH_FLOOR_FRACTION = 0.025;
+  // A hero-sized panel stuck on the edge is drift; a small painted bleed is usually decoration.
+  const PANEL_HERO_AREA_FRACTION = 0.1;
+
+  // Painted panels breaching the canvas: text is canvas_overflow's, media is frame_out_of_frame's, panels were nobody's.
+  function panelOutOfCanvasIssues(root, rootRect, time, tolerance, escapedElements) {
+    const issues = [];
+    const floor = Math.max(
+      PANEL_BREACH_FLOOR_PX,
+      Math.min(rootRect.width, rootRect.height) * PANEL_BREACH_FLOOR_FRACTION,
+    );
+    const rootArea = rectArea(rootRect);
+    const flagged = new Set();
+    for (const element of Array.from(root.querySelectorAll("*"))) {
+      if (!isVisibleElement(element) || hasAllowOverflowFlag(element)) continue;
+      if (escapedElements.has(element)) continue;
+      // Ownership is geometric and strict-mutex: any text breach past canvas_overflow's own
+      // tolerance cedes the element to canvas_overflow; in-bounds text leaves the panel finding.
+      if (hasOwnTextCandidate(element)) {
+        const textRect = textRectFor(element);
+        if (textRect && overflowFor(textRect, rootRect, tolerance)) continue;
+      }
+      const rect = toRect(element.getBoundingClientRect());
+      if (rectArea(rect) >= rootArea * 0.95) continue;
+      // Fully off-canvas paints nothing — that is a parked entrance, not drift.
+      if (intersectionArea(rect, rootRect) <= 0) continue;
+      const overflow = overflowFor(rect, rootRect, floor);
+      if (!overflow || !isPaintedPanel(element)) continue;
+      if (element.parentElement && flagged.has(element.parentElement)) {
+        flagged.add(element);
+        continue;
+      }
+      flagged.add(element);
+      issues.push({
+        code: "panel_out_of_canvas",
+        severity: rectArea(rect) >= rootArea * PANEL_HERO_AREA_FRACTION ? "warning" : "info",
+        time,
+        selector: selectorFor(element),
+        containerSelector: selectorFor(root),
+        text: textContentFor(element).slice(0, 48),
+        message: "Painted panel extends outside the composition canvas.",
+        rect,
+        containerRect: rootRect,
+        overflow,
+        fixHint:
+          "Move the panel inward, or mark intentional off-canvas animation with data-layout-allow-overflow.",
+      });
+    }
+    return issues;
+  }
+
+  const CONNECTOR_NAME = /\b(conn(ector)?|arrow|edge|link|flow|wire)\b/i;
+  const CONNECTOR_SKIP_CONTAINERS = "defs, marker, clipPath, mask, symbol, pattern";
+
+  function connectorNameFor(element) {
+    const className =
+      typeof element.className === "string" ? element.className : element.className.baseVal || "";
+    return `${element.id || ""} ${className}`;
+  }
+
+  // Screen-space endpoints via the browser: getScreenCTM covers viewBox, preserveAspectRatio and group transforms.
+  function pathScreenEndpoints(svg, path) {
+    if (
+      typeof path.getTotalLength !== "function" ||
+      typeof path.getPointAtLength !== "function" ||
+      typeof path.getScreenCTM !== "function" ||
+      typeof svg.createSVGPoint !== "function"
+    ) {
+      return null;
+    }
+    let total;
+    try {
+      total = path.getTotalLength();
+    } catch {
+      return null;
+    }
+    if (!Number.isFinite(total) || total <= 0) return null;
+    const matrix = path.getScreenCTM();
+    if (!matrix) return null;
+    const toScreen = (local) => {
+      const point = svg.createSVGPoint();
+      point.x = local.x;
+      point.y = local.y;
+      const mapped = point.matrixTransform(matrix);
+      return { x: mapped.x, y: mapped.y };
+    };
+    return {
+      start: toScreen(path.getPointAtLength(0)),
+      end: toScreen(path.getPointAtLength(total)),
+    };
+  }
+
+  function distanceToRect(point, rect) {
+    const dx = Math.max(rect.left - point.x, 0, point.x - rect.right);
+    const dy = Math.max(rect.top - point.y, 0, point.y - rect.bottom);
+    return Math.sqrt(dx * dx + dy * dy);
+  }
+
+  // Solid, compact elements a connector could plausibly anchor to.
