feat: improve accessibility for chat and portfolio components

[aryanm9026]

🔀 Pull Request

📌 Issue Reference

Closes #52

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📝 Summary

This PR improves accessibility (a11y) support for the AI Chat and Portfolio components by adding ARIA attributes and semantic roles to improve screen-reader compatibility and overall accessibility compliance.

Changes Made

• Added ARIA live regions to chat message components so new AI responses can be announced by screen readers.
• Added status announcements for streaming AI responses and feedback messages.
• Added accessible labeling to the gradient AI chat input component.
• Improved semantic structure of the portfolio holdings view by introducing appropriate table-related accessibility roles (table, rowgroup, row, and columnheader).
• Reviewed keyboard accessibility for chat interactions and verified existing Enter-key submission behavior.

Issue Fixed

This addresses accessibility concerns outlined in Issue #52 by improving ARIA compliance and screen-reader support across key user-facing components.

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📸 Screenshots (if applicable)

Accessibility Validation

• Lighthouse Accessibility Audit completed on the Chat Interface.
• Accessibility score remained stable after the changes, indicating no regressions were introduced.

Before :

After :

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✅ Checklist

• My code follows the project's coding conventions
• I have tested all impacted features
• I have updated or added necessary documentation (Not Applicable)

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🏅 Open Source Program Participation

Program Name: GSSoC 2026

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💬 Additional Notes

Accessibility Validation

• Verified keyboard navigation and interaction behavior for chat controls.
• Verified Enter-key message submission behavior.
• Verified ARIA live region announcements for assistant responses.
• Verified accessible labeling of chat input controls.

Portfolio Testing

The portfolio page is protected behind authentication and requires project-specific credentials/API configuration that are not available in the local contributor environment. Accessibility improvements for portfolio components were implemented through semantic review and code-level validation without altering existing functionality.

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