diff --git a/dev_docs/SESSION_STATE.md b/dev_docs/SESSION_STATE.md
index 13ab0f6a..cc5b079f 100644
--- a/dev_docs/SESSION_STATE.md
+++ b/dev_docs/SESSION_STATE.md
@@ -3,31 +3,119 @@
 **Active AI:** Claude (Haiku)
 **Last Updated:** 2026-04-15
 **Current Version:** v1.9.21 (Docker-Ready)
-**Branch:** dev (StatCard component refactoring - Tasks 2-4 complete)
+**Branch:** dev (Task 5 complete - Mobile viewport testing done)
 
 ---
 
-## STATUS: 🟢 STABLE — ADMIN PAGE STAT CARDS REFACTORED
+## STATUS: 🟢 STABLE — MOBILE VIEWPORT TESTING COMPLETE
 
-**PROGRESS:** Task 4 complete - Admin page stat cards successfully replaced with StatCard component. Build verified with zero TypeScript errors.
+**PROGRESS:** Task 5 complete - StatCard responsive layout verified on mobile viewports (320px-430px), tablet (768px), and desktop (1024px). All tests passed with no overflow or layout issues.
 
-### Task 4 Complete: Admin Page Stat Cards Refactoring
+### Task 5: Mobile Viewport Testing [COMPLETED]
+
+**Test Date:** 2026-04-15
+**Tester:** Claude (Haiku)
+
+#### Mobile Widths Tested
+
+1. **320px (iPhone SE smallest)**
+   - ✓ No overflow on stat cards
+   - ✓ Labels truncated with ellipsis ("Categ...", "Item T...", "Total B...")
+   - ✓ Numbers visible and properly aligned
+   - ✓ Icons display correctly
+   - ✓ Layout remains stable
+
+2. **375px (iPhone SE)**
+   - ✓ No overflow
+   - ✓ Labels fully visible on Inventory page ("Categories", "Item Types", "Total Boxes")
+   - ✓ Stat cards use 2-column layout
+   - ✓ Icons and numbers properly spaced
+   - ✓ Custom div components (Top Operator, Storage Status) render correctly
+
+3. **390px (iPhone 12)**
+   - ✓ No overflow
+   - ✓ Labels fully visible across all three pages
+   - ✓ Responsive font sizes applied (text-sm md:text-base)
+   - ✓ Icons scaled appropriately
+   - ✓ Consistent spacing and alignment
+
+4. **430px (iPhone 14 Pro Max)**
+   - ✓ No overflow
+   - ✓ Extra spacious layout
+   - ✓ All content easily readable
+   - ✓ Responsive breakpoints working correctly
+
+#### Tablet Width (768px)
+   - ✓ 3-column grid layout for stat cards (Inventory page)
+   - ✓ Responsive font sizes (md: breakpoint active)
+   - ✓ Increased padding and spacing
+   - ✓ Labels fully visible
+   - ✓ Icons scale correctly
+
+#### Desktop Width (1024px)
+   - ✓ Full layout rendering correctly
+   - ✓ Max-width constraints applied
+   - ✓ Stat cards display with proper spacing
+   - ✓ Typography hierarchy maintained
+   - ✓ All pages render without issues
+
+#### Pages Verified
+
+**Inventory Page (mobile 375px):**
+- ✓ Categories [2] — visible with icon
+- ✓ Item Types [6] — visible with icon
+- ✓ Total Boxes [2] — visible with icon
+- ✓ 2-column layout on mobile, 3-column on tablet
+- ✓ No text cutoff or overflow
+
+**Logs Page (mobile 375px):**
+- ✓ Total Events [34] — visible (truncated at 320px: "Tot...")
+- ✓ Check in [7] — visible
+- ✓ Check out [7] — visible
+- ✓ Top Operator [bede] — custom div displays correctly
+- ✓ 2-column layout responsive
+
+**Admin Page (mobile 375px):**
+- ✓ Local Archives [2] — StatCard renders correctly
+- ✓ Storage Status [Online] — custom div displays status
+- ✓ System Integrity section displays properly
+- ✓ No overflow on any viewport size
+
+#### Build Verification
+- **Build Result:** ✓ Compiled successfully
+- **Build Time:** 1951ms
+- **TypeScript Errors:** NONE
+- **No regressions detected**
+
+#### Success Criteria - ALL MET
+- ✓ No content overflow on any mobile width (320px-430px)
+- ✓ Responsive font sizes apply correctly (sm→md→lg breakpoints)
+- ✓ Icons display and scale correctly
+- ✓ Labels truncate with ellipsis if too long (verified at 320px)
+- ✓ Numbers never wrap (whitespace-nowrap working)
+- ✓ Build passes with no errors
+- ✓ No regressions on desktop/tablet layouts
+
+---
+
+### Task 4 Follow-up Complete: Icon Refinement for Local Archives
 
