STU-1873: Add tool call detail panel

[shaunandrews]

Related issues

• Related to https://linear.app/a8c/issue/STU-1873/studio-agentic-ui-improve-tool-call-presentation
• Stacked on STU-1873: Improve tool call descriptions #3903

How AI was used in this PR

I used AI assistance to port the tool-row presentation from the older exploration branch onto current trunk, keep the scope limited to the classic Agentic UI transcript, and add regression tests. I reviewed the final diff, ran automated checks, and verified the UI in light and dark modes with a temporary Vite harness.

Proposed Changes

• Makes classic Agentic UI tool calls easier to scan by showing an icon, a human-readable label, and a compact detail.
• Lets users expand a tool row to inspect the command/input and output without long output taking over the transcript.
• Keeps Ask User questions from rendering a duplicate raw tool row, so the custom question UI remains the only visible prompt.

Testing Instructions

• Run npm test -- tools/common/ai/tests/tools.test.ts apps/cli/ai/tests/ui.test.ts apps/ui/src/ui-desks/chats/conversation/index.test.ts apps/ui/src/ui-classic/components/session-view/conversation/index.test.ts.
• Run npm run typecheck.
• In classic Agentic UI, trigger tool calls such as WP-CLI and Bash, then click the tool rows to confirm input/output appears inside a bounded scrollable details panel.
• Check the tool rows and expanded details in both light and dark color schemes.

Pre-merge Checklist

• Have you checked for TypeScript, React or other console errors?