fix: associate trim validation errors with form fields

[srinidhi-2006-bit]

Description

Improved accessibility of trim validation fields by properly associating validation errors with their corresponding form inputs.

Changes Made

• Added role="alert" to trim validation error messages
• Verified aria-describedby links inputs to their error messages
• Verified aria-invalid is set on invalid inputs
• Ensured screen readers can announce validation errors correctly

Accessibility Improvements

• Error messages are programmatically associated with form fields
• Invalid fields expose their state through aria-invalid
• Validation errors are announced using role="alert"

Related Issue

Fixes #172

Type of Contribution

• Bug fix
• New feature
• Documentation update
• Refactor
• GSSoC contribution

Participant Info

• GitHub username: srinidhi-2006-bit
• Contribution level (Beginner)

Screen Recording

Recording / Loom link:

reframe_trim.mp4

Checklist

• I have read the contribution guidelines
• My changes follow the project structure
• I have tested my changes in Chrome, Firefox, and Safari
• bun run lint passes (no ESLint errors)
• bunx tsc --noEmit passes (no TypeScript errors)
• New interactive elements have aria-label / accessible names
• No console.log statements left in
• This PR is related to a valid issue
• Screen recording attached above (required for UI/feature/design changes)

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[github-actions]

👋 Thanks for your PR, @srinidhi-2006-bit!

Welcome to Reframe — a browser-based video editor built for everyone 🎬

🟠 GSSoC'26 PR detected — thanks for contributing under GirlScript Summer of Code 2026!

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• Linked the issue this PR closes (e.g. Closes #123)
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[github-actions]

✅ PR Format Check Passed — @srinidhi-2006-bit

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[srinidhi-2006-bit]

Hi @magic-peach

I've completed the accessibility fix for Issue #172.

Changes made

• Added role="alert" to trim validation error messages
• Verified aria-describedby correctly links inputs to their error messages
• Verified aria-invalid is set on invalid fields

Validation

• CI build passed ✅
• Lint passed ✅
• Type check passed ✅
• Screen recording attached ✅

Please let me know if any further changes are needed. Thank you for your review!