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

backend/src/db/client.ts

@@ -92,6 +92,13 @@ export async function runAlterMigrations(client: Client): Promise<{ success: boo
 		// Added for more detailed reminder info display
 		`ALTER TABLE user_settings ADD COLUMN last_reminder_med_name text`,
 		`ALTER TABLE user_settings ADD COLUMN last_reminder_taken_by text`,
+		// Added for package type support (blister vs bottle)
+		`ALTER TABLE medications ADD COLUMN package_type text NOT NULL DEFAULT 'blister'`,
+		`ALTER TABLE medications ADD COLUMN total_pills integer`,
+		// Added for dose unit selection (mg, g, mcg, ml, IU, etc.)
+		`ALTER TABLE medications ADD COLUMN dose_unit text DEFAULT 'mg'`,
+		// Added for intake-level takenBy: unified intakes structure
+		`ALTER TABLE medications ADD COLUMN intakes_json text NOT NULL DEFAULT '[]'`,
 	];
 
 	for (const sql of alterMigrations) {