enhance: update combobox label in 'reporting' page

[superb-sushi]

Description

This PR enhances the user experience on the public absence reporting page by enriching the Combobox dropdown choices. It adds contextual subject descriptions alongside teacher names, making it easier for teachers to identify themselves should there be other teachers with identical or similar names.

Key Changes

1. Data Fetching: Updated the Prisma query on the server side (page.tsx) to pull the subjects relation/field for the dropdown data set.
2. UI Label Enrichment: Adjusted the frontend Combobox mapping options to concatenate the teacher's full name with their respective assigned subjects, matching the specification: TeacherFullName (Subject 1, Subject 2, ...).
3. Data Integrity Maintained: Verified that this is purely a visual enhancement. The Combobox option value attribute continues to map directly to the clean database primary key ID (teacher.id).

Manual Verification Steps

1. Navigate to /demo/reporting as an unauthenticated visitor.
2. Click on the Your name dropdown.
3. Observe that teachers are now listed with their subjects appended within parentheses.
4. Select a teacher, fill in all other relevant information, and submit the form.
5. Observe that the form submits successfully.

Fixes #232

[vercel]

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Project	Deployment	Actions	Updated (UTC)
relief-teacher-planning	Ready	Preview, Comment	May 21, 2026 3:40am