feat(commands): add Git Command Palette

[CalvinAllen]

Description

Add a Git Command Palette providing a guided, searchable interface for executing Git operations with step-by-step assistance and parameter collection.

Note: This feature provides an alternative command-line interface for Git operations. Many of these operations also have dedicated tool windows that provide richer UI experiences. The Command Palette offers quick keyboard-driven access to the same functionality.

Features

Command Categories

Branch Operations

• Create branch
• Delete branch
• Rename branch
• Checkout/switch branch
• Set upstream
• Prune branches

Commit Operations

• Commit (with message input)
• Amend last commit
• Cherry-pick commit
• Revert commit

Merge & Rebase

• Merge branch
• Rebase onto branch
• Abort merge/rebase
• Continue merge/rebase

Remote Operations

• Fetch (all or specific remote)
• Pull (with options)
• Push (with options)
• Add remote
• Remove remote

Stash Operations

• Stash changes
• Pop stash
• Apply stash
• Drop stash
• List stashes

Tag Operations

• Create tag
• Delete tag
• Push tags

Worktree Operations

• Create worktree
• Remove worktree
• List worktrees

Guided Workflows

• Step-by-step parameter collection
• Validation at each step
• Preview of command before execution
• Cancel/back navigation
• Help text for each option

Search & Quick Access

• Fuzzy search for commands
• Recent commands list
• Favorite commands
• Keyboard navigation

UI Design

• Modal dialog with search box
• Categorized command list
• Step-by-step wizard for complex commands
• Command preview panel
• Output/result display

Configuration Options

• Show recent commands count
• Favorite commands list
• Default options per command
• Confirmation prompts toggle

Related Issues (Dedicated Tool Windows)

The following issues provide dedicated UI experiences for operations also available in the Command Palette:

• feat(stash): add stash management features #11 - Stash management tool window (rich UI for stash operations)
• feat(views): add Branches management tool window #22 - Branches management tool window (rich UI for branch operations)
• feat(views): add Tags management tool window #23 - Tags management tool window (rich UI for tag operations)
• feat(worktrees): add Git Worktrees support #27 - Worktrees tool window (rich UI for worktree operations)
• feat(repo): add repository management features #10 - Repository management (remote operations)

The Command Palette complements these tool windows by providing quick keyboard-driven access. Users can choose their preferred workflow.

Acceptance Criteria

• All listed Git operations are available
• Search finds commands quickly
• Guided workflows collect parameters correctly
• Commands execute successfully
• Error handling provides useful feedback
• Recent/favorite commands work