fix(patch): cherry-pick 265f24e to release/v0.12.0-preview.9-pr-12412 [CONFLICTS]

[gemini-cli-robot]

This PR automatically cherry-picks commit 265f24e to patch version v0.12.0-preview.9 in the preview release to create version 0.12.0-preview.10.

⚠️ Merge Conflicts Detected

This cherry-pick resulted in merge conflicts that need manual resolution.

🔧 Next Steps:

1. Review the conflicts: Check out this branch and review the conflict markers
2. Resolve conflicts: Edit the affected files to resolve the conflicts
3. Test the changes: Ensure the patch works correctly after resolution
4. Update this PR: Push your conflict resolution

📋 Files with conflicts:

The commit has been created with conflict markers for easier manual resolution.

🚨 Important:

• Do not merge this PR until conflicts are resolved
• The automated patch release will trigger once this PR is merged

[gemini-code-assist]

Summary of Changes

Hello @gemini-cli-robot, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request aims to enhance the responsiveness of the user interface by ensuring that model changes are immediately reflected. It achieves this by implementing a new event-driven mechanism where the core configuration system emits a ModelChanged event whenever the active model is updated. The main UI container then subscribes to this event, allowing for real-time synchronization of the displayed model. This is an automated cherry-pick that requires manual conflict resolution.

Highlights

• New ModelChanged Event: A new ModelChanged event has been introduced in the core event system to signal when the active model is updated.
• Config Class Emits Event: The Config class now emits the ModelChanged event whenever its setModel method successfully changes the current model.
• UI Reacts to Model Changes: The AppContainer UI component has been updated to subscribe to the ModelChanged event, ensuring that the UI immediately reflects any changes to the active model.
• New Unit Tests: New unit tests have been added to verify the correct emission of the ModelChanged event and the AppContainer's subscription and state update.
• Merge Conflicts Detected: This pull request is an automated cherry-pick and currently has merge conflicts that require manual resolution before it can be merged.

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[gemini-code-assist]

Code Review

This pull request cherry-picks a fix to ensure UI updates when the model changes. The changes involve adding a ModelChanged event and updating the AppContainer to listen for it. However, a critical issue was found: an unresolved merge conflict in packages/core/src/config/config.test.ts which will prevent the code from compiling. This must be resolved before merging.

[github-actions]

Size Change: +630 B (0%)

Total Size: 20.2 MB

ℹ️ View Unchanged

Filename	Size	Change
./bundle/gemini.js	20.2 MB	+630 B (0%)
./bundle/sandbox-macos-permissive-closed.sb	1.03 kB	0 B
./bundle/sandbox-macos-permissive-open.sb	890 B	0 B
./bundle/sandbox-macos-permissive-proxied.sb	1.31 kB	0 B
./bundle/sandbox-macos-restrictive-closed.sb	3.29 kB	0 B
./bundle/sandbox-macos-restrictive-open.sb	3.36 kB	0 B
./bundle/sandbox-macos-restrictive-proxied.sb	3.56 kB	0 B

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