Add theme toggle (light/dark) to Contact page navbar with persistent preference

[kalyaniugale]

Which issue does this PR close?

• Closes Light mode toggle not available on Contact page #731

---

Rationale for this change

The Contact page already included dark-mode styles ([data-bs-theme="dark"] and body.dark) but had no UI to switch themes. Adding a small, unobtrusive toggle improves accessibility and user control, and persists the preference across sessions.

---

What changes are included in this PR?

• contact.html

  • Added a Theme Toggle button to the navbar (uses Bootstrap Icons).

  • Added a small theme management script that:

    • toggles data-bs-theme between light and dark
    • syncs body.dark (to activate existing contact.css dark rules)
    • persists choice in localStorage
    • calls the existing updatelogo() so the footer logo swaps with the theme

  • No structural or styling changes beyond the above.

Implementation notes

• Initial theme is chosen from localStorage (if set) or falls back to OS preference (prefers-color-scheme), then to light.
• Toggle button icon/label auto-update (bi-moon-stars ↔ bi-sun, “Dark” ↔ “Light”).
• The script is self-contained and only touches the Contact page.

---

Are these changes tested?

Manual verification:

• ✅ Initial load respects saved preference in localStorage.
• ✅ If no saved preference, initial theme follows OS (prefers-color-scheme) fallback.
• ✅ Toggling switches both [data-bs-theme] and body.dark.
• ✅ Footer logo updates via updatelogo().
• ✅ Works with existing Bootstrap 5.3.6 + Bootstrap Icons CDN.
• ✅ No console errors when footer isn’t yet injected (guarded updatelogo() call).

---

Are there any user-facing changes?

• Yes. A new Theme button appears on the Contact page navbar:

  • Light/Dark theme can be toggled.
  • Preference is remembered across visits.
  • No layout or content changes otherwise.

No breaking changes.

---

Screenshots

[github-actions]

Thanks for creating a PR for your Issue! ☺️

We'll review it as soon as possible.
In the meantime, please double-check the file changes and ensure that all commits are accurate.

If there are any unresolved review comments, feel free to resolve them. 🙌🏼

[netlify]

✅ Deploy Preview for growcraftt ready!

Name	Link
🔨 Latest commit	5c397c8
🔍 Latest deploy log	https://app.netlify.com/projects/growcraftt/deploys/68df7f233d89ce0008503da5
😎 Deploy Preview	https://deploy-preview-840--growcraftt.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[gyanshankar1708]

@kalyaniugale Ressolve conflict