Clarify running-turn stop messaging

[Jeccoman]

What Changed

This updates the running-turn composer state to show a clearer blocked-send message, with specific wording when a long-running terminal command is still active. It also makes the stop action more explicit in the composer UI so it is easier to understand how to unblock the thread.

Why

When a turn was already running, the blocked state did not clearly explain whether the user was waiting on normal generation or on a long-running command. This makes that state easier to understand and makes the stop path more obvious, which should reduce confusion when a thread appears stuck.

UI Changes

Checklist

• [1 ] This PR is small and focused
• [ 2] I explained what changed and why
• [ 3] I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

Note

Add contextual stop messaging to ChatView when a turn is running

• Adds buildRunningTurnBlockedMessage in ChatView.logic.ts that returns one of two messages depending on whether a long-running terminal subprocess is active.
• In ChatView.tsx, attempting to send while a turn is running now sets a thread error with this message instead of silently blocking.
• The running-state UI replaces the bare stop icon with a labeled stop button, explanatory text (hidden on small screens), and a tooltip using the same message.

^{Macroscope summarized f734a2e.}

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