feat: add Expo React Native client scaffold

- Expo SDK 54 / React Native 0.81 with expo-router
- Tailscale devcontainer feature for direct device connectivity
- Dev proxy for React Native DevTools access over Tailscale
- EAS build configuration for development/preview/production
- Ona automation for Expo dev server

Co-authored-by: Ona <no-reply@ona.com>

apps/aris-client/src/app/(tabs)/_layout.tsx

@@ -0,0 +1,36 @@
+import { Tabs } from "expo-router"
+import React from "react"
+
+import { HapticTab } from "@/components/haptic-tab"
+import { IconSymbol } from "@/components/ui/icon-symbol"
+import { Colors } from "@/constants/theme"
+import { useColorScheme } from "@/hooks/use-color-scheme"
+
+export default function TabLayout() {
+	const colorScheme = useColorScheme()
+
+	return (
+		<Tabs
+			screenOptions={{
+				tabBarActiveTintColor: Colors[colorScheme ?? "light"].tint,
+				headerShown: false,
+				tabBarButton: HapticTab,
+			}}
+		>
+			<Tabs.Screen
+				name="index"
+				options={{
+					title: "Home",
+					tabBarIcon: ({ color }) => <IconSymbol size={28} name="house.fill" color={color} />,
+				}}
+			/>
+			<Tabs.Screen
+				name="explore"
+				options={{
+					title: "Explore",
+					tabBarIcon: ({ color }) => <IconSymbol size={28} name="paperplane.fill" color={color} />,
+				}}
+			/>
+		</Tabs>
+	)
+}