feat: theme dropdown with system preference and comprehensive bottle-type fixes (#138)

- Replace dark/light toggle with Light/Dark/System dropdown menu
- System theme follows OS prefers-color-scheme setting
- Apply theme dropdown to shared schedule page
- Fix 7 packageType (bottle) bugs across stock calc, share, refills, export/import
- Fix planner bottle-type stock calculation and display
- Fix dailyRate double-counting with per-intake takenBy
- Fix About modal update check stale caching
- Fix intake reminder past-intake seeding and push title
- Fix phantom DB path in drizzle.config.ts
- Fix mobile dose field visibility
- Make medication name clickable in dashboard reminder bar
- Improve planner checkbox UX with inline tooltip
- Add 20+ new tests covering all fixes

frontend/src/types/index.ts

@@ -67,6 +67,7 @@ export type PlannerRow = {
 	fullBlisters: number;
 	loosePills: number;
 	enough: boolean;
+	packageType?: PackageType;
 };
 
 export type RefillEntry = {
@@ -170,6 +171,7 @@ export type SharedMedication = {
 	doseUnit?: DoseUnit | null;
 	imageUrl?: string | null;
 	totalPills: number;
+	packageType?: PackageType;
 	packCount: number;
 	blistersPerPack: number;
 	looseTablets: number;