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/components/haptic-tab.tsx

@@ -0,0 +1,18 @@
+import { BottomTabBarButtonProps } from "@react-navigation/bottom-tabs"
+import { PlatformPressable } from "@react-navigation/elements"
+import * as Haptics from "expo-haptics"
+
+export function HapticTab(props: BottomTabBarButtonProps) {
+	return (
+		<PlatformPressable
+			{...props}
+			onPressIn={(ev) => {
+				if (process.env.EXPO_OS === "ios") {
+					// Add a soft haptic feedback when pressing down on the tabs.
+					Haptics.impactAsync(Haptics.ImpactFeedbackStyle.Light)
+				}
+				props.onPressIn?.(ev)
+			}}
+		/>
+	)
+}