jr: Web UI for mobile task management

Child Tasks

• t-1o2g8gugkr1.1 - Create Omni/Jr/Web.hs with Servant app skeleton and jr web command [Done]
• t-1o2g8gugkr1.2 - Implement task list view (GET /tasks) [Done]
• t-1o2g8gugkr1.3 - Implement task detail view (GET /tasks/:id) [Done]
• t-1o2g8gugkr1.4 - Implement status update endpoint (POST /tasks/:id/status) [Done]
• t-1o2g8gugkr1.5 - Implement dashboard view (GET /) [Done]
• t-1o2g8gugkr1.6 - Implement review interface (GET /tasks/:id/review with accept/reject) [Done]
• t-1o2g8gugkr1.7 - Implement ready queue view (GET /ready) [Done]
• t-1o2g8gugkr1.8 - Add task list filters (status, priority, namespace) [Done]
• t-1o2g8gugkr1.9 - Add mobile-first CSS styling [Done]
• t-1o2g8gugkr1.10 - Add stats page (GET /stats) [Done]