Implement task detail view (GET /tasks/:id)

Add task detail page:

• GET /tasks/:id route with Capture for task ID
• Show full task info: title, type, status, priority, namespace, parent, dependencies, description, timestamps
• Dependencies shown as clickable links to their detail pages
• Status update form: dropdown with all statuses + Submit button
• If task has parent, show link to parent
• If task is epic, show list of child tasks
• 404 page if task not found