What problem(s) was I solving?

• Fixed an issue where the response input editor content was not properly clearing or updating when switching between different Claude Code sessions (ENG-2203)
• The editor was retaining content from the previous session, causing confusion and potential data leakage between sessions
• Users would see old text in the input field when switching to a different session, requiring manual clearing

What user-facing changes did I ship?

• The response input editor now automatically clears when switching to a different session that has no saved draft
• The editor properly loads any saved draft content for the newly selected session
• The editor defensively saves the current content before switching sessions to prevent data loss
• Both active sessions (using localStorage) and draft sessions (using database storage) now handle session switching correctly

How I implemented it

• Added a useEffect hook in both ActiveSessionInput.tsx and DraftLauncherInput.tsx that tracks session ID changes
• Implemented a reference (prevSessionIdRef) to track the previous session ID and detect when the user switches sessions
• When a session change is detected:
  1. Defensive save: The current editor content is saved to the previous session's storage (localStorage for active sessions, database for drafts) - this is a safety measure as the content should already be saved via the onChange handler
  2. Load new content: The appropriate saved content for the new session is loaded from storage
  3. Clear or populate: If there's saved content for the new session, it's loaded into the editor; otherwise, the editor is cleared
• Added comprehensive error handling and logging to track session switching behavior and debug any issues
• Ensured the solution works for both session types with their different storage mechanisms

How to verify it

Manual Testing

• Open CodeLayer with multiple Claude Code sessions
• Type some text in the response input for Session A
• Switch to Session B - verify the input clears (or shows Session B's saved draft)
• Type different text in Session B's input
• Switch back to Session A - verify Session A's text is restored
• Test with both active/running sessions and draft sessions
• Verify no console errors appear during session switching
• Test rapid switching between sessions to ensure stability

Automated Testing

• Tests pass: npm test
• Build succeeds: npm run build

Description for the changelog

Fixed response input editor not clearing when switching between Claude Code sessions, preventing content from one session appearing in another