Refactor/UI ux mention

[markbang]

Summary by cubic

Refactored the editor and file UI to use domain stores with native persistence and unified UX feedback. State is now predictable, autosave and view modes are supported, and settings/workspace persist across restarts.

• New Features

  • Added Zustand stores: editor, workspace, settings, and UI with typed selectors.
  • Persisted settings, current folder/file, and recent files via Tauri plugin-store and new commands.
  • Unified feedback with native dialogs and Sonner toasts (UXFeedback).
  • Keyboard shortcuts via react-hotkeys-hook.

• Refactors

  • Rewrote WritingArea and FileArea to use the new stores and simplify state.
  • Improved file read/write flow, loading states, and error handling; guarded settings load during SSR.
  • Simplified app/page layout and removed ad-hoc UI state; aligned Tauri store modules and removed redundant Rust types (kept RecentFile).
  • Added dependencies: zustand, react-hotkeys-hook, @tauri-apps/plugin-store.

^{Written for commit 72dde53. Summary will update on new commits.}

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