fix: clean up timeout in PlanSidebar to prevent memory leaks

[hobostay]

Summary

Fix timeout cleanup bug in PlanSidebar that could cause memory leaks and incorrect UI state.

Changes

• PlanSidebar.tsx: Store timeout in ref and clear it on unmount or re-click

Bug Details

The copy timeout was not being cleared when:

1. The component unmounted
2. The copy button was clicked multiple times

This could cause memory leaks and the "copied" state to persist incorrectly.

Related Issues

Fixes #792 - Toasts keep hanging

Co-Authored-By: Claude Opus 4.6 noreply@anthropic.com

Note

Fix timeout cleanup in PlanSidebar to prevent memory leaks on unmount

• Stores the copy feedback timeout ID in a copiedTimerRef ref and clears any active timeout before starting a new one, so rapid successive copies no longer stack timers.
• Adds a useEffect cleanup to clear any pending timeout when the component unmounts, preventing post-unmount state updates.
• Risk: the useEffect cleanup block was placed inside the returned JSX rather than at the top level of the component function, which is syntactically invalid in TSX and may cause a runtime error.

^{Macroscope summarized 5388f04.}

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