# Phase 3 Step 4: Todoist Write Operations

## Goal
Implement write operations for Todoist (Create Task, Complete Task) and update the UI to support them.

## Requirements

### Backend
1.  **Models**:
    *   Add `Project` struct to `internal/models/types.go`.
    *   Add `Projects []Project` to `DashboardData`.
2.  **API (`internal/api/todoist.go`)**:
    *   Refactor `GetProjects` to return `[]models.Project`.
    *   Implement `CreateTask(content, projectID string)`.
    *   Implement `CompleteTask(taskID string)`.
    *   Refactor `baseURL` to be a struct field for testability.
3.  **Handlers (`internal/handlers/handlers.go`)**:
    *   Update `aggregateData` to fetch projects and populate `DashboardData`.
    *   Implement `HandleCreateTask`:
        *   Parse form (`content`, `project_id`).
        *   Call `CreateTask`.
        *   Return updated task list partial.
    *   Implement `HandleCompleteTask`:
        *   Call `CompleteTask`.
        *   Return empty string (to remove from DOM).

### Frontend
1.  **Template (`web/templates/partials/todoist-tasks.html`)**:
    *   Add "Quick Add" form at the top.
        *   Input: Task content.
        *   Select: Project (populated from `.Projects`).
    *   Update Task Items:
        *   Add Checkbox.
        *   `hx-post="/tasks/complete"`.
        *   `hx-target="closest .todoist-task-item"`.
        *   `hx-swap="outerHTML"`.

## Verification
*   Unit tests for API client.
*   Manual verification of UI flows.