fix: Note content corruption on restart

[rgcr]

Problem

After an OS restart (or app relaunch), inactive notes have their content replaced with the active note's content. The first note's content gets replicated to the others.

Root Cause

The contentChanged debounce timer (300ms in JS) captures currentNoteId at fire time, not at schedule time. When a note switch occurs between scheduling and firing:

1. User edits note A → debounce timer starts (300ms)
2. User clicks note B → Swift queues: serializeState(), setCurrentNoteId('B'), restoreState(B)
3. JS executes setCurrentNoteId('B') → currentNoteId = B
4. Debounce fires → sends A's content with noteId = B → overwrites note B with A's content
5. restoreState(B) executes → clears debounce (too late), loads B's correct content from stateCache

The corruption is invisible during the session because the in-memory stateCache still holds B's correct content. But on next launch (or after OS restart), stateCache is empty and B loads from the corrupted persisted data — showing A's content.

Fix

Clear the debounce timer in setCurrentNoteId(). This is safe because serializeState() → cacheSerializedState() already persists the old note's content before setCurrentNoteId is called in every note-switch path.

window.setCurrentNoteId = function (id) {
  clearTimeout(debounceTimer);
  currentNoteId = id;
};

Changed files

• editor-web/src/editor.js — 1 line added in setCurrentNoteId()