feat: improve worktree UX

[danielss-dev]

Summary

• Stabilize repo/workspace naming across worktree tabs, rail, switcher, headers, recents, and file breadcrumbs.
• Redesign the Worktrees overview as an AI-agent dashboard with lazy row stats, summary metrics, clearer badges, and stable row ordering.
• Improve New worktree copy/defaults for isolated agent tasks.
• Avoid the Worktrees list row-jump when opening a worktree review.
• Record the shipped behavior in TASKS, ROADMAP, README, and durable learnings.

Walkthrough

worktree_ux_dashboard_review_verified.mp4

Testing

• bun --cwd ui run test -- repoIdentity.test.ts (environment warning: bun not installed)
• pnpm --filter ./ui test -- repoIdentity.test.ts
• pnpm --filter ./ui exec tsc --noEmit
• pnpm --filter ./ui test
• pnpm --filter ./ui build
• Manual Tauri walkthrough: Worktrees dashboard -> focus dirty linked worktree -> Review opens worktree-ux-demo.txt.

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