Add label field to tasks

[Copilot]

Tasks lacked any tagging/categorization mechanism. This adds an optional free-text label field (e.g. "Work", "Personal") to tasks.

Data layer

• tasks table: new label TEXT DEFAULT '' column in schema; ALTER TABLE migration for existing DBs (only logs non-duplicate errors)
• createTask and updateTask signatures extended with label parameter

API

• POST /api/tasks and PUT /api/tasks/:id accept and validate label (optional string, max 50 chars)
• label included in POST response body

UI

• Label input added to the Add Task form
• Label rendered as a styled badge on each task card (hidden when empty)

// Create a task with a label
POST /api/tasks
{ "title": "Fix bug", "priority": "high", "label": "Work" }
// → { "id": 1, ..., "label": "Work" }

Tests

• Updated all mock signatures for createTask/updateTask
• 4 new label-specific test cases added

Original prompt

create a label feature

Created from VS Code.

---

🔒 GitHub Advanced Security automatically protects Copilot coding agent pull requests. You can protect all pull requests by enabling Advanced Security for your repositories. Learn more about Advanced Security.