feat(web): control Android foldables in the Device panel

[juliusmarminge]

Android foldable emulators already stream in the Device panel, but the panel could not change their posture or show the hinge moving.

Expose Device Hub 0.12's fold endpoint through the device proxy with read access for posture and operate access for changes. Show Fold and Unfold controls only when the emulator reports support. An original procedural 3D foldable has two bevelled metal halves joined at a hinge, one continuous inner screen, a live cover display set in black glass on the back of the moving half, matte back glass with a camera bar (three lenses and a flash) on the fixed half, side keys, and a rounded hinge spine that turns with the fold. The controls animate it immediately while the emulator changes posture. The viewer and last frame remain mounted through Android's encoder restart, and the live frame moves between the inner and cover screens.

Verification

• Pixel 10 Pro Fold emulator in the web Device panel: folded to 0°, unfolded to 180°, watched both hinge transitions and screen changes in the same 3D canvas, and orbited to check the edges, back glass and camera bar.
• Focused fold scene and viewer tests: 14 passed. Targeted lint and client-runtime TypeScript checks passed.
• React Doctor scanned the changed components; its only finding is the existing complexity of DeviceStreamView.

Visual evidence

Before: flat slab, no back detail

After: unfolded, front

After: unfolded, back with camera bar and cover display

After: folded, live cover screen and hinge spine

Fold and unfold motion

https://gh-file-drop-api-prod-mi5fy3sowv63ufte.pinglabs.workers.dev/f/3724d86070704f79/fold-motion.mp4

Model: GPT-6, then Claude Opus 5.5 (model detail pass). Harness: Codex, Claude Code.

🤖 Generated with Claude Code

Summary by CodeRabbit

• New Features
  • Supported Android foldable devices can now be folded and unfolded from controls beside the device view.
  • The 3D device model animates between fold angles and updates the displayed screen to match the device’s posture.
  • Fold controls show the current state and provide feedback when a request fails or the device is unavailable.
• Bug Fixes
  • The device view stays visible while Android reconnects, with a waiting notice if video has not returned after a short delay.

[macroscopeapp]

Approvability

Verdict: Not approved

Macroscope's review found this PR not approvable — This PR adds a substantial Android foldable capability across the authenticated device proxy, production web controls, stream-reconnect behavior, and a new 3D rendering scene. The mutating device-control endpoint and broad runtime surface warrant human review.

^{You can add or adjust custom eligibility rules. Learn more.}

[github-actions]

Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	13.5 KiB	13.5 KiB	−51 B (−0.4%)	15.1 KiB	✅
Codex	Thread snapshot wire	7.1 KiB	7.1 KiB	−3 B (−0.0%)	7.3 KiB	✅
Codex	Live turn WebSocket wire	6.5 KiB	6.4 KiB	−48 B (−0.7%)	7.8 KiB	✅
Codex	Live turn WebSocket decoded	56.3 KiB	56.2 KiB	−44 B (−0.1%)	66.4 KiB	✅
Codex	Live turn messages	10	9	−1 (−10.0%)	21	✅
Claude	Total thread wire	13.5 KiB	13.5 KiB	+6 B (+0.0%)	15.1 KiB	✅
Claude	Thread snapshot wire	7.1 KiB	7.1 KiB	+1 B (+0.0%)	7.3 KiB	✅
Claude	Live turn WebSocket wire	6.4 KiB	6.4 KiB	+5 B (+0.1%)	7.8 KiB	✅
Claude	Live turn WebSocket decoded	57.0 KiB	57.0 KiB	0 B (0.0%)	66.4 KiB	✅
Claude	Live turn messages	9	9	0 (0.0%)	21	✅

Baseline: d23eab1 · PR result: 8399a31 · Source CI: success

Scenario and decoded snapshot size

10 historical turns, 5 command tools per turn, 878.9 KiB retained MCP result per historical turn, and a 1.05 MiB retained result in the measured turn.

• Codex decoded thread snapshot: 114.0 KiB
• Claude decoded thread snapshot: 114.7 KiB

Updated in place by a trusted workflow. PR artifacts are strictly validated and never executed.

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📝 Walkthrough

Walkthrough

The change adds Android fold-state reads and posture updates through the device hub. The web interface displays fold and unfold controls for supported Android devices. The proxy applies access rules to fold requests. The phone viewer renders and animates foldable-device scenes, while the device view retains qualifying Android frames during connection.

