Feature: GenAI report page

[FadyGergesRezk]

Implement the GenAI report page, surfacing the AI-generated member progress report from the helper service.

Priority: P2

API endpoints used

Method	Endpoint	Description
GET	/helper/report/{member_id}	Generate and return a plain-text progress report for a member

Tasks

• Create the src/features/helper/ folder; this feature folder does not exist yet and must be created as part of this issue
• Add src/features/helper/api/queries.ts with a useGenerateReport hook using TanStack Query; the query should be disabled by default and triggered manually (not on mount)
• Add src/features/helper/api/query-keys.ts for structured query keys
• Add a dedicated route /helper in AppRouter.tsx with a nav link labelled "GenAI Report"
• Build a page with a member selector (dropdown populated from GET /members) and a "Generate Report" Button
• On button click, trigger the query for the selected member ID and display the returned plain-text report in a readable card or pre-formatted block
• Show a loading state while the report is being generated (the GenAI service may take several seconds)
• Show an error state if the request fails

Acceptance criteria

• Selecting a member and clicking "Generate Report" fetches and displays the plain-text report
• The button is disabled and shows a loading indicator while the request is in flight
• Selecting a different member and regenerating replaces the previous report
• If /helper/report/{member_id} is unavailable, the UI shows a clear error state