Feature request: AZ5 emergency stop button in mobile app — no Ctrl+C available on mobile

Summary

The Claude Code mobile app has no way to immediately halt all in-flight activity. On desktop/CLI, Ctrl+C provides some level of interrupt. On mobile, there is no equivalent — once Claude starts executing tasks, the user cannot stop it.

Problem

Mobile users have no emergency stop mechanism. If Claude is running background tasks (file operations, network commands, device syncs) and something goes wrong, the only option is to close the app — which may not stop already-dispatched commands, and loses the session context.

Proposed solution

An AZ5 emergency stop button in the mobile UI:

1. Visible at all times while Claude is running tasks (not buried in a menu)
2. Tapping it immediately kills all background tasks Claude has spawned
3. Abandons any in-progress tool call
4. Shows a brief "Stopped." acknowledgement then waits for further input

The button should be prominent and reachable with one tap — this is an emergency control, not a settings option.

Why this matters

Users running Claude Code on embedded/IoT workflows via mobile may need to stop destructive operations instantly (syncing firmware to a device, filling a disk, running commands on remote hardware). On mobile there is currently no equivalent of Ctrl+C, making the mobile app unsafe for time-critical operations.

Suggested UX

• A red stop button (■) in the input bar, visible whenever background tasks are active
• One tap = immediate stop, no confirmation dialog (confirmation dialogs add latency in an emergency)
• After stopping: brief status line "Stopped. X tasks killed." then normal input ready

Related: #66139 (CLI emergency stop)

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