diff --git a/.changeset/fix-preview-scaling.md b/.changeset/fix-preview-scaling.md
new file mode 100644
index 00000000..c22c744b
--- /dev/null
+++ b/.changeset/fix-preview-scaling.md
@@ -0,0 +1,5 @@
+---
+'@open-codesign/desktop': patch
+---
+
+Preserve preview artboard scroll bounds at scaled zoom levels to prevent desktop and tablet previews from being clipped.
diff --git a/.github/workflows/codex-pr-review.yml b/.github/workflows/codex-pr-review.yml
index 5d8b7c28..918a261f 100644
--- a/.github/workflows/codex-pr-review.yml
+++ b/.github/workflows/codex-pr-review.yml
@@ -121,6 +121,11 @@ jobs:
           [ -n "$effort" ] || effort="$DEFAULT_EFFORT"
           [ -n "$effort" ] || effort='high'
 
+          fallback_model="$DEFAULT_MODEL"
+          [ -n "$fallback_model" ] || fallback_model='gpt-5.4'
+          fallback_effort="$DEFAULT_EFFORT"
+          [ -n "$fallback_effort" ] || fallback_effort='high'
+
           is_deepseek='false'
           case "$base_url" in
             *api.deepseek.com*)
@@ -134,6 +139,10 @@ jobs:
             echo "model=$model"
             echo "effort=$effort"
             echo "is_deepseek=$is_deepseek"
+            echo "fallback_api_key=$DEFAULT_API_KEY"
+            echo "fallback_base_url=$DEFAULT_BASE_URL"
+            echo "fallback_model=$fallback_model"
+            echo "fallback_effort=$fallback_effort"
           } >> "$GITHUB_OUTPUT"
 
       - name: Set up Node.js for DeepSeek review
@@ -143,7 +152,9 @@ jobs:
           node-version: "20"
 
       - name: Run DeepSeek for PR Review
+        id: run_deepseek
         if: steps.check_bot.outputs.has_review_for_current_head != 'true' && steps.review_config.outputs.is_deepseek == 'true'
+        continue-on-error: true
         env:
           GH_TOKEN: ${{ github.token }}
           GITHUB_TOKEN: ${{ github.token }}
@@ -159,7 +170,7 @@ jobs:
 
       - name: Run Codex for PR Review
         id: run_codex
-        if: steps.check_bot.outputs.has_review_for_current_head != 'true' && steps.review_config.outputs.is_deepseek != 'true'
+        if: always() && steps.check_bot.outputs.has_review_for_current_head != 'true' && (steps.review_config.outputs.is_deepseek != 'true' || steps.run_deepseek.outcome == 'failure')
         uses: openai/codex-action@e0fdf01220eb9a88167c4898839d273e3f2609d1 # v1
         env:
           GH_TOKEN: ${{ github.token }}
@@ -169,10 +180,10 @@ jobs:
           LATEST_BOT_REVIEW_COMMIT: ${{ steps.check_bot.outputs.latest_bot_review_commit }}
           IS_FOLLOW_UP_REVIEW: ${{ steps.check_bot.outputs.is_follow_up_review }}
         with:
-          openai-api-key: ${{ steps.review_config.outputs.api_key }}
-          responses-api-endpoint: ${{ steps.review_config.outputs.base_url }}
-          model: ${{ steps.review_config.outputs.model }}
-          effort: ${{ steps.review_config.outputs.effort }}
+          openai-api-key: ${{ steps.review_config.outputs.fallback_api_key }}
+          responses-api-endpoint: ${{ steps.review_config.outputs.fallback_base_url }}
+          model: ${{ steps.review_config.outputs.fallback_model }}
+          effort: ${{ steps.review_config.outputs.fallback_effort }}
           sandbox: danger-full-access
           safety-strategy: drop-sudo
           prompt-file: .github/prompts/codex-pr-review.md
diff --git a/apps/desktop/src/renderer/src/components/PreviewPane.test.ts b/apps/desktop/src/renderer/src/components/PreviewPane.test.ts
index b433f7b1..d2ec2ad3 100644
--- a/apps/desktop/src/renderer/src/components/PreviewPane.test.ts
+++ b/apps/desktop/src/renderer/src/components/PreviewPane.test.ts
@@ -13,6 +13,7 @@ import {
   previewArtboardStyle,
   previewPaneLayoutClasses,
   previewViewportDimensions,
+  scaledPreviewFrameStyle,
   scaleRectForZoom,
   stablePreviewSourceKey,
 } from './PreviewPane';
@@ -116,6 +117,15 @@ describe('preview artboard frame', () => {
       }),
     ).toBe(100);
   });
+
+  it('preserves scaled desktop dimensions as minimum scroll bounds', () => {
+    expect(scaledPreviewFrameStyle('desktop', 150)).toEqual({
+      width: '2160px',
+      height: '1350px',
+      minWidth: '2160px',
+      minHeight: '1350px',
+    });
+  });
 });
 
 describe('preview pane welcome state', () => {
diff --git a/apps/desktop/src/renderer/src/components/PreviewPane.tsx b/apps/desktop/src/renderer/src/components/PreviewPane.tsx
index a7125b39..0fe12b1e 100644
--- a/apps/desktop/src/renderer/src/components/PreviewPane.tsx
+++ b/apps/desktop/src/renderer/src/components/PreviewPane.tsx
@@ -167,6 +167,18 @@ export function previewArtboardFrameClass(): string {
   return ARTBOARD_FRAME_CLASS;
 }
 
+export function scaledPreviewFrameStyle(
+  viewport: PreviewSlotProps['viewport'],
+  zoom: number,
+): CSSProperties {
+  const frame = previewViewportDimensions(viewport);
+  const scale = zoom / 100;
+  const width = `${Math.round(frame.width * scale)}px`;
+  const height = `${Math.round(frame.height * scale)}px`;
+
+  return { width, height, minWidth: width, minHeight: height };
+}
+
 function ScaledPreviewFrame({
   viewport,
   zoom,
@@ -179,13 +191,7 @@ function ScaledPreviewFrame({
   const frame = previewViewportDimensions(viewport);
   const scale = zoom / 100;
   return (
-    <div
-      className="relative flex-shrink-0"
-      style={{
-        width: `${frame.width * scale}px`,
-        height: `${frame.height * scale}px`,
-      }}
-    >
+    <div className="relative flex-shrink-0" style={scaledPreviewFrameStyle(viewport, zoom)}>
       <div
         className="origin-top-left"
         style={{