[FEAT] Request Deduplication GUIDs for Non-Idempotent Actions

[mark-e-deyoung]

Implement a deduplication mechanism for actions that are not naturally idempotent (e.g., control-click, control-send).

Proposed Strategy:

• Clients provide an optional or in the RPC params.
• Daemon tracks recently executed GUIDs in a rolling 60-second window.
• If a duplicate GUID is received, the daemon returns the previous result without re-executing the action.

This prevents accidental double-clicks or double-typing during network retries.