Feature: Sidebar-based lazy Git staging & committing (à la lazygit)

[myusuf3]

Add lightweight Git controls to the sidebar that enable staging, unstaging, and committing changes in a fast, keyboard-friendly workflow similar to lazygit—without leaving the current review/editing context.

Motivation
While fixing review comments, switching between diff views and external Git tools breaks flow. A built-in, minimal interface for common Git actions would streamline iteration and reduce context switching.

Proposed Solution
Introduce a sidebar panel with core Git actions:

• File list with status (modified, added, deleted, renamed)
• Stage/unstage controls
  • Toggle per file
  • Optional hunk-level staging
• Diff preview
  • Inline or split view
  • Navigate by file/hunk
• Commit box
  • Message input with validation
  • Support for amend
• Quick actions
  • Stage all / unstage all
  • Discard changes (with confirmation)
  • Commit & push (optional toggle)

Interaction Model

• Keyboard-first navigation (up/down, enter, space to toggle stage)
• Persistent selection and scroll position
• Non-blocking updates as files change

Expected Behavior

• Staged state persists during navigation and diff reloads
• No loss of in-progress selections or commit message
• Works seamlessly alongside review annotations

Actual Gap Today

• No integrated, low-friction Git workflow in the sidebar
• Requires switching tools or panels to stage/commit

Impact

• Faster iteration when addressing review comments
• Reduced cognitive load and context switching
• Closer parity with efficient terminal workflows (e.g., lazygit)

Nice-to-haves

• Hunk splitting/editing before staging
• Commit templates / linting (e.g., Conventional Commits)
• Inline conflict resolution indicators
• Optional autosave of commit message drafts