Fix desktop startup crash on launch

[MichelNivard]

Summary

• as noted in [Bug] #7 I had a launch bug, I had codex fix it, it fixed it for me, yoo could/should check it still builds on windows before merging
• move the editor keyboard-shortcut effect below the callback definitions it depends on to avoid the production startup crash from temporal dead zone access
• guard WarningBanner against missing editor/current-user data during startup
• suppress expected unauthenticated /api/user logging noise during desktop startup

Verification

• npm test --prefix frontend
• npm run build --prefix frontend
• npm run build:mac --prefix electron
• node scripts/electron-smoke.mjs dist/mac-arm64/QuartoReview.app/Contents/MacOS/QuartoReview

[Lakens]

will create a new release, v0.0.11 to incorporate this