fix(desktop): keep code and diffs out of the tool overflow window

[OutThisLife]

Summary

A run of 3+ adjacent tool calls collapses into the 6.75rem .tool-group-scroll window added in #57913. That's the right call for status rows, but a patch / write_file / execute_code / read_file row's body is a code block the user reads, and the window squeezed it into a ~2-row viewport behind a fade mask.

This extends the existing UNBOUNDABLE_TOOLS opt-out — the same mechanism #64679 used for clarify forms and #65142 used for generated images — to the code-bearing tools.

Why the existing break-out isn't enough

.tool-group-scroll:has([data-tool-row][data-tool-open]) already lifts the cap once a row is expanded, and it works — that's why most tools are safe to bound, and this PR leaves them bounded.

It can't cover this case. clarify / image_generate render their own components and never emit data-tool-row, so the rule can't reach them at all. The code tools do emit it, but the user has to first notice the clipped block and expand it before the code is legible — reading a diff shouldn't require discovering an affordance.

Notes

• terminal stays boundable on purpose. Console output is a log tail whose last lines are the ones that matter, which is exactly what the window pins. Exempting it too would swallow the feature whole, since nearly every long run contains one.
• The file-edit names are derived from the existing isFileEditTool rather than re-listed, so a newly supported edit tool can't be exempt in one place and clipped in the other.
• UNBOUNDABLE_TOOLS is no longer exported; isUnboundableTool is the single entry point.

Test plan

Verified in Chrome against the app's compiled Tailwind CSS (measuring real laid-out height, since jsdom does no layout). A 3-call run carrying a 520px diff:

	rendered	content	clipped
before (bounded)	108px	520px	yes
after (unbounded)	520px	520px	no

• npx vitest run src/components/assistant-ui — 209 passed
• npx tsc --noEmit clean
• npx eslint clean

Unit tests assert the invariant (every isFileEditTool name is unboundable; terminal / web_search still bound) rather than snapshotting the set's contents.

[github-actions]

૮ >ﻌ< ა ci review

_{ran on 7f29710}

ℹ️ Info

Desktop E2E visual evidence · View test artifacts · View job

1 visual diff.

_{inline evidence is publishing...}