feat(rebase): add interactive rebase editor

[CalvinAllen]

Description

Add a visual interactive rebase editor that provides a user-friendly interface for git rebase -i operations, making it easy to reorder, squash, edit, and drop commits.

Features

Visual Editor

• List of commits in rebase sequence
• Drag-and-drop commit reordering
• Action dropdown per commit (pick, reword, edit, squash, fixup, drop)
• Color-coded actions for visual clarity
• Commit details preview panel

Rebase Actions

• pick - Use commit as-is
• reword - Edit commit message
• edit - Stop for amending
• squash - Combine with previous commit
• fixup - Combine with previous, discard message
• drop - Remove commit entirely

Editor Controls

• Start rebase button
• Abort rebase button
• Continue rebase (after edit/conflict)
• Skip commit button
• Reset to original order

Conflict Resolution

• Visual conflict indicator
• Quick access to merge tool
• Mark as resolved action
• Abort option during conflicts

Visual Elements

• Commit SHA (abbreviated)
• Commit message (first line)
• Author and date
• Action indicator/dropdown
• Reorder handle (drag grip)
• Expand for full commit details

Configuration Options

• Auto-open editor for rebase -i
• Default action for new commits
• Confirm before starting rebase
• Show commit details by default

Acceptance Criteria

• Editor opens for interactive rebase operations
• Drag-and-drop reordering works
• All rebase actions can be applied
• Rebase executes correctly with configured actions
• Conflict resolution workflow functions
• Abort/continue/skip operations work