refactor: centralize TeamMember interface and add tag support

[danielmarv]

Description

This pull request refactors how team member data is modeled and displayed, centralizing the TeamMember type and adding support for a new optional tag and tag color on team member cards. It also updates the UI to display these tags and adds test coverage to ensure they are shown correctly.

Type system and data model improvements:

• Introduced a shared TeamMember interface (and supporting types) in src/types/team.ts, consolidating team member type definitions across the codebase and adding new optional fields: tag and tagColor (src/types/team.ts).
• Refactored all usages of the TeamMember type in the app to import from the new shared type, removing local interface duplications (src/app/[locale]/employees/[slug]/page.tsx, src/app/[locale]/posts/[...slug]/page.tsx, src/components/about/TeamCard.tsx) (src/app/[locale]/employees/[slug]/page.tsxL6-R6, src/app/[locale]/posts/[...slug]/page.tsxR8-L22, src/components/about/TeamCard.tsxL1-R16).

UI enhancements:

• Updated TeamCard to display a tag with a customizable background color if the tag field is present, using a default color when none is provided (src/components/about/TeamCard.tsx) [1] [2].

Data updates:

• Added tag and tagColor fields for relevant team members in both German and English team data files (src/data/de/team.json, src/data/en/team.json) [1] [2] [3] [4].

Testing:

• Added an end-to-end test to verify that team tags are visible on the About page in both locales (tests/e2e/about.spec.ts).

Type of Change

• 🐛 Bug fix
• ✨ New feature
• 📝 Documentation update
• 🎨 Style/formatting
• ♻️ Refactor
• 🔧 Configuration
• ⚡ Performance
• 🧪 Tests
• 🔐 Security

Related Issue(s)

Closes #334 #335

Changes Made

• Change 1
• Change 2
• Change 3

How to Test

1. Step 1
2. Step 2
3. Verify the expected behavior

Checklist

• Code follows project style guidelines
• Self-review conducted
• Comments added for complex logic
• Documentation updated (if needed)
• No new warnings generated
• Tests added/updated (if applicable)
• All tests passing locally

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