chore: initialize Expo SDK 55 project with TypeScript

React Native + Expo Router setup with strict TypeScript,
path aliases, and dark-first configuration.

metro.config.js

@@ -0,0 +1,11 @@
+const { getDefaultConfig } = require("expo/metro-config");
+const path = require("path");
+
+const config = getDefaultConfig(__dirname);
+
+// Path alias: @/ → src/
+config.resolver.alias = {
+  "@": path.resolve(__dirname, "src"),
+};
+
+module.exports = config;