Production deployment setup + feature complete

- Dockerfile + deploy.sh for Hetzner server
- Email verification via Better Auth + Resend
- Invite code flow (6-digit OTP, generate/join)
- Settlement share percent fix (payer vs debtor)
- OCR scanner fixes (date display, retry, viewfinder)
- app.json icon/splash/adaptive-icon configured
- iOS deployment target 15.5 (ML Kit requirement)
- DB migration 0014: household_invitations table

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/native/contexts/app-theme-context.tsx

@@ -1,55 +1,28 @@
-import React, { createContext, useCallback, useContext, useMemo } from "react";
-import { Uniwind, useUniwind } from "uniwind";
+import { createContext, useContext, useState, useEffect } from "react";
+import { Appearance } from "react-native";
+import { Uniwind } from "uniwind";
 
-type ThemeName = "light" | "dark";
+type AppThemeContextType = { themeName: string };
 
-type AppThemeContextType = {
-  currentTheme: string;
-  isLight: boolean;
-  isDark: boolean;
-  setTheme: (theme: ThemeName) => void;
-  toggleTheme: () => void;
-};
-
-const AppThemeContext = createContext<AppThemeContextType | undefined>(undefined);
+const AppThemeContext = createContext<AppThemeContextType>({ themeName: "light" });
 
 export const AppThemeProvider = ({ children }: { children: React.ReactNode }) => {
-  const { theme } = useUniwind();
-
-  const isLight = useMemo(() => {
-    return theme === "light";
-  }, [theme]);
-
-  const isDark = useMemo(() => {
-    return theme === "dark";
-  }, [theme]);
-
-  const setTheme = useCallback((newTheme: ThemeName) => {
-    Uniwind.setTheme(newTheme);
-  }, []);
-
-  const toggleTheme = useCallback(() => {
-    Uniwind.setTheme(theme === "light" ? "dark" : "light");
-  }, [theme]);
-
-  const value = useMemo(
-    () => ({
-      currentTheme: theme,
-      isLight,
-      isDark,
-      setTheme,
-      toggleTheme,
-    }),
-    [theme, isLight, isDark, setTheme, toggleTheme],
+  const [themeName, setThemeName] = useState<string>(
+    () => Uniwind.currentTheme ?? "light",
   );
 
-  return <AppThemeContext.Provider value={value}>{children}</AppThemeContext.Provider>;
+  useEffect(() => {
+    const sub = Appearance.addChangeListener(({ colorScheme }) => {
+      setThemeName(colorScheme ?? "light");
+    });
+    return () => sub.remove();
+  }, []);
+
+  return (
+    <AppThemeContext.Provider value={{ themeName }}>
+      {children}
+    </AppThemeContext.Provider>
+  );
 };
 
-export function useAppTheme() {
-  const context = useContext(AppThemeContext);
-  if (!context) {
-    throw new Error("useAppTheme must be used within AppThemeProvider");
-  }
-  return context;
-}
+export const useAppTheme = () => useContext(AppThemeContext);