Add interrupt and queue actions for running turns

[SudoJacky]

Summary

• add explicit Insert into current task and Queue for next turn actions while an agent turn is running
• make insert cancel the active turn and wait for both cancellation acknowledgement and the terminal interruption event before starting a new turn
• preserve the selected model, attachments, and context references across normal, queued, and interrupt sends
• restore the normal send action after the canonical turn becomes terminal
• remove successfully submitted inputs from the pending-input queue

Root cause

The composer UI and submission path used different sources of truth for running state, and each send mode assembled its input independently. This allowed an insert to bypass cancellation when session summary state was stale, lose the selected model or references, and retain a submitted item in the pending queue.

User impact

Users can now correct a running agent without overlapping turns or restarting the conversation. Queued input remains non-disruptive, and both paths use the same complete turn input as a normal send.

Validation

• npm test — 75 files, 501 tests passed
• npx tsc --noEmit
• git diff --check

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Reconcile pending inserts after resubscribing

If the user closes the session tab after requesting an insert but before the interrupted terminal event arrives, both subscription effects unsubscribe from that session because it is no longer open. This terminal flag is therefore never recorded, and reopening the session only reloads its terminal timeline—it does not call this handoff path—so the inserted message remains permanently queued and cannot even be cleared while its status is queued. Reconcile pending inserts against the loaded canonical turn state when subscribing or reopening rather than relying exclusively on observing the live terminal event.

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