Add delete worktree action to branch-folder chooser

[seankearon]

Summary

Adds a Delete worktree & branch action to the branch-folder chooser dialog in branch-only mode. When a linked worktree is located on a branch, users can now delete the worktree, its local branch, and the corresponding remote branch (if it exists) directly from the UI.

Key Changes

• New deletion workflow: Added DeleteWorktreeDialog confirmation dialog that warns about uncommitted changes, orphaned commits, and remote branch status before proceeding with deletion.

• Git service enhancements: Extended GitService with new methods:

  • IsLinkedWorktreeAsync() — detects linked worktrees vs. main tree
  • WorktreeRemoveAsync() — removes a worktree (with force option for dirty trees)
  • DeleteLocalBranchAsync() / DeleteRemoteBranchAsync() — branch deletion
  • CountOrphanedCommitsAsync() — counts commits unique to a branch

• Opener service integration: Added BuildWorktreeDeletionAsync() and DeleteWorktreeAsync() to orchestrate the full deletion flow, gathering deletion metadata and executing the git operations.

• UI updates:

  • Enhanced ChooserDialog with optional delete button (shown only when a delete label is provided)
  • Modified MainWindow.ChooseOpenTargetAsync() to detect linked worktrees and offer delete action for non-default branches
  • Added DeleteWorktreeDialog with visual warnings for dirty worktrees and orphaned commits
  • Updated ChooserViewModel to support the delete button

• Safety guards:

  • Delete action only offered for linked worktrees (not the main tree)
  • Default branches (main/master) are protected — no delete option offered
  • Confirmation dialog shows worktree path, branch name, remote status, and data-loss warnings
  • Failed remote deletes don't block local cleanup; partial success is reported

• Test coverage: Comprehensive end-to-end tests covering:

  • Successful deletion of pushed branches
  • Declining confirmation (nothing deleted)
  • Unpushed branches (local-only deletion)
  • Dirty worktrees (forced removal)
  • Worktrees with no solution files
  • Protected default branches
  • Failed remote deletes with successful local cleanup
  • Multi-folder scenarios (deleting from one clone doesn't affect others)

Implementation Details

• The delete action is resolved early in the chooser flow so it's available even when there are no solutions to open (folder-only editors or worktrees without .sln files).
• Deletion runs from the clone's main tree to avoid standing inside the worktree being removed.
• Remote branch deletion is attempted but doesn't fail the operation if it's already gone — the local cleanup is the critical part.
• Orphaned commit detection uses git rev-list to identify unpushed, unmerged work that would be lost.

https://claude.ai/code/session_019JuVApu68rjnvBUEY5NCBV