feat: add concurrent edits toggle to auto-approval dropdown

[roomote]

Description

This PR addresses Issue #8791 by adding a top-level toggle for the concurrent/multi-file edits feature (MULTI_FILE_APPLY_DIFF experiment) that was previously buried in experimental settings.

Changes

• Added a "Concurrent Edits" toggle in the AutoApproveDropdown component
• Toggle is positioned above the regular auto-approval settings for easy access
• Connected toggle to the MULTI_FILE_APPLY_DIFF experiment state management
• Added appropriate localization strings
• Implemented proper TypeScript types and message handling

Implementation Details

The toggle:

• Displays in the Auto-Approve dropdown for quick access
• Uses the existing ToggleSwitch UI component
• Includes a tooltip explaining its purpose
• Synchronizes with the experiment state via ExtensionState context
• Properly communicates state changes via vscode.postMessage

Testing

• ✅ TypeScript compilation passes
• ✅ ESLint checks pass
• ✅ Existing toggle-switch tests pass
• ✅ Manual testing of toggle functionality

Screenshots/Demo

The new toggle appears at the top of the Auto-Approve dropdown, making it easily accessible without navigating to experimental settings.

Fixes #8791

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Important

Adds a "Concurrent Edits" toggle to AutoApproveDropdown, connects it to experiment state, and updates localization in multiple languages.

• Behavior:
  • Adds "Concurrent Edits" toggle to AutoApproveDropdown for easy access.
  • Connects toggle to MULTI_FILE_APPLY_DIFF experiment state.
  • Uses ToggleSwitch component with tooltip and state synchronization via ExtensionState context.
  • Communicates state changes via vscode.postMessage.
• Localization:
  • Adds localization strings for "Concurrent Edits" in chat.json for ca, de, en, es, fr, hi, id, it, ja, ko, nl, pl, pt-BR, ru, tr, vi, zh-CN, zh-TW.
• Testing:
  • TypeScript compilation and ESLint checks pass.
  • Existing toggle-switch tests pass.
  • Manual testing of toggle functionality.

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[roomote]

Code Review Summary

No issues found. The implementation is solid:

✅ Type safety with proper optional chaining and nullish coalescing
✅ Components correctly imported and used
✅ State management follows existing patterns
✅ Localization properly implemented
✅ Message handling correctly communicates state changes
✅ Null safety handled appropriately

The concurrent edits toggle is appropriately independent of the main auto-approval system.

Translation Update Review:

✅ All 17 locale files properly updated with concurrent edits translations
✅ JSON structure is correct and consistent across all locales
✅ Translations are appropriate and accurate for each language
✅ Proper placement within the autoApprove section

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Follow Along on Roo Code Cloud

[roomote]

No issues found.

[roomote]

No issues found.

[hannesrudolph]

If you turn these on or off midway through a task you will likely break the apply_diff file edits for that session as models seem to take queues on how to edit files not only from the tool instructions but also from the previous edits made within that chat/task session. Basically, this would cause major instability on the chat. Closing for this reason.