feat: add expo mobile application source code

mobile/hooks/use-color-scheme.ts

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+export { useColorScheme } from 'react-native';

mobile/hooks/use-color-scheme.web.ts

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+import { useEffect, useState } from 'react';
+import { useColorScheme as useRNColorScheme } from 'react-native';
+
+/**
+ * To support static rendering, this value needs to be re-calculated on the client side for web
+ */
+export function useColorScheme() {
+  const [hasHydrated, setHasHydrated] = useState(false);
+
+  useEffect(() => {
+    setHasHydrated(true);
+  }, []);
+
+  const colorScheme = useRNColorScheme();
+
+  if (hasHydrated) {
+    return colorScheme;
+  }
+
+  return 'light';
+}

mobile/hooks/use-theme-color.ts

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+/**
+ * Learn more about light and dark modes:
+ * https://docs.expo.dev/guides/color-schemes/
+ */
+
+import { Colors } from '@/constants/theme';
+import { useColorScheme } from '@/hooks/use-color-scheme';
+
+export function useThemeColor(
+  props: { light?: string; dark?: string },
+  colorName: keyof typeof Colors.light & keyof typeof Colors.dark
+) {
+  const theme = useColorScheme() ?? 'light';
+  const colorFromProps = props[theme];
+
+  if (colorFromProps) {
+    return colorFromProps;
+  } else {
+    return Colors[theme][colorName];
+  }
+}

mobile/hooks/useForm.ts

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+import { useState } from 'react';
+
+export function useForm<T>(initialValues: T) {
+  const [values, setValues] = useState<T>(initialValues);
+  const [errors, setErrors] = useState<Partial<Record<keyof T, string>>>({});
+
+  const handleChange = (name: keyof T, value: string) => {
+    setValues({
+      ...values,
+      [name]: value,
+    });
+    // Clear error when user types
+    if (errors[name]) {
+      setErrors({
+        ...errors,
+        [name]: undefined,
+      });
+    }
+  };
+
+  const setFieldError = (name: keyof T, error: string) => {
+    setErrors({
+      ...errors,
+      [name]: error,
+    });
+  };
+
+  return {
+    values,
+    errors,
+    handleChange,
+    setFieldError,
+    setValues,
+  };
+}