Add update-ui tool with synchronous UI action handling

[wesen]

This PR introduces a synchronous UI update system that waits for user actions
before completing requests, making it easier to build interactive applications.

Key changes:

• Refactored UI handling into a dedicated UIHandler struct for better
  organization
• Added a wait registry to track pending UI requests using channels
• Implemented request ID tracking between UI updates and user actions
• Added automatic UI reset after a completed request
• Added a click-submit detection mechanism with configurable delay (200ms)
• Enhanced error handling with detailed error responses
• Updated JavaScript to track and pass request IDs with actions
• Added documentation on the form submission model and best practices
• Fixed heredoc string handling in shell scripts to prevent expansion errors

UI system improvements:

• Made IDs optional for title, text, and list components
• Improved validation for list items
• Added request timeout handling (default 120 seconds)
• Added background cleanup for orphaned requests
• Enhanced logging for better debugging
• Added resolved status in action responses