+  function connectorAnchorRects(root, rootRect) {
+    const compact = [];
+    const painted = [];
+    const rootArea = rectArea(rootRect);
+    for (const element of Array.from(root.querySelectorAll("*"))) {
+      // Known blind spot: anchors living inside an SVG (<image>, foreignObject) are not counted.
+      if (element.closest("svg") || !isVisibleElement(element)) continue;
+      const opaque =
+        RASTER_TAGS.has(element.tagName) || hasOpaqueBackground(getComputedStyle(element));
+      if (!opaque && !textContentFor(element)) continue;
+      const rect = toRect(element.getBoundingClientRect());
+      const area = rectArea(rect);
+      if (area < 400) continue;
+      // Containment tier: large opaque targets only — a text-bearing wrapper contains its own diagram's endpoints.
+      if (opaque && area <= rootArea * 0.6) painted.push({ rect, element });
+      if (area <= rootArea * 0.15) compact.push(rect);
+    }
+    return { compact, painted };
+  }
+
+  function isConnectorPath(svg, path) {
+    if (path.hasAttribute("marker-start") || path.hasAttribute("marker-end")) return true;
+    return (
+      CONNECTOR_NAME.test(connectorNameFor(svg)) || CONNECTOR_NAME.test(connectorNameFor(path))
+    );
+  }
+
+  // A connector whose BOTH endpoints land far from every anchorable element was drawn in the wrong frame.
+  // min over the two endpoints is intentional: a half-attached connector is a design choice, not frame drift.
+  function connectorDetachmentIssues(root, rootRect, time) {
+    const issues = [];
+    let anchors = null;
+    const threshold = Math.max(32, Math.min(rootRect.width, rootRect.height) * 0.02);
+    for (const svg of Array.from(root.querySelectorAll("svg"))) {
+      if (!isVisibleElement(svg) || hasAllowOverflowFlag(svg)) continue;
+      for (const path of Array.from(svg.querySelectorAll("path"))) {
+        if (path.closest(CONNECTOR_SKIP_CONTAINERS)) continue;
+        if (!isConnectorPath(svg, path)) continue;
+        const endpoints = pathScreenEndpoints(svg, path);
+        if (!endpoints) continue;
+        if (anchors === null) anchors = connectorAnchorRects(root, rootRect);
+        if (anchors.compact.length < 2) return issues;
+        const attached = (point) =>
+          anchors.painted.some(
+            (anchor) => !anchor.element.contains(svg) && distanceToRect(point, anchor.rect) === 0,
+          ) || anchors.compact.some((rect) => distanceToRect(point, rect) <= threshold);
+        if (attached(endpoints.start) || attached(endpoints.end)) continue;
+        const gap = Math.round(
+          Math.min(
+            Math.min(...anchors.compact.map((rect) => distanceToRect(endpoints.start, rect))),
+            Math.min(...anchors.compact.map((rect) => distanceToRect(endpoints.end, rect))),
+          ),
+        );
+        issues.push({
+          code: "connector_detached",
+          severity: "warning",
+          time,
+          selector: selectorFor(path),
+          containerSelector: selectorFor(svg),
+          message: `Connector path endpoints are ${gap}px from the nearest anchorable element — measured coordinates were likely drawn into an SVG with a different origin.`,
+          rect: toRect({
+            left: Math.min(endpoints.start.x, endpoints.end.x),
+            top: Math.min(endpoints.start.y, endpoints.end.y),
+            right: Math.max(endpoints.start.x, endpoints.end.x),
+            bottom: Math.max(endpoints.start.y, endpoints.end.y),
+            width: Math.abs(endpoints.end.x - endpoints.start.x),
+            height: Math.abs(endpoints.end.y - endpoints.start.y),
+          }),
+          fixHint:
+            "Subtract the SVG's own rect when converting measured coordinates, and keep the SVG a direct child of the stage.",
+        });
+      }
+    }
+    return issues;
+  }
+
   function candidateAnchor(element) {
     const dataAttributes = {};
     for (const attribute of Array.from(element.attributes)) {
@@ -932,6 +1181,10 @@
 
     issues.push(...containerOverflowIssues(root, time, tolerance));
     issues.push(...contentOverlapIssues(root, time));
+    const escaped = escapedContainerIssues(root, time);
+    issues.push(...escaped.issues);
+    issues.push(...panelOutOfCanvasIssues(root, rootRect, time, tolerance, escaped.flagged));
+    issues.push(...connectorDetachmentIssues(root, rootRect, time));
     return issues;
   };