Initial commit: Next Step health management app

A calm, reliable app to help manage appointments, medications, and notes
for chemo patients and their families.

Features:
- Today dashboard with next appointment and medications due
- Medication tracking with multiple schedule types (fixed times, interval, weekdays, PRN)
- One-tap dose logging with 5-minute undo window
- Questions for doctor tracking
- Family sharing with workspace model and invite links
- Offline-first with IndexedDB and sync
- Docker Compose deployment with Tailscale Funnel support

Tech stack:
- Next.js 14 (App Router) + TypeScript + Tailwind CSS
- PostgreSQL + Prisma
- Argon2 password hashing + session cookies
- Dexie.js for IndexedDB

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/app/(app)/provider.tsx

@@ -0,0 +1,86 @@
+'use client'
+
+import { createContext, useContext, useEffect, useState, useCallback } from 'react'
+import { startAutoSync, stopAutoSync, sync } from '@/lib/sync'
+
+interface User {
+  id: string
+  email: string
+  name: string
+}
+
+interface Workspace {
+  id: string
+  name: string
+  role: string
+  clinicPhone: string | null
+  emergencyPhone: string | null
+  largeTextMode: boolean
+}
+
+interface AppContextType {
+  user: User
+  workspaces: Workspace[]
+  currentWorkspace: Workspace
+  setCurrentWorkspaceId: (id: string) => void
+  refreshData: () => Promise<void>
+}
+
+const AppContext = createContext<AppContextType | null>(null)
+
+export function useApp() {
+  const context = useContext(AppContext)
+  if (!context) {
+    throw new Error('useApp must be used within AppProvider')
+  }
+  return context
+}
+
+interface AppProviderProps {
+  children: React.ReactNode
+  user: User
+  workspaces: Workspace[]
+  initialWorkspaceId: string
+}
+
+export function AppProvider({
+  children,
+  user,
+  workspaces,
+  initialWorkspaceId,
+}: AppProviderProps) {
+  const [currentWorkspaceId, setCurrentWorkspaceId] = useState(initialWorkspaceId)
+
+  const currentWorkspace = workspaces.find((w) => w.id === currentWorkspaceId) || workspaces[0]
+
+  // Start auto-sync when workspace changes
+  useEffect(() => {
+    if (currentWorkspaceId) {
+      startAutoSync(currentWorkspaceId)
+    }
+
+    return () => {
+      stopAutoSync()
+    }
+  }, [currentWorkspaceId])
+
+  const refreshData = useCallback(async () => {
+    if (currentWorkspaceId) {
+      await sync(currentWorkspaceId)
+    }
+  }, [currentWorkspaceId])
+
+  return (
+    <AppContext.Provider
+      value={{
+        user,
+        workspaces,
+        currentWorkspace,
+        setCurrentWorkspaceId,
+        refreshData,
+      }}
+    >
+      {children}
+    </AppContext.Provider>
+  )
+}