fix: add missing dependency array to useEffect in note-input

[devin-ai-integration]

Summary

Adds an empty dependency array [] to the useEffect at lines 98-103 in the note-input component. The effect was previously running on every render, which is typically incorrect and can cause performance issues.

The effect synchronizes the editor instance from a ref to state:

useEffect(() => {
  const editorInstance = internalEditorRef.current?.editor ?? null;
  if (editorInstance !== editor) {
    setEditor(editorInstance);
  }
}, []); // Added empty dependency array

Review & Testing Checklist for Human

• Verify editor state sync behavior: The original code ran on every render to detect ref changes. With [], it only runs on mount. Confirm this doesn't break editor state synchronization when switching between tabs (enhanced/raw/transcript).
• Test the useCaretNearBottom hook: This hook consumes the editor state - verify caret positioning still works correctly after tab switches.
• Test tab switching in note-input: Switch between enhanced notes, raw memo, and transcript tabs to ensure the editor reference is properly tracked.

Recommended test plan: Open a session, switch between different note tabs (Summary, Memo, Transcript), and verify the editor behaves correctly (focus, caret position, content editing).

Notes

• Requested by @yujonglee
• Link to Devin run

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