fix(web): add pointer cursor to running stop-generation button

[binbandit]

Summary

• add cursor-pointer to the running stop button in the thread composer
• add a browser regression test that asserts the rendered stop button exposes a pointer cursor while the thread is running

Validation

• bun fmt
• bun lint
• bun typecheck
• bun run test:browser -- -t "shows a pointer cursor for the running stop button"

Note

Add pointer cursor to the 'Stop generation' button when session is running

Adds cursor-pointer to the 'Stop generation' button in ChatView.tsx so it looks interactive during a running session. A new browser test verifies the computed style, using an extended createSnapshotForTargetUser helper that now accepts an optional sessionStatus parameter.

^{Macroscope summarized 4b0e9eb.}

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