Changes

Android Fold Support

Layer / File(s)	Summary
Fold endpoint proxy access apps/server/src/device/DeviceHubProxy.ts, apps/server/src/device/DeviceHubProxy.test.ts	The proxy allows requests to the fold endpoint. Mutating requests require operate scope. Tests cover read access, denied read-scope POST requests, and permitted operate-scope POST requests.
Fold requests, controls, and device view integration apps/web/src/components/device/deviceFold.ts, apps/web/src/components/device/DeviceAndroidFoldControls.tsx, apps/web/src/components/device/DeviceStreamView.tsx, apps/web/src/components/device/DevicePhoneViewport.tsx, docs/user/devices.md	The web client validates fold-state responses and provides functions to read fold state and submit a posture. Controls retry failed reads and submit fold or unfold requests with a timeout. The device view renders Android fold controls, passes fold angle to the phone viewport, and retains qualifying Android frames. The device guide describes the controls.
Foldable scene and phone viewer packages/client-runtime/src/device/androidFoldScene.ts, packages/client-runtime/src/device/androidFoldScene.test.ts, packages/client-runtime/src/device/phoneViewer.ts, packages/client-runtime/src/device/phoneViewer.test.ts	The fold scene provides device geometry, display visibility, and touch-coordinate mapping. The phone viewer creates fold scenes and animates fold-angle changes. Tests cover scene geometry, touch mapping, animation, retargeting, and scene replacement.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant DeviceAndroidFoldControls
  participant deviceFold
  participant DeviceHubProxy
  participant AndroidHub
  DeviceAndroidFoldControls->>deviceFold: Read fold state or submit posture
  deviceFold->>DeviceHubProxy: Send GET or POST request
  DeviceHubProxy->>AndroidHub: Forward authorized request
  AndroidHub-->>DeviceHubProxy: Return fold response
  DeviceHubProxy-->>deviceFold: Return response
  deviceFold-->>DeviceAndroidFoldControls: Provide validated fold state

Loading

Merge Risk: 🟡 Moderate · up to e7b74

A posture update can remove a loaded device model and leave viewer resources unreleased. Fix the model transition before merging.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 55.56% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 9 functions across 10 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly and concisely identifies the main change: adding Android foldable controls to the Device panel.
Description check	✅ Passed	The description explains the problem, implementation, UI behavior, visual changes, verification steps, and test results. It includes screenshots and a video for the UI and animation changes. The requi…

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Actionable comments posted: 2

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Inline comments:
In `@apps/web/src/components/device/DeviceAndroidFoldControls.tsx`:
- Around line 43-45: Update the fold-state read failure handler so it preserves
the last valid fold state instead of clearing it, and schedules a retry while
the view remains visible and enabled. Keep the retry cancellable through the
existing controller signal so stale reads do not update an unmounted or disabled
view.
- Line 64: Update the setAndroidFold request flow to accept and pass an
AbortSignal, and abort it after a timeout so a stalled POST settles; ensure the
component’s pending state is cleared when the request times out so the posture
buttons recover.

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📒 Files selected for processing (6)

• apps/server/src/device/DeviceHubProxy.test.ts
• apps/server/src/device/DeviceHubProxy.ts
• apps/web/src/components/device/DeviceAndroidFoldControls.tsx
• apps/web/src/components/device/DeviceStreamView.tsx
• apps/web/src/components/device/deviceFold.ts
• docs/user/devices.md

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Inline comments:
In `@apps/web/src/components/device/DeviceStreamView.tsx`:
- Around line 189-193: Update the `retainingAndroidFrame` logic in
`DeviceStreamView` so an Android restart in the connecting state does not hide
the reconnection indicator indefinitely; retain the previous frame only for a
shorter bounded restart period or show a visible reconnection state while
connecting.

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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
In `@packages/client-runtime/src/device/phoneViewer.ts`:
- Around line 331-343: Update the fold-angle handling so a non-null angle never
replaces an imported scene: store the angle and return while `imported` is set.
Create an Android fold scene only when no model is imported and the profile is
Android; preserve the existing scene for imported models and the current
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📒 Files selected for processing (7)

• apps/web/src/components/device/DeviceAndroidFoldControls.tsx
• apps/web/src/components/device/DevicePhoneViewport.tsx
• apps/web/src/components/device/DeviceStreamView.tsx
• packages/client-runtime/src/device/androidFoldScene.test.ts
• packages/client-runtime/src/device/androidFoldScene.ts
• packages/client-runtime/src/device/phoneViewer.test.ts
• packages/client-runtime/src/device/phoneViewer.ts

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