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/phases/26-discovery-landing-page/26-03-SUMMARY.md

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+---
+phase: 26-discovery-landing-page
+plan: "03"
+subsystem: ui
+tags: [react, tanstack-router, tanstack-query, tailwind, lucide-react]
+
+# Dependency graph
+requires:
+  - phase: 26-01
+    provides: discovery API endpoints (GET /api/discovery/setups, items, categories)
+  - phase: 26-02
+    provides: useDiscoverySetups, useDiscoveryItems, useDiscoveryCategories hooks
+provides:
+  - Landing page at / with hero, popular setups, recent items, trending categories
+  - Enhanced PublicSetupCard with itemCount and creatorName display
+affects:
+  - users/$userId (inherits PublicSetupCard enhancement)
+  - CatalogSearchOverlay (triggered from hero search bar)
+
+# Tech tracking
+tech-stack:
+  added: []
+  patterns:
+    - Empty-state hiding: sections return null when not loading and data is empty
+    - SectionSkeleton helper for consistent animate-pulse loading states
+    - Auth-conditional CTA: !!auth?.user pattern for authenticated UI branching
+
+key-files:
+  created: []
+  modified:
+    - src/client/routes/index.tsx
+    - src/client/components/PublicSetupCard.tsx
+
+key-decisions:
+  - "PublicSetupCard itemCount/creatorName fields are optional for backward compatibility with users/$userId usage"
+  - "HeroSection search bar triggers openCatalogSearch('collection') from uiStore — not a real input, just a click target"
+  - "Sections hide entirely (return null) when not loading and data is empty — avoids empty grid layouts"
+
+patterns-established:
+  - "Optional prop enhancement: add new props as optional to avoid breaking existing usages"
+  - "Discovery page sections are self-contained components that own their data-fetching logic"
+
+requirements-completed: [DISC-01, DISC-02, DISC-03, DISC-04, DISC-05]
+
+# Metrics
+duration: 2min
+completed: 2026-04-10
+---
+
+# Phase 26 Plan 03: Discovery Landing Page Summary
+
+**Discovery landing page replacing personal dashboard — hero search trigger, popular setups feed, recent catalog items, trending categories, with auth-conditional CTA and PublicSetupCard enhanced with item counts and creator names**
+
+## Performance
+
+- **Duration:** 2 min
+- **Started:** 2026-04-10T13:00:39Z
+- **Completed:** 2026-04-10T13:02:15Z
+- **Tasks:** 2 executed (+ 1 human-verify checkpoint auto-approved)
+- **Files modified:** 2
+
+## Accomplishments
+- Rewrote `src/client/routes/index.tsx` from personal dashboard (DashboardPage) to public discovery landing page (LandingPage)
+- Added hero section with "Discover Gear" heading, catalog search bar trigger (opens CatalogSearchOverlay), and conditional "Go to Collection" link for authenticated users
+- Built three content feed sections: Popular Setups (PublicSetupCard grid), Recently Added (GlobalItemCard grid), Trending Categories (pill chips)
+- Enhanced `PublicSetupCard` with optional `itemCount` and `creatorName` fields — backward compatible with existing users/$userId usage
+- Loading skeletons (animate-pulse) for all sections; sections hide when empty
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Enhance PublicSetupCard with itemCount and creatorName** - `0bf1c68` (feat)
+2. **Task 2: Rewrite index.tsx as discovery landing page** - `8aaf435` (feat)
+3. **Task 3: Visual verification checkpoint** - auto-approved (auto-chain active)
+
+## Files Created/Modified
+- `src/client/routes/index.tsx` - Completely rewritten as LandingPage with HeroSection, PopularSetupsSection, RecentItemsSection, TrendingCategoriesSection, SectionSkeleton
+- `src/client/components/PublicSetupCard.tsx` - Enhanced with optional itemCount (blue badge) and creatorName (attribution line), cursor-pointer added
+
+## Decisions Made
+- PublicSetupCard enhancement used optional props to maintain backward compat — existing `users/$userId.tsx` usage requires no changes
+- Search bar is a styled div with onClick/onKeyDown, not a real input — clicking opens CatalogSearchOverlay directly
+- Auth check uses `!!auth?.user` (not `auth?.authenticated`) per plan anti-pattern guidance
+
+## Deviations from Plan
+
+None - plan executed exactly as written.
+
+## Issues Encountered
+
+None.
+
+## User Setup Required
+
+None - no external service configuration required.
+
+## Known Stubs
+
+None — all three discovery sections fetch real data from the API endpoints built in plans 26-01 and 26-02. Empty state is handled by hiding sections.
+
+## Next Phase Readiness
+- Discovery landing page complete — phase 26 fully delivered
+- All DISC-01 through DISC-05 requirements satisfied
+- PublicSetupCard enhancement available for any future usage needing item counts
+
+## Self-Check: PASSED
+
+---
+*Phase: 26-discovery-landing-page*
+*Completed: 2026-04-10*