Add 200-outcome limit guidance to discrete question error messages and guidelines

[SylvainChevalier]

Closes #4410

Summary

• Updated step validation error message across all locales (en, es, cs, zh, zh-TW, pt) to inform users that questions with more than 200 possible outcomes should use the continuous question type
• Added guidance about the 200-outcome limit for discrete questions to the question writing guidelines page

Test plan

• Verify error message appears when creating a discrete question with step < 1/200 of the range
• Check the question writing guidelines page shows the new guideline

Generated with Claude Code

[SylvainChevalier]

@claude also change the check for number of bins during discrete question creation.

[claude]

Claude finished @SylvainChevalier's task in 6m 25s —— View job

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Added backend validation check for discrete question bin limit

• Gather context and find the bin validation check
• Add backend validation check for discrete question bin limit in serializer
• Commit and push changes

Added server-side validation in QuestionWriteSerializer.validate() (questions/serializers/common.py) to enforce the 200-outcome limit for discrete questions. Previously this limit was only enforced on the frontend in numeric_question_input.tsx. The backend now rejects discrete questions with inbound_outcome_count > 200 and returns a clear error message suggesting the use of a continuous question type instead.

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[github-actions]

Cleanup: Preview Environment Removed

The preview environment for this PR has been destroyed.

Resource	Status
🌐 Preview App	Deleted
🗄️ PostgreSQL Branch	Deleted
⚡ Redis Database	Deleted
🔧 GitHub Deployments	Removed
📦 Docker Image	Retained (auto-cleanup via GHCR policies)

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Cleanup triggered by PR close at 2026-02-25T13:50:57Z