feat: limit discrete questions to 50 options max

[SylvainChevalier]

Closes #3780

• Add guideline to question-writing page about discrete question limits
• Add frontend validation in question creator to cap at 50 options
• Add backend validation in QuestionWriteSerializer to enforce the limit
• Update error messages in all translation files

Generated with Claude Code

[SylvainChevalier]

@claude the error message and guidelines should say "increase the step size or tighten the bounds"

[claude]

Claude finished @SylvainChevalier's task in 3m 25s —— View job

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Updated error messages and guidelines

• Read current error messages and guidelines text
• Update guideline text on question-writing page
• Update error message in backend serializer
• Update error messages in all translation files (en, cs, es, pt, zh, zh-TW)
• Commit and push changes

Changed "use a continuous question instead" to "tighten the bounds" across all locations:

• front_end/src/app/(main)/question-writing/page.tsx — guidelines page text
• questions/serializers/common.py — backend validation error message
• front_end/messages/en.json — English translation
• front_end/messages/cs.json — Czech translation
• front_end/messages/es.json — Spanish translation
• front_end/messages/pt.json — Portuguese translation
• front_end/messages/zh.json — Chinese (Simplified) translation
• front_end/messages/zh-TW.json — Chinese (Traditional) translation
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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch claude/issue-3780-update-guidelines-for-generating-discrete

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[github-actions]

🚀 Preview Environment

Your preview environment is ready!

Resource	Details
🌐 Preview URL	https://metaculus-pr-4336-claude-issue-3780-update-guide-preview.mtcl.cc
📦 Docker Image	ghcr.io/metaculus/metaculus:claude-issue-3780-update-guidelines-for-generating-discrete-2b77820
🗄️ PostgreSQL	NeonDB branch preview/pr-4336-claude-issue-3780-update-guide
⚡ Redis	Fly Redis mtc-redis-pr-4336-claude-issue-3780-update-guide

Details

• Commit: b2dfd4460ed647607767c9f66f4fc513df61a5a0
• Branch: claude/issue-3780-update-guidelines-for-generating-discrete
• Fly App: metaculus-pr-4336-claude-issue-3780-update-guide

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[SylvainChevalier]

@claude functionality looks good, now fix the issues from the unit tests.

[claude]

Claude finished @SylvainChevalier's task in 5m 25s —— View job

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Fixed Prettier formatting issues

• Check CI status and identify failing tests
• Fix Prettier formatting in question-writing/page.tsx
• Fix Prettier formatting in numeric_question_input.tsx
• Commit and push changes

The Frontend Checks CI job was failing due to Prettier formatting issues in two files:

1. page.tsx — Collapsed multi-line <strong> tag to a single line
2. numeric_question_input.tsx — Broke a long Math.max(3, Math.min(...)) expression across multiple lines to stay within print width

Both files now pass prettier --check.
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