Feature: Update role labels in UI to align with CIT terminology

[krusche]

Summary

This PR updates the display labels for roles in the UI to align with CIT terminology:

• supervisor role → now displayed as "Examiner" in the UI
• advisor role → now displayed as "Supervisor" in the UI

This is a UI-only change. The server code, database schema, API field names, and Keycloak roles remain unchanged.

Changes

UI Components (11 files)

File	Changes
ThesesTable.tsx	Column titles: "Supervisor" → "Examiner", "Advisor(s)" → "Supervisor(s)"
ThesisData.tsx	Labels: "Supervisor" → "Examiner", "Advisor" → "Supervisor" (pluralized)
TopicData.tsx	Labels: "Supervisor" → "Examiner", "Advisor" → "Supervisor" (pluralized)
TopicsTable.tsx	Column titles: "Supervisor" → "Examiner", "Advisor(s)" → "Supervisor(s)"
CreateThesisModal.tsx	Form labels: "Advisor(s)" → "Supervisor(s)", "Supervisor" → "Examiner"
PublishedTheses.tsx	Column title: "Advisor(s)" → "Supervisor(s)"
ReplaceTopicModal.tsx	Form labels: "Supervisor" → "Examiner", "Advisor(s)" → "Supervisor(s)"
CollapsibleTopicElement.tsx	Labels: "Supervisor" → "Examiner", "Advisor" → "Supervisor" (pluralized)
ResearchGroupMembers.tsx	Select options: "Advisor" → "Supervisor", "Supervisor" → "Examiner"
ThesisConfigSection.tsx	Form labels: "Advisor(s)" → "Supervisor(s)", "Supervisor" → "Examiner"
TopicAdittionalInformationCard.tsx	Section titles: "Supervisors" → "Examiners", "Advisors" → "Supervisors"

Documentation (2 files)

File	Changes
DEVELOPMENT.md	Added note about role terminology mapping and UI Label column to example users table
MAILS.md	Added note explaining the server vs UI role terminology

Technical Details

• No server changes required - API field names (supervisorIds, advisorIds) remain the same
• No database migration needed - schema is unchanged
• No Keycloak changes needed - role names remain supervisor and advisor
• Build compiles successfully
• Prettier formatting passes

Test Plan

• Browse topics page - verify "Examiner" and "Supervisor" labels appear correctly
• Create thesis modal - verify form labels show "Examiner" and "Supervisor(s)"
• Thesis config section - verify labels in thesis editing
• Research group members page - verify role select dropdown shows "Examiner" and "Supervisor"
• Landing page / Published theses - verify column headers
• Topic details page - verify role labels in additional information card

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