docs(26-03): complete discovery landing page plan

- 26-03-SUMMARY.md: landing page rewrite and PublicSetupCard enhancement
- STATE.md: advanced to phase complete, recorded decisions
- ROADMAP.md: phase 26 marked complete (3/3 plans)
- REQUIREMENTS.md: DISC-01 through DISC-05 marked complete

.planning/STATE.md

@@ -2,15 +2,15 @@
 gsd_state_version: 1.0
 milestone: v2.1
 milestone_name: Public Discovery
-status: executing
-stopped_at: Completed 26-02-PLAN.md
-last_updated: "2026-04-10T12:59:46.313Z"
+status: verifying
+stopped_at: Completed 26-03-PLAN.md
+last_updated: "2026-04-10T13:02:50.041Z"
 last_activity: 2026-04-10
 progress:
   total_phases: 6
-  completed_phases: 2
+  completed_phases: 3
   total_plans: 7
-  completed_plans: 6
+  completed_plans: 7
   percent: 0
 ---
 
@@ -27,7 +27,7 @@ See: .planning/PROJECT.md (updated 2026-04-09)
 
 Phase: 26 (discovery-landing-page) — EXECUTING
 Plan: 3 of 3
-Status: Ready to execute
+Status: Phase complete — ready for verification
 Last activity: 2026-04-10
 
 Progress: [░░░░░░░░░░] 0%
@@ -71,6 +71,8 @@ v2.1 decisions:
 - [Phase 26-discovery-landing-page]: Composite cursor for setups uses itemCount_id format filtered post-query in JS for simplicity with grouped SQL
 - [Phase 26-discovery-landing-page]: No cursor pagination for getTrendingCategories — bounded small list, simple limit is sufficient
 - [Phase 26]: discoveryRoutes registered with browseTier rate limiting (120 req/min) for all GET discovery endpoints
+- [Phase 26-discovery-landing-page]: PublicSetupCard itemCount/creatorName fields are optional for backward compatibility with users/$userId usage
+- [Phase 26-discovery-landing-page]: Discovery sections hide entirely (return null) when not loading and data is empty — avoids empty grid layouts
 
 ### Pending Todos
 
@@ -82,6 +84,6 @@ None.
 
 ## Session Continuity
 
-Last session: 2026-04-10T12:59:46.310Z
-Stopped at: Completed 26-02-PLAN.md
+Last session: 2026-04-10T13:02:50.039Z
+Stopped at: Completed 26-03-PLAN.md
 Resume file: None