Enhancement: Comprehensive Accessibility (a11y) & Keyboard Navigation Improvements

[ArshVermaGit]

Description

This PR addresses widespread accessibility issues across the dashboard and widgets to ensure a 100% WCAG-compliant experience for keyboard and screen reader users. The ESLint accessibility plugin (eslint-plugin-jsx-a11y) was upgraded to strict mode to catch structural errors, and the entire src/components tree was audited and patched.

Resolved Issue

Resolves #1548

Changes Included

• Icon-Only Buttons: Added descriptive aria-label attributes to 70+ interactive buttons utilizing Lucide React icons (e.g., Theme toggles, close buttons, modal controls).
• Focus Rings: Globally replaced focus:outline-none and focus:ring utility classes with focus-visible:outline-none focus-visible:ring. This ensures keyboard navigators receive clear visual focus states without polluting the UI for mouse users.
• Form Controls: Fixed strict label-has-associated-control errors in ProjectMetrics.tsx, GoalTracker.tsx, and settings/page.tsx by linking labels via htmlFor/id and adding <span className="sr-only"> to custom visual toggles.
• Modals & Backdrops: Appended aria-hidden="true" to modal overlay backdrops to resolve click-events-have-key-events and no-static-element-interactions violations.
• Images: Audited all raw <img> and Next.js <Image> tags to guarantee meaningful alt text is present.

Testing & Verification

• Tested full keyboard navigation (Tab / Shift+Tab / Enter / Escape) across dashboard panels, modals, and settings.
• Verified high-contrast focus rings appear appropriately.
• npm run lint now passes with 0 accessibility warnings/errors.

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[github-actions]

GSSoC Label Checklist 🏷️

@Priyanshu-byte-coder — please apply the appropriate labels before merging:

Difficulty (pick one):

• level:beginner — 20 pts
• level:intermediate — 35 pts
• level:advanced — 55 pts
• level:critical — 80 pts

Quality (optional):

• quality:clean — ×1.2 multiplier
• quality:exceptional — ×1.5 multiplier

Validation (required to score):

• gssoc:approved — counts for points
• gssoc:invalid / gssoc:spam / gssoc:ai-slop — does not score

Type labels (type:*) are auto-detected from files and title. Review and adjust if needed.
Points formula: (difficulty × quality_multiplier) + type_bonus

[ArshVermaGit]

Hi @Priyanshu-byte-coder ! Issue #1548 has been resolved. Please review the PR and merge it under GSSoC. Thanks!