feat(a11y): add ARIA labels to navigation and polite announcements to…

[ayushhh101]

… notifications

Description

• Add aria-label="Open menu" to the navigation hamburger button.
• Add role="navigation" and aria-label="Primary" to the sidebar .
• Add aria-live="polite" to the notifications list wrapper for screen-reader announcements.
• No visual changes; improves keyboard/SR accessibility and landmark semantics.

Changed files:

1. src/components/Navigation.jsx
2. src/components/NotificationList.jsx

Semver Changes

• Patch (bug fix, no new features)
• Minor (new features, no breaking changes)
• Major (breaking changes)

Issues

Closes #19

Checklist

• I have read the Contributing Guidelines.

[ayushhh101]

Hi @rajshekharbind — the label checker is blocking this PR. Could you please add the required labels?
Type: Easy
Semver: Minor
PR:Accept
After labels are applied, the workflow should pass (or I can re-run the checks). Thanks!