fix(desktop): let every CEF first responder own the paste hotkey

[banozz0]

Complements the renderer-edit CEF passthrough (7a70ed4) by widening it from Source/Manage/SessionChat to every CEF first responder.

Why

shell_focus keeps naming a terminal pane while an app modal, the sidebar, a Kanban/Automate page, a titlebar popup, a browser tab, or the editor companion holds AppKit's first responder — so the app-wide Cmd+V binding still resolves a hidden terminal and pastes the same clipboard into its composer alongside the CEF view's own paste. The next chat send's draft-preservation step then sweeps that phantom composer draft into Saved Prompts as a prompt the user never saved.

We hit this in the wild today: image pastes into session chat were written to disk twice ~45ms apart (native terminal path first, chat composer second) and the terminal copy surfaced as an untagged Saved Prompt after the send. 7a70ed4 fixes the chat/Docs/Source cases; this covers the remaining Chromium surfaces, which shadow-paste through exactly the same mechanism. A Chromium first responder always owns its own paste, so the enumeration doesn't need to grow case by case.

cargo check clean (no new warnings in focus.rs).

🤖 Generated with Claude Code

Summary by CodeRabbit

• Bug Fixes
  • Fixed macOS paste handling across embedded browser surfaces.
  • Prevented clipboard content from being unintentionally pasted into hidden terminal input when dialogs, sidebars, popups, or browser tabs are active.

[coderabbitai]

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 6636828f-636a-4ca0-b91f-642a2d17bce2

📥 Commits

Reviewing files that changed from the base of the PR and between 8818ac5 and 2cae150.

📒 Files selected for processing (1)

• apps/desktop/src/app/focus.rs

Included review availability: Your plan provides up to 4 included reviews per hour; 3 remain after this review.

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📝 Walkthrough

Walkthrough

The macOS renderer edit hotkey passthrough now treats every CefSurface as owning native focus. The existing non-macOS fallback and propagation behavior remain unchanged.

Changes

CEF Paste Focus Handling

Layer / File(s)	Summary
Broaden the CEF focus gate apps/desktop/src/app/focus.rs	The macOS match now accepts any CefSurface. The comment documents modal, sidebar, Kanban, titlebar popup, and browser-tab cases. Non-macOS behavior is unchanged.

Estimated code review effort: 2 (Simple) | ~5 minutes

Merge Risk: ⚪ Minimal · up to 2cae1

This change routes Cmd+V to the visible CEF view instead of a hidden terminal composer, preventing duplicate pastes and unintended saved drafts. No actionable merge-blocking risk remains beyond normal checks and review.

Suggested reviewers: maddada

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 1 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: allowing every CEF first responder to own the paste hotkey.
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.

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✨ Finishing Touches 💡 1

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• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/cef-first-responder-paste-passthrough

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