Unify stream termination using the `sendStreamEnd` method to avoid duplicate code.
Add stream termination reason identification and handling for timeout and session expiration scenarios.
Centralize cleanup logic for various stream termination states in the WebView message hooks.
Adjust Tailwind CSS styles to resolve component layering display issues.
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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>