diff --git a/.planning/STATE.md b/.planning/STATE.md
index b821d75..c20a354 100644
--- a/.planning/STATE.md
+++ b/.planning/STATE.md
@@ -5,7 +5,7 @@ milestone_name: milestone
 status: executing
 stopped_at: Phase 4 UI-SPEC approved
 last_updated: "2026-06-22T12:42:52.447Z"
-last_activity: 2026-06-23 -- Plan 04-02 completed
+last_activity: 2026-06-23 -- Plan 04-03 completed
 progress:
   total_phases: 6
   completed_phases: 2
@@ -26,9 +26,9 @@ See: .planning/PROJECT.md (updated 2026-06-18)
 ## Current Position
 
 Phase: 04 (marketplace-portal-navigation) — EXECUTING
-Plan: 3 of 4
-Status: Plan 04-02 complete, ready for 04-03
-Last activity: 2026-06-23 -- Plan 04-02 completed (filters, tenant context, detail page)
+Plan: 4 of 4
+Status: Plan 04-03 complete, ready for 04-04
+Last activity: 2026-06-23 -- Plan 04-03 completed (sidebar enhancement)
 
 Progress: [██▓░░░░░░░] 25%
 
@@ -93,6 +93,6 @@ Items acknowledged and carried forward from previous milestone close:
 
 ## Session Continuity
 
-Last session: 2026-06-23T07:07:00Z
-Stopped at: Plan 04-02 complete, 04-03 ready
-Resume file: .planning/phases/04-marketplace-portal-navigation/04-03-PLAN.md
+Last session: 2026-06-23T08:22:00Z
+Stopped at: Plan 04-03 complete, 04-04 ready
+Resume file: .planning/phases/04-marketplace-portal-navigation/04-04-PLAN.md
diff --git a/.planning/phases/04-marketplace-portal-navigation/04-03-SUMMARY.md b/.planning/phases/04-marketplace-portal-navigation/04-03-SUMMARY.md
new file mode 100644
index 0000000..ac33ba7
--- /dev/null
+++ b/.planning/phases/04-marketplace-portal-navigation/04-03-SUMMARY.md
@@ -0,0 +1,73 @@
+---
+phase: 04-marketplace-portal-navigation
+plan: 03
+subsystem: ui
+tags: [react, next-link, usePathname, zustand, sidebar, search]
+
+requires:
+  - phase: 04-marketplace-portal-navigation/01
+    provides: marketplace-store with sidebarRefreshKey, sidebar i18n keys
+provides:
+  - All sidebar links migrated from raw <a> to Next.js Link (client-side nav)
+  - usePathname-based active highlighting for all sidebar links
+  - SidebarSearch component filtering modules and categories
+  - sidebarRefreshKey subscription for live sidebar updates after activation
+  - Per-module links under category groups
+affects: [04-04 navigation]
+
+tech-stack:
+  added: []
+  patterns: [usePathname active highlighting, Zustand cross-component refresh signal]
+
+key-files:
+  created:
+    - apps/web/src/components/layout/sidebar-search.tsx
+    - apps/web/src/components/layout/sidebar.test.tsx
+  modified:
+    - apps/web/src/components/layout/sidebar.tsx
+
+key-decisions:
+  - "All <a href> replaced with <Link> to prevent full page reloads"
+  - "sidebarRefreshKey in useEffect deps — sidebar re-fetches only on explicit signal, not on navigation"
+  - "Search hidden in collapsed mode per UI-SPEC"
+
+patterns-established:
+  - "isActive(href) helper: exact match for /, startsWith for all others"
+  - "useMemo category filtering with search query"
+
+requirements-completed: [MRKT-03, PRTAL-02, PRTAL-03, PRTAL-05]
+
+duration: 8min
+completed: 2026-06-23
+---
+
+# Plan 04-03: Sidebar Enhancement Summary
+
+**Sidebar migrated to Next.js Link with usePathname active highlighting, search filtering, and marketplace-store refresh subscription — 26 tests green**
+
+## Performance
+
+- **Duration:** ~8 min
+- **Tasks:** 2 (combined)
+- **Files modified:** 3
+
+## Accomplishments
+- All sidebar links migrated from raw `<a>` to Next.js `<Link>` (zero full reloads)
+- Dynamic active highlighting via usePathname for all links including per-module
+- SidebarSearch filters modules/categories, shows noResults when empty
+- sidebarRefreshKey subscription triggers re-fetch after marketplace activation
+- Search hidden in collapsed mode
+
+## Task Commits
+
+1. **Task 1+2: Sidebar migration + search + refresh** - `e967ea9` (feat)
+
+## Deviations from Plan
+None.
+
+## Next Phase Readiness
+- Plan 04-04 (navigation polish) can start — all sidebar and marketplace features operational
+
+---
+*Phase: 04-marketplace-portal-navigation*
+*Completed: 2026-06-23*