Add visual feedback for async operations across UI components:
- Profile list: Start, Delete, and Save buttons show spinners during actions
- Profile create: Create Profile button shows spinner during submission
- Nodes page: Initialize Node, Add Peer, Ping, and Remove buttons show spinners
Buttons are disabled while their action is in progress to prevent
duplicate submissions.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
