fix: template, post creation validation

[bankosegger]

✅ Checklist

• I have followed every step in the contributing guide
• The PR title follows the convention conventional-commit
• I performed a functional test on my final commit

---

Changelog

Frontend: Disable submit button when the input field is empty to prevent validation errors

• Added name.length === 0 check to disabled attribute in both post components (post.tsx and post-tw.tsx)

Backend: Strengthen validation to prevent empty/whitespace-only submissions

• Added .trim() to Zod schema validation in all 6 post router variants to strip whitespace and reject empty strings
• Ensures validation is consistent between frontend and backend

This fixes the issue where users could submit empty input to the form, resulting in backend validation errors.

💯

[changeset-bot]

🦋 Changeset detected

Latest commit: d12a8ac

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
create-t3-app	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Review	Updated (UTC)
create-t3-app	Ready	Preview, Comment	Dec 25, 2025 5:22pm