Add TODO.md with future improvements and unsaved note switching proposal

TODO.md

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+# TODO - Future Improvements
+
+## High Priority
+
+### Unsaved Note Switching
+**Current Behavior:** When a note has unsaved changes, switching to another note is completely blocked. User must either save or discard changes first.
+
+**Proposed Improvement:** Implement local session storage for unsaved changes:
+- Store unsaved note content in browser's sessionStorage/localStorage
+- Allow switching between notes without losing unsaved changes
+- Each note maintains its own unsaved state independently
+- Unsaved changes persist across note switches but don't trigger server sync
+- Visual indicator shows which notes have unsaved local changes
+- Only sync with server when user explicitly saves
+
+**Benefits:**
+- More flexible editing workflow
+- Can work on multiple notes simultaneously
+- No data loss when switching notes
+- Better matches user expectations from modern editors
+
+**Technical Approach:**
+- Use Map/Object to store unsaved changes per note ID
+- Key: note ID, Value: { title, content, timestamp }
+- Load from local storage on note switch
+- Clear local storage on explicit save or discard
+- Add visual indicator (dot/asterisk) on notes with local changes
+
+---
+
+## Medium Priority
+
+### Other Improvements
+- Add keyboard shortcuts (Cmd+S for save, Cmd+N for new note, etc.)
+- Implement note search within content (not just titles)
+- Add tags/labels system as alternative to categories
+- Export multiple notes at once
+- Import notes from other formats (Markdown files, etc.)
+- Offline mode with queue for syncing when connection returns
+
+---
+
+## Low Priority
+
+### Nice to Have
+- Note templates
+- Rich text paste handling
+- Image upload/embedding support
+- Note linking (wiki-style)
+- Version history/undo for saved notes
+- Customizable editor themes
+- Font size adjustment