feat(tui): restore tool detail visibility controls - #49474

Issue for this PR

Closes #45872

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

Large completed tool outputs can make long TUI sessions difficult to read. This restores the V1-style ability to hide completed tool details while keeping running and failed tools visible.

It adds a persistent session.tool_details preference plus a bindable session.toggle.tool_details command. The command is intentionally unbound by default so it does not conflict with the existing <leader>i image shortcut.

PR #48300 overlaps with this change and provides broader show / minimal / hide modes. This PR is the narrower option focused on restoring the show/hide control and keyboard binding requested in #45872; I am happy for maintainers to fold these pieces into #48300 if that direction is preferred.

How did you verify your code works?

• bun test test/config-v2.test.tsx test/keybind.test.ts: 20 passed, 0 failed.
• bun run lint: 0 warnings and 0 errors.
• Full pre-push bun run typecheck: 35 tasks passed.
• The side-by-side patched client was connected to the user's existing V2 server and sessions without changing server or session data.
• The user verified the problem and reviewed the resulting behavior and proposed control.

To verify manually, set session.tool_details to hide, or bind and invoke session.toggle.tool_details, in a session containing completed, running, and failed tool calls. Completed calls should disappear; running and failed calls should remain visible.

Screenshots / recordings

Not attached yet. The change restores the previous Hide tool details behavior without otherwise changing the TUI layout. A recording can be added if maintainers want one.

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

AI disclosure: This PR was created with OpenAI gpt-5.6-sol (medium variant) through the OpenCode V2 harness. The user directed the implementation and reviewed and verified the result.