perf(window-management): make AeroSpace workspace moves async

[JustYannicc]

Summary

• Extracted AeroSpace workspace reconciliation into src/main/aerospace-workspace.ts.
• Replaced synchronous execFileSync('aerospace', ...) calls from the launcher show path with async execFile-backed fire-and-forget work.
• Added in-flight coalescing so repeated show/post-show requests produce at most one follow-up reconciliation while a run is active.
• Added regression coverage for coalescing, missing aerospace binary behavior, and non-blocking slow-command behavior.

Why

showWindow() called moveWindowToCurrentAerospaceWorkspace() before showing/focusing the launcher and again shortly after show. That helper performed multiple synchronous CLI calls on the Electron main process, so slow aerospace startup/server responses could directly delay launcher visibility, focus, and menu-bar responsiveness.

Performance Evidence

Controlled fake aerospace command delay: 120 ms per invocation.

Before:

• sync helper duration: 734 ms
• zero-delay timer fired after: 734 ms

After:

• requestMove() returned after: 0 ms
• zero-delay timer fired after: 0 ms
• background reconciliation idle after: 364 ms
• command count: 3

Validation

• node --test scripts/test-aerospace-workspace.mjs
• /opt/homebrew/Cellar/node@22/22.22.3/bin/npm test (live Electron crash recovery self-skipped because Electron was not launchable here)
• /opt/homebrew/Cellar/node@22/22.22.3/bin/npm run check:i18n (exits 0; existing Italian missing keys reported: settings.ai.whisper.vocabulary, settings.extensions.appSearchScope)
• /opt/homebrew/Cellar/node@22/22.22.3/bin/npm run build:main
• Codex LSP diagnostics for src/main: 0 errors

Risks

• AeroSpace movement is now eventual rather than blocking before mainWindow.show(). The existing post-show reconciliation remains and coalesces with any in-flight pre-show request to preserve placement as closely as possible without holding the main process.
• Non-ENOENT command failures remain transient and retry on later show requests, matching the previous behavior.

[JustYannicc]

Superseded by consolidated upstream PR #534 (perf(mac): reduce native polling and async IO stalls), which carries this change together with the related macOS/native/audio/camera async IO performance fixes. Closing this source PR so review can continue on #534.