[rocketraman]

What

Adds a way to create a worktree; previously the app could only remove or prune them.

• Entry points: a Worktree hover action on local branch rows, remote branch rows, PR rows and commit rows in the log view, plus + New worktree in the Worktrees section header. The header now renders for every git repo (as "— none" when there are no worktrees) so the first one can be made.
• Dialog (Popup.NewWorktree): prefilled so Enter usually creates. Branch field depends on the source; folder defaults to a sibling <repo>-<branch-slug> (numbered when taken) and follows the branch name until edited; optional "open a terminal there". With no source it asks for a ref, suggests branches/tags, and shows what the text resolves to.
• Git (WorktreeOps.add):
  • local branch → checked out as itself
  • remote branch → --track -b <name> (editable name, defaults to the short name)
  • tag/commit → --detach, or --no-track -b <name> if a branch is named
  • PR → detached tree, then gh pr checkout N inside it; the tree is removed if gh fails
• resolve takes a typed ref in git's own order, including the short-name guess when exactly one remote has the branch.

Why the sibling default

A worktree inside the checkout shows up as untracked files and sits under the repo's file watcher (the churn WatchPolicy special-cases .claude/worktrees/ for). A sibling avoids both.

Reviewer notes

• Never --force: refusals (branch held elsewhere, branch name taken, non-empty folder) are shown inline in the dialog, which stays open until git answers.
• --quiet on worktree add is load-bearing: without it git's first stderr line is "Preparing worktree…", which firstError would surface instead of the actual fatal:.
• The Prune count is now scoped to the repo on screen, since state.worktrees may belong to another repo now that the heading renders for repos with no worktrees.

Testing

• New WorktreeCreateTest (11 tests): each source kind, refusals, resolve, refNames, defaultPath, pathProblem. Full suite 248 tests, 0 failures (from the result XML); detekt clean.
• Exercised in a headless KWin session against a scratch repo: local branch, typed remote short name, the "branch already exists" refusal, and a tag from the log view. The PR path wasn't exercised (no GitHub remote in the fixture).

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