fix(desktop): reopen the main window from the File menu

[angusm73]

What Changed

Adds File → New Window with ⌘N on macOS and Ctrl+N on Windows/Linux. Reuses the existing window activation behavior to reopen the main window, or restore and focus it when already open.

Why

Addresses the macOS window-reopening problem reported in #435 (already closed).

After closing the main window with ⌘W on macOS, the File menu offers no way to reopen it. This adds the expected menu command and shortcut while preserving the existing single-window and backend-readiness behavior.

Validation

• All 34 focused desktop menu/window tests passed; targeted lint, formatting, and desktop typecheck passed.
• Tested in an isolated macOS desktop instance: ⌘W followed by ⌘N, reopening through the File menu, repeated ⌘N without duplicate windows, and restoring a minimized window.
• Windows/Linux use Electron's platform-aware accelerator; interactive testing was on macOS only.

UI Changes

Before	After

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

Implemented with GPT-6 via Codex.

Summary by CodeRabbit

• New Features
  • Added a New Window option to the desktop app’s File menu.
  • Added the Cmd/Ctrl+N keyboard shortcut for opening a new desktop window.

[macroscopeapp]

Approvability

Verdict: Approved at 3aa13ed

Macroscope's review found this PR approvable — This is an isolated 15-line desktop menu fix that routes File → New Window through the existing window activation behavior. It does not alter existing paths or introduce schema, security, billing, deployment, default, or static-analysis changes.

No code changes detected at 3548ec5. Prior analysis still applies.

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ℹ️ Recent review info

⚙️ Run configuration

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📥 Commits

Reviewing files that changed from the base of the PR and between 3aa13ed and 3548ec5.

📒 Files selected for processing (1)

• apps/desktop/src/window/DesktopApplicationMenu.ts

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📝 Walkthrough

Walkthrough

The desktop File menu adds a New Window item with a CmdOrCtrl+N accelerator. The handler resolves DesktopWindow and calls activate.

Changes

Desktop New Window Menu Action

Layer / File(s)	Summary
Wire New Window menu action apps/desktop/src/window/DesktopApplicationMenu.ts	Adds the newWindowClick handler and registers the New Window item with its accelerator and separator.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix

Suggested reviewers: juliusmarminge

Merge Risk: ⚪ Minimal · up to 3548e

The New Window action reuses the existing activation path and retains centralized failure handling, with no identified merge-blocking issue.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: adding a File menu action to reopen the main window.
Description check	✅ Passed	The description includes the required What Changed, Why, UI Changes, and Checklist sections. It explains the problem, implementation, validation, and UI impact. The interaction video is not included, …
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 1…
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

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[maria-rcks]

Note

Written by claude-opus-5-5 on behalf of Maria

Hi! We are cleaning up open PRs, and this one appears to have been created with an older model (gpt-6). If this change is really important, we recommend rebuilding the PR with a newer model if possible.

[maria-rcks]

Note

Written by claude-opus-5-5 on behalf of Maria

Reopening, this was closed by mistake. Sorry for the noise!