fix: Handle mode selector empty state on workspace switch

[roomote]

Closes #10660

Summary

Fixes a bug where the mode selector would show an empty string when switching between VS Code workspaces if the current mode from workspace A is not available in workspace B.

Changes

• Import defaultModeSlug from @roo/modes
• Add fallback logic in selectedMode useMemo to detect when the current mode is not available and automatically switch to the default "code" mode
• Add tests to verify the fallback behavior works correctly
• Export defaultModeSlug in test mock for consistent behavior

Testing

• Added two new tests in ModeSelector.spec.tsx:
  1. Verifies that onChange is called with the default mode when current mode is not available
  2. Verifies that the default mode name is displayed instead of an empty string
• All existing tests continue to pass

Behavior

When the mode selector detects that the current mode is not in the list of available modes (e.g., after switching workspaces), it will:

1. Automatically switch to the default "code" mode
2. Display the mode name instead of an empty string
3. Notify the parent component to update the mode state

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View task on Roo Code Cloud

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Important

Fixes ModeSelector to fallback to default mode when current mode is unavailable, preventing empty string display.

• Behavior:
  • ModeSelector now falls back to defaultModeSlug when the current mode is unavailable, displaying "code" instead of an empty string.
  • Notifies parent component to update mode state when fallback occurs.
• Code Changes:
  • Import defaultModeSlug from @roo/modes in ModeSelector.tsx.
  • Add fallback logic in selectedMode useMemo and useEffect to handle unavailable modes.
• Testing:
  • Add tests in ModeSelector.spec.tsx to verify fallback to default mode and correct display of mode name.
  • Ensure onChange is called with default mode when current mode is unavailable.

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[roomote]

Rooviewer   See task on Roo Cloud

Re-reviewed after new commits. All previously flagged issues have been resolved.

Previous reviews

• ab28868: Review #1
• ab28868: Review #2
• 619576d: Review #3
• c881e0f: Review #4

_{Mention @roomote in a comment to request specific changes to this pull request or fix all unresolved issues.}

[brunobergher]

@roomote address the feedback

[roomote]

Fixaroo   See task on Roo Cloud

Fixed the reported issue. All local checks passed.

_{View commit | Revert commit}

[roomote]

Fixaroo   See task on Roo Cloud

Fixed the infinite loop issue by adding a ref to track notified invalid modes and removing onChange from the useEffect dependencies. All local checks passed.

_{View commit | Revert commit}

[roomote]

Rooviewer   See task on Roo Cloud

Re-reviewed after new commits. All previously flagged issues have been resolved.

Previous reviews

• 619576d: Review #1
• c881e0f: Review #2

_{Mention @roomote in a comment to request specific changes to this pull request or fix all unresolved issues.}