Sojan Jose b2cb3717e5 fix: Replace default Rails error pages with custom designs (#13514)
## Summary

- Replace generic Rails 404, 422, and 500 error pages with
custom-designed pages
- Each page features a prominent gradient error code, clean typography,
and a "Back to home" CTA
- Full dark mode support via `prefers-color-scheme` media query  
- Mobile responsive design  
- No external dependencies (self-contained static HTML, works even when
Rails is down)
- No logo/branding to ensure compatibility with custom-branded
self-hosted instances

---

## Before (default Rails 404)

<img width="2400" height="1998" alt="old-404"
src="https://github.com/user-attachments/assets/c5f044c4-aab6-40e9-aa11-6096ed9d2b42"
/>

---

## After

### Light mode

| 404 | 422 | 500 |
|-----|-----|-----|
| <img width="600" alt="new-404-light"
src="https://github.com/user-attachments/assets/1826c812-0eb9-4219-bdd2-026c54b53123"
/> | <img width="600" alt="new-422-light"
src="https://github.com/user-attachments/assets/d72ffdbf-b61e-4f53-a16b-4ee81103124f"
/> | <img width="600" alt="new-500-light"
src="https://github.com/user-attachments/assets/81bbdb24-bfe7-43a1-b584-f37f71e3bded"
/> |

---

### Dark mode

| 404 | 422 | 500 |
|-----|-----|-----|
| <img width="600" alt="new-404-dark"
src="https://github.com/user-attachments/assets/bd323915-bfb9-48c1-885d-96ff263b4ae0"
/> | <img width="600" alt="new-422-dark"
src="https://github.com/user-attachments/assets/dcb08eca-aee5-4e36-9690-f44da13e8d88"
/> | <img width="600" alt="new-500-dark"
src="https://github.com/user-attachments/assets/538c3c2c-b9dc-406c-9932-ff8897b64790"
/> |

---

## Test plan

Easier way to verify:

- [ ] Visit `/404.html` directly to verify the 404 page  
- [ ] Visit `/422.html` directly to verify the 422 page  
- [ ] Visit `/500.html` directly to verify the 500 page  

Full verification:

- [ ] Visit a non-existent route in production mode to verify the 404
page
- [ ] Trigger a 422 error (e.g., invalid CSRF token) to verify the 422
page
- [ ] Trigger a 500 error to verify the 500 page  
- [ ] Toggle system dark mode and verify all pages render correctly  
- [ ] Test on mobile viewport widths
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Chatwoot

The modern customer support platform, an open-source alternative to Intercom, Zendesk, Salesforce Service Cloud etc.

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Chatwoot is the modern, open-source, and self-hosted customer support platform designed to help businesses deliver exceptional customer support experience. Built for scale and flexibility, Chatwoot gives you full control over your customer data while providing powerful tools to manage conversations across channels.

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