🤖 feat: implement soft-interrupts with block boundary detection

[ethanndickson]

Soft interrupts allow graceful stream cancellation at block boundaries (tool-result, reasoning-end, etc). First Escape triggers soft interrupt with orange UI feedback and waits for boundary; second Escape forces immediate abort.

Implementation

Frontend state tracking:

• AIView tracks interrupt state with useState
• First Escape press → sets flag, calls interruptStream({ soft: true })
• Second Escape press → calls interruptStream({ soft: false })
• Flag resets when stream ends via useEffect watching canInterrupt

Backend behavior:

• interruptStream(workspaceId, { soft?, abandonPartial? })
• If soft: true: Sets internal flag, cancels at next block boundary
• If soft: false: Immediate abort via cancelStreamSafely
• Block boundaries: tool-result, reasoning-end, reasoning-start, tool-call-start

UI feedback:

• Orange "⏸️ Interrupting..." text when soft interrupt pending
• Standard blue streaming indicator otherwise
• Cancel text shows "force" on second press

Testing

• Integration tests verify soft → hard interrupt progression
• Manual testing with tool calls and reasoning blocks
• Verified flag reset on stream completion

Generated with mux

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[ethanndickson]

@codex review

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