feat(pmr): add interface materialization animations

- Login card fades out with scale animation (200ms)
- Patient banner slides down from top (200ms)
- Sidebar slides in from left (250ms, 50ms delay)
- Main content fades in (300ms, 150ms delay)
- Mobile nav slides up (200ms)
- All animations respect prefers-reduced-motion
- Mark Task 15 complete in IMPLEMENTATION_PLAN.md

Ralph/progress.txt

@@ -457,3 +457,29 @@ This is a complete redesign of the CV presentation, moving from the ECG animatio
   - isTablet/isMobile props passed from PMRInterface down to components
   - useBreakpoint hook avoids resize event listener thrashing with proper cleanup
   - Mobile overflow menu for banner actions reduces clutter on small screens
+
+### Iteration 15 — Task 15: Final integration, testing, and polish
+- **Completed**: Task 15 - Final integration with interface materialization animations
+- **Files modified**:
+  - `src/components/LoginScreen.tsx` - Added fade-out animation (scale 103%, fade 200ms) before transitioning to PMR
+  - `src/components/PMRInterface.tsx` - Added entrance animations for all UI elements with proper timing
+- **Changes made**:
+  - Login card now animates out with scale + fade before PMR interface appears
+  - Patient banner slides down from top (200ms, ease-out)
+  - Sidebar slides in from left (250ms, ease-out, 50ms delay)
+  - Main content fades in (300ms, 150ms delay)
+  - Mobile bottom nav slides up (200ms, ease-out)
+  - All animations respect `prefers-reduced-motion`: instant appearance with zero duration
+- **Design decisions**:
+  - Used framer motion for all entrance animations
+  - Animation timings match design spec exactly
+  - Reduced motion users see instant transitions (no animations)
+  - Variants defined with useMemo to prevent recreation on every render
+- **Known limitations**:
+  - Search only filters navigation items, not content across all sections (fuse.js not implemented)
+  - This was a deliberate scope decision from Iteration 5 - can enhance later
+- **Quality checks**: `npm run typecheck` ✓, `npm run lint` ✓ (1 pre-existing warning), `npm run build` ✓
+- **Learnings**:
+  - framer motion Variants type works well with useMemo for conditional reduced motion support
+  - Empty object `{}` in hidden state for reduced motion prevents any animation
+  - Login animation timing: ~1.2s (username 350ms + password 160ms + pauses 300ms + exit 200ms)