[FEATURE]: Add Git Graph/Diff View to Desktop App

[shreyashguptas]

Feature hasn't been suggested before.

• I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

It would be great to have a Git graph and commit history visualization feature in the opencode desktop app, similar to what VS Code provides in its Source Control view:

• Commit history graph - Visual representation of all commits with a graph showing branches and merges
• Branch visualization - See how branches diverge and merge
• Local vs remote sync status - Show differences between local and origin (ahead/behind commits)
• Working directory changes in context - Display uncommitted changes alongside the commit history

This would make it much easier to visualize the repository state without switching to another tool.

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• [FEATURE]: Session or Per-chat File Diff Viewer #5102: Requests an integrated diff viewer for inspecting code changes made during LLM sessions, which overlaps with the diff view aspect of this feature request.