Design: Redesign 404 page to match docs design system #42
Description
Summary
Redesign the 404 page to match docs visual direction and systemized styling.
Why
Current 404 page is heavily inline-styled and stylistically detached from the rest of the docs shell.
Scope
- Build 404 layout using shared classes/tokens.
- Align typography, spacing, color, and CTA treatment with docs design system.
- Ensure mobile and desktop polish.
Acceptance Criteria
- 404 page uses shared styling primitives (no major inline style blocks).
- Visual language matches the rest of docs.
- Primary recovery action (back to docs) is prominent and accessible.