No favicon, app icons, or PWA manifest

[Harsh-goswami-103]

Problem

No public/ directory, no favicon, no apple-touch-icon, and no web app manifest. The browser tab and bookmarks fall back to a default/blank icon.

Impact

• Unbranded tab/bookmark/home-screen icon; looks unfinished.
• No installability / theme-color metadata.

Acceptance Criteria

• Add favicon + apple-touch-icon + manifest.webmanifest with theme-color.
• Reference them from index.html.

Priority

Low

[Harsh-goswami-103]

/assign

[github-actions]

✅ Assigned @Harsh-goswami-103