feat(terminal): add default command output collapse setting

[bigyao25]

Related GitHub Issue

Related to #605.

The author has posted Claiming on the issue. Maintainer assignment is pending.

Description

Verbose Inline Terminal output can fill the chat. Add an independent Collapse command output by default setting under Terminal.

• Keep the setting off by default to preserve existing behavior.
• When enabled, start command output collapsed in both terminal modes. Keep manual expand and collapse controls.
• Respect the preference during shell integration fallback. Preserve output that the user has manually expanded.
• Buffer edits until Save. Persist the value through ContextProxy and return it to the webview.
• Add an optional boolean schema, shared default, and import/export support.
• Add labels and descriptions for all 18 supported languages.

This supports Enhanced User Experience. Command execution, output collection, and the selected terminal backend stay unchanged.

This PR implements the independent preference requested in #605. It does not add a last-lines preview or a new exit-code summary.

Test Procedure

Passed locally:

• Shared setting schema suite: 10 tests.
• Extension persistence and webview state suites: 293 tests.
• Command output and SettingsView suites: 80 tests.
• Full workspace type checks through the push hook.
• Full workspace lint through the commit hook, focused lint, formatting, and git diff --check.
• Translation completeness check for all supported locales.
• Four TerminalSettings visual comparisons in the repository-pinned Playwright Docker image.

Repeat the focused tests:

pnpm --dir packages/types exec vitest run src/__tests__/global-settings.test.ts
pnpm --dir src exec vitest run core/webview/__tests__/ClineProvider.spec.ts core/webview/__tests__/webviewMessageHandler.spec.ts
pnpm --dir webview-ui exec vitest run src/components/chat/__tests__/CommandExecution.collapse.spec.tsx src/components/chat/__tests__/CommandExecution.spec.tsx src/components/settings/__tests__/SettingsView.spec.tsx

Manual review:

1. Keep Use Inline Terminal enabled.
2. Enable Collapse command output by default and click Save.
3. Run a command with verbose output. Verify the output starts collapsed and can be expanded manually.
4. Reopen settings. Verify the saved preference remains enabled.
5. Disable the preference and save. Verify a new inline command starts expanded.

Local tools: macOS, Node 24.21.0, pnpm 10.8.1. The repository requests Node 22.23.1.

Pre-Submission Checklist

• Issue Linked: Maintainer approval and assignment are pending for [ENHANCEMENT] Collapsible command output #605.
• Scope: One independent command output display preference.
• Self-Review: Automated implementation review completed. Human review is pending.
• Writing Style: Short sentences and plain words.
• Testing: Focused regression tests cover the complete setting round trip.
• Visual Snapshot: Gallery test and four container-generated theme baselines are included.
• Documentation Impact: The setting description explains behavior and compatibility.
• Contribution Guidelines: Read the repository contribution and agent guidance.

Visual Snapshots

TerminalSettings.visual.tsx covers the production settings screen in dark, light, high-contrast, and high-contrast-light themes.
The four baselines were generated and compared in the repository-pinned Playwright Docker image.
The temporary container path contains Corepack pnpm shims. Lockfile dependencies include Linux native packages for the container run.
No repository dependency files changed.

Documentation Updates

The setting contains translated help text. No separate documentation change is required for this PR.

Additional Notes

Codex helped implement and test this change. Human review and maintainer assignment are required before marking this draft ready.
The PR keeps existing users on the current display behavior until they enable the preference.

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