fix: cap year at 4 digits and prevent crash on invalid datetime input

[aseckin]

Fixes #3640

Summary

• Add max="9999-12-31[T23:59]" to datetime-local inputs so years cannot exceed 4 digits.
• Drop the redundant format(localValue, formatStr) call in the render path — localValue is already the formatted string from the effect, and re-formatting a raw user string with an out-of-range year threw RangeError: Invalid time value mid-render, which the global error boundary caught as a page crash.

Test plan

• Open question creation form, try to type a 5+ digit year — browser should cap at 4 digits.
• Confirm the page no longer crashes when an out-of-range date is briefly entered.

Generated with Claude Code

Summary by CodeRabbit

• Bug Fixes
  • Improved datetime input handling by ensuring the displayed default value uses the correctly formatted local datetime.
  • Prevented unnecessary reformatting that could cause inconsistencies in date and time displays.

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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 2026-07-17T13:32:27Z