feat: add See All Changes button when task completes

[roomote]

This PR attempts to address Issue #10729. Feedback and guidance are welcome.

Summary

This PR adds a "See All Changes" button that appears when a task completes. When clicked, it shows a diff view of all changes made during the task.

Changes

1. Added translation strings for the new "See All Changes" button in webview-ui/src/i18n/locales/en/chat.json

2. Modified ChatView.tsx to:

   • Add a new state variable showSeeAllChangesButton to track when to show the button
   • Show the button when task completes (completion_result) and there are checkpoints available
   • Add handler function handleSeeAllChangesClick that sends a checkpointDiff message with mode "full"
   • Render the button alongside the "Start New Task" button

How it works

• When a task completes (receives completion_result), the code checks if there are any checkpoint messages in the task
• If checkpoints exist, the "See All Changes" button is shown next to the "Start New Task" button
• Clicking the button triggers checkpointDiff with mode "full", which compares from the first checkpoint to the current workspace state
• This opens VSCode's multi-file diff view showing all changes made during the task

Testing

• TypeScript compilation passes
• All existing ChatView tests pass (23 tests)
• ESLint checks pass

Closes #10729

---

Important

Adds a "See All Changes" button in ChatView.tsx to display a diff view of all changes when a task completes and checkpoints are available.

• Behavior:
  • Adds "See All Changes" button in ChatView.tsx when task completes and checkpoints exist.
  • Button triggers checkpointDiff with mode "full" to show a diff view.
• State Management:
  • Introduces showSeeAllChangesButton state in ChatView.tsx to control button visibility.
  • Updates button visibility based on completion_result and checkpoint presence.
• Translations:
  • Adds translation strings for "See All Changes" button in chat.json.

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[roomote]

Rooviewer   See task on Roo Cloud

Reviewed the implementation. No issues found. The PR correctly:

• Adds the "See All Changes" button when a task completes and checkpoints exist
• Properly manages button state across task lifecycle
• Sends the correct checkpointDiff message with mode "full"
• Follows existing UI patterns for button styling

Looks good to merge.

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