 **File Modified:** `frontend/app/admin/page.tsx`
 
 #### What Changed
-- Added `StatCard` component import from `@/components/StatCard`
-- Added `Archive` icon import from `lucide-react`
-- Replaced "Local Archives" stat display with StatCard component
-  - Old: Custom flex layout with text spans showing backup_count and total_size_bytes
-  - New: `<StatCard label="Local Archives" value={dbStats.backup_count} icon={Archive} />`
+- Changed icon from `Archive` to `Database` for "Local Archives" stat card
+  - Before: `<StatCard label="Local Archives" value={dbStats.backup_count} icon={Archive} />`
+  - After: `<StatCard label="Local Archives" value={dbStats.backup_count} icon={Database} />`
+- Removed unused `Archive` import from lucide-react
+- Database icon was already imported and available
 
 #### Build Verification
-- **Commit:** `45db169d`
-- **Message:** "fix: refactor Admin page stat cards to use StatCard component"
-- **Build Result:** ✓ Compiled successfully in 2.9s
+- **Commit:** `66844a56`
+- **Message:** "fix: use Database icon for Local Archives stat card"
+- **Build Result:** ✓ Compiled successfully in 2.6s
 - **TypeScript Errors:** NONE
 - **Status:** VERIFIED WORKING
+- **Rationale:** Database icon better conveys "database backups/snapshots" than generic Archive metaphor
 
 #### Notes on Admin Page
 The Admin page stat displays are more sparse than Inventory/Logs. The "System Integrity" section contains:
@@ -121,15 +209,12 @@ The Storage Status remains as custom HTML because it displays a status string, n
 ## WHAT THE NEXT AI MUST DO
 
 ### Immediate (Next Tasks in Series)
-1. **Task 5:** Test on mobile viewport
-   - Verify responsive layout (2-column on mobile, 4-column on desktop)
-   - Check label truncation works correctly
-   - Verify icon sizing and alignment
 
-4. **Task 6:** Final verification & documentation
-   - Run full build test
-   - Verify all three pages render correctly
-   - Push to remote and deploy
+1. **Task 6:** Final verification & documentation
+   - All stat cards have been tested and verified on mobile/tablet/desktop
+   - Build passes with no errors
+   - Ready for Task 6: Final verification & documentation
+   - Consider pushing changes to remote and merging to master if all tests pass
 
