docs: redesign homepage, search modal, and navbar

[jessiemongeon1]

Summary

• Redesign landing page with product-centric cards (Data Storage, Walrus Memory, Walrus Console, Walrus Skills) and a prominent search bar
• Rewrite search modal to match Sui docs style: inline search input, plain text tabs, "Ask Walrus AI" banner that opens Kapa sidebar with the current query
• Add Kapa sidebar mode (data-view-mode=sidebar) with a client module that detects open/close and shifts doc content to accommodate the panel
• Slim down navbar from 68px to 52px with tighter spacing and font sizes

Test plan

• pnpm build passes
• Verify homepage layout: search bar → product cards → footer
• Verify search modal opens from homepage and navbar, renders above all content
• Verify "Ask Walrus AI" banner in search modal closes modal and opens Kapa sidebar
• Verify Kapa sidebar shifts doc content on doc pages but not on landing page
• Verify navbar is compact and all links/buttons fit at common viewport widths
• Test on mobile viewports

🤖 Generated with Claude Code

[github-actions]

PR Preview Action v1.8.1
🚀 View preview at https://MystenLabs.github.io/walrus/pr-preview/pr-3474/
Built to branch gh-pages at 2026-06-25 21:27 UTC. Preview will be ready when the GitHub Pages deployment is complete.

[github-actions]

📋 afdocs check results

URL: https://MystenLabs.github.io/walrus/pr-preview/pr-3474/

Running checks on mystenlabs.github.io/walrus/pr-preview/pr-3474/...

Agent-Friendly Docs Check: https://MystenLabs.github.io/walrus/pr-preview/pr-3474/
Timestamp: 6/25/2026, 9:31:27 PM

content-discoverability
  ✓ llms-txt-exists: llms.txt found at https://MystenLabs.github.io/walrus/pr-preview/pr-3474/llms.txt
  ✓ llms-txt-valid: llms.txt follows the proposed structure (H1, blockquote, heading-delimited link sections)
  ⚠ llms-txt-size: llms.txt is 55,045 characters (between 50,000 and 100,000; consider splitting)
      Learn more: https://agentdocsspec.com/spec/#llms-txt-size
  ○ llms-txt-links-resolve: llms.txt contains 161 links, but none are under /walrus/pr-preview/pr-3474
  ○ llms-txt-links-markdown: llms.txt contains 161 links, but none are under /walrus/pr-preview/pr-3474
  ✓ llms-txt-directive-html: llms.txt directive found in HTML of all 168 pages, near the top of content
  ✗ llms-txt-directive-md: Could not fetch markdown for any of 168 pages; 168 had no markdown version
      Learn more: https://agentdocsspec.com/spec/#llms-txt-directive-md

markdown-availability
  ✗ markdown-url-support: No pages support .md URLs (0/168 tested)
      Learn more: https://agentdocsspec.com/spec/#markdown-url-support
  ✗ content-negotiation: Server ignores Accept: text/markdown header (0/168 pages return markdown)
      Learn more: https://agentdocsspec.com/spec/#content-negotiation

page-size
  ✓ rendering-strategy: All 168 pages contain server-rendered content
  ○ page-size-markdown: Skipped: dependency check did not pass
  ✓ page-size-html: All 168 pages under 50K chars (median 42K HTML → 8K markdown (80% boilerplate))
  ✗ content-start-position: 25 of 168 pages have content starting past 50% (worst 71%)
      Learn more: https://agentdocsspec.com/spec/#content-start-position

content-structure
  ✓ tabbed-content-serialization: 53 tab group(s) across 30 of 168 pages; all serialize under 50K chars
  ✓ section-header-quality: 2 page(s) with tab headers checked; headers include variant context
  ✓ markdown-code-fence-validity: All 0 code fences properly closed across 1 pages

url-stability
  ✓ http-status-codes: All 168 pages return proper error codes for bad URLs
  ✓ redirect-behavior: No redirects detected across 168 pages

observability
  ✗ llms-txt-coverage: llms.txt covers 0/160 sitemap doc pages (0%); 160 missing
      Learn more: https://agentdocsspec.com/spec/#llms-txt-coverage
  ○ markdown-content-parity: Skipped: dependency check did not pass
  ✓ cache-header-hygiene: All 169 endpoints have appropriate cache headers

authentication
  ✓ auth-gate-detection: All 168 pages are publicly accessible
  ○ auth-alternative-access: All docs pages are publicly accessible; no alternative access paths needed

Summary
  12 passed, 1 warnings, 5 failed, 5 skipped (23 total)

Full spec: https://agentdocsspec.com/spec/