docs(ui): cookie-rendered sidebar state, data-collapsed CSS, working overview links + link-checker gate

Three problems, one root cause each:

1. Sidebar jump: the server rendered its own default (current section
   open, rest collapsed) and restoreDocsNav corrected it after paint —
   open-then-close. Fix: persistence moved server-side. toggleCollapsible
   now writes a docs_nav cookie (strictly-necessary UI state, no
   identifiers, SameSite=Lax); ApplyNavOverrides merges it into the nav
   before render, so first paint IS the visitor's state. The post-paint
   restore is deleted.

2. Arrows out of sync / double-click: two visibility mechanisms
   disagreed. There was NO data-collapsed CSS at all — collapsed sections
   were only ever hidden by JS after paint, and the arrow rotation came
   from a different (server) state. Now: style.css hides on
   [data-collapsed=true] (single source of truth, server-rendered),
   applyCollapsed sets only the attribute, arrows rotate from the same
   merged value. Live check: 37/37 collapsibles arrow-consistent.

3. api-reference.md links: all 20+ quick links were directory-style
   (authentication/ etc.) that 404 on the docs site, plus stale targets
   (books/, ../collections-api.md, websocket 'coming soon'). Rewritten to
   real per-file links — all 9 unique targets return 200 live. Same rot
   fixed in admin/hash-conflicts.md, development.md, android-app.md,
   create_media_item.md, koreader-protocol.md; docs/index.md redirected
   from the deleted collections-api monolith (stale 530-line duplicate of
   the gated api/collections docs — deleted, per the WO2 doctrine).

New gate: TestDocsRelativeLinks walks docs/developer/** and fails make
test on any relative link that is directory-style or unresolvable —
overview links can never silently rot again.

docs/index.md

@@ -30,7 +30,7 @@ Complete guide to Bookhoard documentation. Find what you need quickly.
 - **API Documentation**
   - [Complete API Reference](developer/api-reference.md) - Monolithic REST API reference (1,300+ lines)
   - [Split Endpoint Docs](developer/api/api-reference.md) - Individual endpoints with interactive API Explorer
-  - [Collections API](developer/collections-api.md) - Collections management API
+  - [Collections API](developer/api/collections/list_collections.md) - Collections management API
   - [Admin API](developer/api/admin/) - User management (admin operations)
   - [Media Items API](developer/api/media-items/) - Media item operations including bulk operations and downloads
   - [Devices API](developer/api/devices/) - Device sync and shelf management
@@ -121,7 +121,7 @@ Complete guide to Bookhoard documentation. Find what you need quickly.
 ### Integrate with Bookhoard API
 
 1. Start with [API Reference](developer/api-reference.md)
-2. Explore [Collections API](developer/collections-api.md)
+2. Explore [Collections API](developer/api/collections/list_collections.md)
 3. Review [WebSocket API](developer/websocket-api.md)
 4. Test with [bruno/](../bruno/) collections