feat: sticky feedback bar with CTA in anchor modal

[raifdmueller]

Summary

Moves the Vote/Discuss buttons from the scrollable content area to a sticky footer bar at the bottom of the anchor modal — always visible without scrolling.

Changes

• Sticky footer: Vote and Discuss buttons in a fixed bar at the modal bottom
• CTA text: "Is this anchor useful?" / "Ist dieser Anker hilfreich?" next to the buttons
• Comments: Remain in the scrollable content area above
• Responsive: CTA text hidden on mobile (buttons still visible)

Before/After

Before: Vote/Discuss buttons at the very bottom of the content, hidden until you scroll down

After:

┌─ Modal Header ──────────────────────┐
│ ⚓ arc42                        [X] │
├─────────────────────────────────────┤
│                                     │
│  (scrollable anchor content)        │
│                                     │
│  (comments if any)                  │
│                                     │
├─────────────────────────────────────┤
│ Is this anchor useful?  [Vote] [💬] │
└─────────────────────────────────────┘

Test plan

• Feedback bar visible immediately when modal opens
• Bar stays fixed while scrolling content
• Vote/Discuss links correct per anchor
• CTA hidden on small screens, buttons still visible
• DE: "Ist dieser Anker hilfreich?"
• All 87 unit tests pass

🤖 Generated with Claude Code

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Review profile: CHILL

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Run ID: 4d66e9e5-a56c-4f96-9091-37d65d5d41b4

📥 Commits

Reviewing files that changed from the base of the PR and between fe4ffdd and a4c5ae2.

📒 Files selected for processing (4)

• website/src/components/anchor-modal.js
• website/src/styles/main.css
• website/src/translations/de.json
• website/src/translations/en.json

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