Code review response: address debounce implementation issues

[Copilot]

Responded to code review request with findings on the debounced write implementation for user settings.

Issues Identified

• Memory leak risk: debouncedRemoteWrites Map entries lack cleanup in error paths
• Unbounded delays: No maximum debounce time - rapid successive writes can postpone API calls indefinitely
• Type safety: Unsafe casting between DebounceEntry<unknown> and DebounceEntry<T>

Recommendations

• Add max debounce time limit (e.g., 2000ms)
• Implement cleanup for abandoned requests
• Extract debounce logic to testable utility with unit tests
• Add integration tests for rapid setting changes

Current implementation is functional but needs hardening for production use.

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