fix(web): face editor respects detail panel bounds and preserves position on resize

web/src/lib/components/asset-viewer/asset-viewer.svelte

@@ -487,8 +487,6 @@
   class="fixed start-0 top-0 grid size-full grid-cols-4 grid-rows-[64px_1fr] overflow-hidden bg-black"
   use:focusTrap
   bind:this={assetViewerHtmlElement}
-  bind:clientWidth={containerWidth}
-  bind:clientHeight={containerHeight}
 >
   <!-- Top navigation bar -->
   {#if $slideshowState === SlideshowState.None && !assetViewerManager.isShowEditor}
@@ -530,7 +528,12 @@
   {/if}
 
   <!-- Asset Viewer -->
-  <div data-viewer-content class="z-[-1] relative col-start-1 col-span-4 row-start-1 row-span-full">
+  <div
+    data-viewer-content
+    class="z-[-1] relative col-start-1 col-span-4 row-start-1 row-span-full"
+    bind:clientWidth={containerWidth}
+    bind:clientHeight={containerHeight}
+  >
     {#if viewerKind === 'StackVideoViewer'}
       <VideoViewer
         asset={previewStackedAsset!}

web/src/lib/components/asset-viewer/face-editor/face-editor.svelte

@@ -31,6 +31,10 @@
 
   let searchTerm = $state('');
   let faceBoxPosition = $state({ left: 0, top: 0, width: 0, height: 0 });
+  let initialized = false;
+  let previousContentWidth = 0;
+  let previousOffsetX = 0;
+  let previousOffsetY = 0;
 
   let filteredCandidates = $derived(
     searchTerm
@@ -94,27 +98,49 @@
   });
 
   $effect(() => {
-    const { offsetX, offsetY } = imageContentMetrics;
+    const { offsetX, offsetY, contentWidth } = imageContentMetrics;
 
-    if (!canvas) {
+    if (!canvas || contentWidth === 0) {
       return;
     }
 
-    canvas.setDimensions({
-      width: containerWidth,
-      height: containerHeight,
-    });
+    if (!initialized) {
+      initialized = true;
+      canvas.setDimensions({ width: containerWidth, height: containerHeight });
 
-    if (!faceRect) {
+      if (faceRect) {
+        faceRect.set({ top: offsetY + 200, left: offsetX + 200 });
+        faceRect.setCoords();
+      }
+
+      previousContentWidth = contentWidth;
+      previousOffsetX = offsetX;
+      previousOffsetY = offsetY;
+      positionFaceSelector();
       return;
     }
 
-    faceRect.set({
-      top: offsetY + 200,
-      left: offsetX + 200,
-    });
+    canvas.setDimensions({ width: containerWidth, height: containerHeight });
 
-    faceRect.setCoords();
+    if (faceRect && previousContentWidth > 0) {
+      const scale = contentWidth / previousContentWidth;
+      const imageRelLeft = (faceRect.left - previousOffsetX) * scale;
+      const imageRelTop = (faceRect.top - previousOffsetY) * scale;
+
+      faceRect.set({
+        left: offsetX + imageRelLeft,
+        top: offsetY + imageRelTop,
+        scaleX: faceRect.scaleX * scale,
+        scaleY: faceRect.scaleY * scale,
+      });
+      faceRect.setCoords();
+    }
+
+    previousContentWidth = contentWidth;
+    previousOffsetX = offsetX;
+    previousOffsetY = offsetY;
+
+    canvas.renderAll();
     positionFaceSelector();
   });