fix: capture Device Simulator rendering via PlayModeView

[hatayama]

Refs: MasaVault 2026-07-14_シミュレーターモードでのマウスシミュレート調査.md PR-1 (To-Do 2–9)

Summary

• GameViewBridge now resolves the active Play Mode view through PlayModeView.GetMainPlayModeView() and reads m_TargetTexture from the PlayModeView declaring type, so Device Simulator (SimulatorWindow) rendering screenshots work the same as Game View.
• Screenshot unavailable-texture warnings/comments mention Game View and Device Simulator.
• Added pure unit tests for the base-type GetField pitfall plus a resolution smoke test.

User Impact

• With the Game tab set to Device Simulator in Play Mode, uloop screenshot --capture-mode rendering (including --annotate-elements) returns a PNG again, so the annotate → simulate-mouse-ui click flow unblocks.

Test plan

• dist/darwin-arm64/uloop compile → 0 errors / 0 warnings
• GameViewBridgeTests + EditorWindowCaptureUtilityTests EditMode → passed
• Simulator + Play Mode (SimulateMouseDemoScene): rendering screenshot, annotate-elements, click ClickButton1 → [Demo] Clicked 'ClickButton1'
• Normal Game View regression: same three steps succeed
• Simulator Fit to Screen / Scale / portrait rotation / Safe Area ON: annotate → click still hits
• GHA: not applicable on this PR — base is the umbrella branch feature/simulator-view-support (workflows only run for main / v3-beta). Full GHA runs on the final umbrella → v3-beta PR. Quality here is local verification + review.

Notes

• Full EditMode run: 2030 passed, 2 failed in unrelated suites (RunTestsTestFrameworkResultTests, StaticFacadeStateGuardTests); not caused by this change.
• Fit/Scale/Safe Area are chrome-only; input coordinates stay in game-resolution space. Portrait rotation changes Screen size — re-annotate after rotating (verified).

[coderabbitai]

📝 Walkthrough

Walkthrough

GameViewBridge now obtains the Play Mode view’s RenderTexture through PlayModeView reflection. New editor tests cover private field resolution, while screenshot comments and messages use Play Mode view terminology.

Changes

Play Mode capture

Layer / File(s)	Summary
PlayModeView reflection bridge Packages/src/Editor/InternalAPIBridge/...	GameViewBridge resolves PlayModeView.GetMainPlayModeView() and reads m_TargetTexture; friend-assembly access is added for editor tests.
Reflection behavior tests Assets/Tests/Editor/GameViewBridgeTests.cs	Tests cover declaring-type field lookup, derived-type private-field behavior, and successful render-texture retrieval.
Capture messaging and documentation Packages/src/Editor/FirstPartyTools/Screenshot/...	Capture comments and messages now refer to the Play Mode view and its RenderTexture.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Sequence Diagram(s)

sequenceDiagram
  participant ScreenshotCapture
  participant GameViewBridge
  participant PlayModeView
  ScreenshotCapture->>GameViewBridge: Request render texture
  GameViewBridge->>PlayModeView: Invoke GetMainPlayModeView
  PlayModeView-->>GameViewBridge: Return main Play Mode view
  GameViewBridge->>PlayModeView: Read m_TargetTexture
  PlayModeView-->>GameViewBridge: Return RenderTexture
  GameViewBridge-->>ScreenshotCapture: Return RenderTexture or null

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Possibly related PRs

• hatayama/unity-cli-loop#1232: Changes friend-assembly access in AssemblyInfo.cs, which is also updated here for editor tests.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%.	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 summarizes the main change: capturing Device Simulator rendering via PlayModeView.
Description check	✅ Passed	The description is directly related to the changes and accurately describes the PlayModeView rendering fix and tests.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/gameview-bridge-playmodeview

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