* feat(flow chat): add cancel button
Add cancel button to flow chat interface that appears when a flow is executing.
- Replace send button with red stop button when processing
- Wire up cancel functionality to stop flow execution
- Support both polling and streaming modes
- Fixes#6868🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: windmill-internal-app[bot] <windmill-internal-app[bot]@users.noreply.github.com>
* fix
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Co-authored-by: claude[bot] <41898282+claude[bot]@users.noreply.github.com>
Co-authored-by: windmill-internal-app[bot] <windmill-internal-app[bot]@users.noreply.github.com>
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