feat: Add package type support and per-intake takenBy (#89)

## Package Type Feature
- Add 'blister' and 'bottle' package types for medications
- Bottle type uses totalPills for capacity and looseTablets for current stock
- Blister type continues to use packCount/blistersPerPack/pillsPerBlister
- Add doseUnit field for flexible dosing (mg, ml, IU, etc.)
- Full UI support in medication form and detail modal

## Per-Intake TakenBy
- Move takenBy from medication level to individual intakes
- Each intake schedule can now be assigned to a different person
- Update scheduler-utils to handle per-intake takenBy
- Update SharedSchedule to filter by per-intake takenBy
- Backward compatible with existing medication data

## UI Improvements
- Add PasswordInput component with show/hide toggle
- Centralize stockThresholds in AppContext for consistent status display
- Fix SharedSchedule sync issues with per-intake takenBy
- Improve mobile editing experience

## Technical
- Add migrations 0004 and 0005 for schema changes
- Update all relevant tests (1064 tests passing)
- Maintain backward compatibility with ALTER migrations

frontend/src/App.tsx

@@ -185,6 +185,9 @@ function AppContent() {
 	const [showProfile, setShowProfile] = useState(false);
 	const [showAbout, setShowAbout] = useState(false);
 
+	// Get centralized stockThresholds from context
+	const { stockThresholds } = ctx;
+
 	// Close modal on Escape key
 	useEffect(() => {
 		const handleEscape = (e: KeyboardEvent) => {
@@ -417,7 +420,7 @@ function AppContent() {
 			<MedDetailModal
 				selectedMed={selectedMed}
 				coverage={coverage}
-				settings={settings}
+				settings={stockThresholds}
 				showImageLightbox={showImageLightbox}
 				showRefillModal={showRefillModal}
 				showEditStockModal={showEditStockModal}
@@ -450,7 +453,7 @@ function AppContent() {
 				selectedUser={selectedUser}
 				meds={meds}
 				coverage={coverage}
-				settings={settings}
+				settings={stockThresholds}
 				onClose={closeUserFilter}
 				onOpenMedDetail={openMedDetail}
 			/>