Add a "send now" button to queued AI-chat messages: it interrupts the
running agent and immediately sends that message, while the agent's
partial output at interruption is kept in history and the next turn is
marked as a user interrupt.
Client:
- queue-helpers: pure `promoteToHead` to move a queued message to the head.
- chat-thread: `sendNow` (promote head + abort + flush-on-abort), one-shot
`flushOnAbortRef`/`interruptNextSendRef`, `interrupted` flag in the
request body, and the "send now" ActionIcon in the queued list.
Server:
- `interrupted` on AiChatStreamBody; pure `isInterruptResume` confirms the
client hint against persisted history (prev assistant turn aborted/
streaming) before honouring it.
- prompt: INTERRUPT_NOTE injected in the context section only on a
confirmed interrupt-resume turn so the model treats the partial answer
above as incomplete.
Tests: promoteToHead, chat-thread send-now (abort + resend + one-shot
interrupt flag + non-streaming immediate send), isInterruptResume, and
the prompt interrupt-note injection.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>