docs(20): create phase plan for FAB and full-screen catalog search

.planning/ROADMAP.md

@@ -200,7 +200,10 @@ Plans:
   3. Full-screen catalog search overlay opens from either add option
   4. Search results display catalog items with name, weight, price, owner count
   5. Tag chips filter search results
-**Plans**: TBD
+**Plans:** 2 plans
+Plans:
+- [ ] 20-01-PLAN.md — Tags endpoint, global-items route registration, UIStore extension, useTags hook
+- [ ] 20-02-PLAN.md — FabMenu component, CatalogSearchOverlay component, root layout wiring
 **UI hint**: yes
 
 ### Phase 21: Add-from-Catalog & Thread Integration
@@ -248,6 +251,6 @@ Plans:
 | 17. Object Storage | v2.0 | 0/? | Not started | - |
 | 18. Global Items & Public Profiles | v2.0 | 4/5 | Complete    | 2026-04-05 |
 | 19. Reference Item Model & Tags Schema | v2.0 | 3/3 | Complete    | 2026-04-05 |
-| 20. FAB & Full-Screen Catalog Search | v2.0 | 0/? | Not started | - |
+| 20. FAB & Full-Screen Catalog Search | v2.0 | 0/2 | Not started | - |
 | 21. Add-from-Catalog & Thread Integration | v2.0 | 0/? | Not started | - |
 | 22. Manual Entry Fallback | v2.0 | 0/? | Not started | - |