Remove priority and category from tasks

[Copilot]

priority and category fields on tasks added complexity without consistent usage. This removes them entirely from the data model, UI, logic, and tests.

Data model (storage.ts)

• Dropped priority and category from the Task interface
• Removed priority: 'medium' default in addTask
• updateCategory / deleteCategory no longer propagate to tasks (habits and finance unaffected)

App logic (app.ts)

• Removed category filter dropdown logic and group-by (priority/category) from filterTasks
• Deleted updateCategoryFilter — no longer needed
• Removed category/priority from task modal (open, save), repeated task creation, and project detail task list
• Dropped categoryFilter and groupBy from filter persistence (saveFilterSettings / loadFilterSettings / resetFilters)
• Upcoming tasks now sort by due date then title (replaces priority tiebreaker)

UI (index.html)

• Removed category filter <select>, group-by <select>, and task form fields for category and priority

Tests (storage.test.ts)

• Removed priority from addTask calls and assertions
• Category propagation tests updated to use habits only

E2E tests (e2e/app.spec.ts)

• Removed the task group by describe block (group by priority, group by category, revert to default grouping, show group by dropdown)
• Removed should persist groupBy filter across page reloads test
• Removed groupBySelect interactions and assertions from the reset filters test
• Removed stale priority fields from task objects in dashboard tests

Original prompt

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This section details on the original issue you should resolve

<issue_title>Remove priority and category from tasks</issue_title>
<issue_description>Removing the priority and category fields from tasks will simplify the app. These fields are not being used consistently by users

Associated tests will need to be updated</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Remove priority and category from tasks #63

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[JoeProgrammer88]

We need to remove the e2e tests relating to the task grouping dropdown since the category and priority are being removed

[Copilot]

We need to remove the e2e tests relating to the task grouping dropdown since the category and priority are being removed

Done in 508bff1. Removed the entire task group by describe block (group by priority, group by category, revert to default grouping tests), the should persist groupBy filter across page reloads test, cleaned up groupBySelect assertions from the reset filters test, and removed stale priority fields from task objects in the dashboard tests.

[JoeProgrammer88]

Tests managing tasks must have the task priority removed

[Copilot]

Tests managing tasks must have the task priority removed

Done in 42eb345. Removed the selectOption('#taskPriority', 'high') line from the should create a new task e2e test.