fix: Add descriptive alt text to project card images for Accessibility

[Kinara2020]

Description

Project card images in the web app were missing descriptive alt attributes. Images had alt="" which fails WCAG 2.1 accessibility standards and makes the site unusable for screen reader users.

This PR adds meaningful alt text to all project card banner images dynamically using the project title.

Linked Issue

Fixes #1222

Changes Made

•	Updated search.js — changed img.alt = "" to img.alt = project.title + " project preview"
•	Added forEach loop to set alt on all .card-banner images using their card’s h3 title text

Type of Change

•	Bug fix

Testing

•	Tested locally at http://127.0.0.1:5500/web-app/index.html
•	Verified via DevTools Elements tab — alt="Simon Says project preview" visible on card images
•	No console errors introduced

Checklist

•	My code follows the project’s coding style
•	I have performed a self-review of my code
•	I am submitting PR from a dedicated branch, not main
•	I have linked the relevant issue

Screenshots / Screen Recording

✅ Before: alt="" on all card banner images
✅ After: alt="Simon Says project preview" — descriptive alt text visible in DevTools

[vercel]

@kinara2086 is attempting to deploy a commit to the Anuj's projects Team on Vercel.

A member of the Team first needs to authorize it.

[Kinara2020]

Reviewed

[Kinara2020]

Hello @steam-bell-92
Would like to get feedback upon and would request to add appropriate gssoc labels.

[Kinara2020]

The CI failure in modal.spec.js:4:3 is unrelated to this PR. It tests Modal Lifecycle & Focus Trapping behaviour which is not affected by the alt text changes made in this PR.
15 tests passed successfully.

[github-actions]

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