Implement Todoist write operations - Handlers & UI (Part 2)

Complete Todoist task creation and completion functionality:

Handlers:
- Update aggregateData to fetch and populate Projects
- Add HandleCreateTask: creates task, refreshes list, re-renders
- Add HandleCompleteTask: marks task complete, returns empty
- Both handlers pass Projects to template for dropdown

Routes:
- Register POST /tasks for task creation
- Register POST /tasks/complete for task completion

UI (todoist-tasks.html):
- Add Quick Add form with collapsible details element
- Project selector dropdown (iterates over .Projects)
- Content input field with validation
- HTMX integration: hx-post, hx-target, hx-swap
- Functional completion checkboxes on each task
- Remove disabled attribute from checkboxes
- Add todoist-task-item wrapper class for HTMX targeting
- Glassmorphism styling for form

Features:
- Create Todoist tasks with optional project assignment
- Mark tasks complete with single click (disappears)
- Real-time task list updates without page reload
- Seamless HTMX partial updates

All tests pass. Full Todoist write operations now live in UI!

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

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