Problem

When using Stik in local mode (custom notes directory), external file modifications are not detected by the app. If another program (e.g., a CLI tool, another editor, or a script) modifies a .md file in the Stik directory, the changes are not reflected in the Stik UI until the app is restarted.

Root Cause (from code analysis)

• iCloud mode: File watching is fully implemented via NSFileCoordinator → notify_external_change() → frontend event. Works great.
• Local mode: No file system watcher exists. Notes are read once via std::fs::read_to_string() and cached in AppState::viewing_notes. The cache is never invalidated on external file changes.

Key locations:

• src-tauri/src/commands/storage.rs — no local file watching (line 313-325)
• src-tauri/src/commands/index.rs — notify_external_change() exists but is never called for local files
• src-tauri/src/windows.rs — get_viewing_note_content() returns cached content without checking disk (line 488-502)

Proposed Solution

Add a file system watcher for local mode using notify-rs crate:

1. Watch the Stik root directory recursively for .md file changes
2. On change, call the existing index.notify_external_change() method
3. Emit a frontend event (similar to icloud-files-changed) to trigger UI refresh
4. In get_viewing_note_content(), check file modification timestamp vs cache timestamp

The architecture already supports this — notify_external_change() and the frontend event system are in place. Only the local file watcher trigger is missing.

Use Case

I use Stik alongside Obsidian and CLI tools (Claude Code). My workflow:

• Stik notes directory points to an Obsidian vault folder
• CLI tools update note contents programmatically
• I expect Stik to reflect those changes in real-time

Love the app — this would make it perfect for developer workflows!