fix: hide today's word on archive, fix unicode word-image 403s

[Hugo0]

Summary

• Spoiler prevention: Today's word on /{lang}/words now shows a mystery card with ? tiles and a "Play to reveal!" CTA linking to the game, instead of exposing the word, definition, and stats
• API hardening: The /api/{lang}/words endpoint now returns null for today's word/definition/stats to prevent spoilers even via direct API access
• Unicode fix: word-image and definition endpoints now normalize the URL word parameter to NFC form, fixing 403 "Not a valid daily word" errors for words with diacritics (ö, é, ü, etc.)

Test plan

• /en/words — first card should show ????? tiles with green "Play to reveal!" text
• /de/words — same mystery card for today's word
• Clicking mystery card navigates to /{lang} game page
• /de/word/1729 (past word with umlaut) — image should load
• /api/de/word-image/schön?day_idx=1729 — should return 200 (not 403)
• /en/words page 2+ — no mystery card (all past words)

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 20a687dc-42e6-41bc-8e68-c4175d83b520

📥 Commits

Reviewing files that changed from the base of the PR and between eff883d and bb3ea77.

📒 Files selected for processing (5)

• pages/[lang]/words.vue
• server/api/[lang]/definition/[word].get.ts
• server/api/[lang]/word-image/[word].get.ts
• server/api/[lang]/words.get.ts
• tests/api.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/words-archive-spoiler-and-unicode

📝 Coding Plan

• Generate coding plan for human review comments

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