feat: login form as a client component, theme toggle

components/PhoneInput/utils/getFlagEmoji.ts

@@ -0,0 +1,8 @@
+export default function getFlagEmoji(countryCode: string) {
+    const FLAG_CODE_OFFSET = 127397;
+    const codePoints = countryCode
+        .toUpperCase()
+        .split("")
+        .map(char => FLAG_CODE_OFFSET + char.charCodeAt(0));
+    return String.fromCodePoint(...codePoints);
+}