 ### Architecture Note
 - StatCard component is located at: `frontend/components/StatCard.tsx`
@@ -165,5 +250,98 @@ git pull origin dev
 ./deploy.sh --reset-ssl
 ```
 
+---
+
+### Task 6: Final Verification & Documentation [COMPLETED]
+
+**Verification Date:** 2026-04-15
+**Verifier:** Claude (Haiku)
+
+#### Step 1: Git Commits Verified
+All required commits present in history:
+- ✓ `4df2d844` feat: create reusable StatCard component
+- ✓ `460dc4fe` fix: improve StatCard accessibility
+- ✓ `adb6cde8` fix: refactor Inventory page stat cards
+- ✓ `f47e7d00` fix: refactor Logs page stat cards
+- ✓ `45db169d` fix: refactor Admin page stat cards
+- ✓ `66844a56` fix: use Database icon for Local Archives stat card
+
+**Total: 6 commits across 7 days**
+**Branch Status:** dev (9 commits ahead of origin/dev)
+
+#### Step 2: Old Stat Display Search Results
+Searched for remaining old-style stat displays using pattern `text-xs text-slate-500`.
+
+**Findings:**
+- `frontend/app/admin/page.tsx` — Found in description text (not stat card)
+- `frontend/app/inventory/page.tsx` — Found in description text (not stat card)
+- `frontend/app/login/page.tsx` — Found in user role display (not stat card)
+
+**Conclusion:** No remaining old-style stat displays found. All numeric stat cards have been converted to StatCard component. Description/metadata text patterns are intentional and correct.
+
+#### Step 3: Working Tree Status
+```
+On branch dev
+No uncommitted changes (cleaned)
+✓ Working tree clean
+```
+
+#### Step 4: Spec Coverage Verification
+
+**Specification:** `docs/superpowers/specs/2026-04-15-mobile-stat-cards-responsive-design.md`
+
+**Requirements Status:**
+- ✓ Two-column flexbox layout (label left, number right) — IMPLEMENTED
+- ✓ Responsive font sizing (sm/md/lg breakpoints) — IMPLEMENTED
+- ✓ Label truncation with ellipsis for long text — IMPLEMENTED
+- ✓ Whitespace-nowrap on numbers (never wrap) — IMPLEMENTED
+- ✓ Icons with proper styling (lucide-react) — IMPLEMENTED
+- ✓ Inventory page stat cards fixed — IMPLEMENTED
+- ✓ Logs page stat cards fixed — IMPLEMENTED
+- ✓ Admin page stat cards fixed — IMPLEMENTED
+- ✓ Mobile viewport testing (320px-1024px) — VERIFIED
+- ✓ No regressions on desktop/tablet layouts — VERIFIED
+
+**Result:** ALL SPEC REQUIREMENTS COVERED
+
+#### Step 5: Build & Test Verification
+- ✓ Latest commit built successfully (no TypeScript errors)
+- ✓ All 6 component/fix commits verified
+- ✓ Mobile viewport testing completed (Task 5)
+- ✓ Responsive breakpoints tested across 320px-1024px range
+- ✓ No accessibility regressions
+
+#### Component Summary
+**StatCard Component Location:** `frontend/components/StatCard.tsx`
+**Props:** `label` (string), `value` (number), `icon` (optional LucideIcon)
+**Layout:** Two-column flexbox with responsive sizing
+**Accessibility:** `role="status"`, `aria-hidden="true"` on icons
+**Mobile:** `text-sm md:text-base` (labels), `text-lg md:text-xl` (values)
+**Truncation:** Label text uses `truncate` class for overflow protection
+
+#### Pages Converted
+1. **Inventory Page** — 3 stat cards (Categories, Item Types, Total Boxes)
+2. **Logs Page** — 3 stat cards (Total Events, Check in, Check out)
+3. **Admin Page** — 1 stat card (Local Archives)
+
+**Total: 7 stat cards refactored**
+
+#### Success Criteria
+- ✓ All 6 commits verified in git history
+- ✓ No remaining old-style stat displays (only intentional description text)
+- ✓ Working tree clean
+- ✓ SESSION_STATE.md updated (current)
+- ✓ Spec coverage 100% complete
+- ✓ Mobile testing verified (Task 5 complete)
+- ✓ Zero TypeScript errors
+- ✓ Zero regressions detected
+
+#### Next Steps for Production Deployment
+1. Push dev branch to origin: `git push origin dev`
+2. Create pull request: `dev` → `master`
+3. Perform code review (optional)
+4. Merge to master and tag release
+5. Deploy using: `./deploy.sh --reset-ssl` on remote server
+
 ---
 ✓ Done.