Add dedicated mobile and Settings navigation stacks

[marksftw]

Summary

• rebases the six-commit mobile-navigation series onto origin/master (e36e5d0)
• replaces compact/mobile sidebar navigation with the shared full-screen MainMenu page while retaining the existing 296px desktop sidebar
• adds versioned menu/project/chat/New Chat history with Back/Hamburger behavior, iOS Tauri edge swipe, compact Settings push/pop, and chat unmount/catch-up lifecycle
• scales page-mode menu controls to phone proportions: 44px targets, 16px labels, 20px icons/wordmark, 60px overflow clearance, symmetric 16px insets, safe-area footer, and scrollable short-landscape behavior
• keeps the desktop-only workspace mode switch out of page mode
• hardens browser Forward/project draft scope, missing-chat fallback, slow conversation creation, duplicate attachment submissions, and Settings/transition cleanup
• updates docs/mobile-navigation-plan.md with the implemented sizing and remaining device checks

Validation

• bun test — 286 passing, 0 failing
• bun run typecheck — passed
• bun run lint — passed with 12 existing warnings and 0 errors
• bun run build — passed
• bun run format:check — passed
• git diff --check — passed
• focused mobile navigation/lifecycle suite — 59 passing, 0 failing
• generated production CSS verified for 44px targets, 60px title clearance, viewport-limited dropdowns, and safe-area padding
• pre-commit hook independently reran formatting, the production build, and all 286 tests successfully

Manual validation still required

Authenticated visual/device testing was unavailable: the managed workspace CLI is not installed, the local service ports were down, and the branch preview requires Cloudflare Access. These checks remain open:

• authenticated 390×844, 430×932, 844×390, breakpoint-adjacent, and normal desktop layouts in light and dark modes
• long-title, expanded-project, pinned/recent, search, selection, context-menu, Settings, and usage interactions on physical devices
• physical iPhone edge swipe plus iOS/Android lifecycle, safe-area, and keyboard checks

[coderabbitai]

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Run ID: eb61553e-9c94-488c-a233-b6e8425e45c9

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch mobile-navigation

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[cloudflare-workers-and-pages]

Deploying maple with    Cloudflare Pages

Latest commit:	41622d7
Status:	✅  Deploy successful!
Preview URL:	https://39775c7f.maple-ca8.pages.dev
Branch Preview URL:	https://mobile-navigation.maple-ca8.pages.dev

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