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/constants/theme.ts

@@ -0,0 +1,53 @@
+/**
+ * Below are the colors that are used in the app. The colors are defined in the light and dark mode.
+ * There are many other ways to style your app. For example, [Nativewind](https://www.nativewind.dev/), [Tamagui](https://tamagui.dev/), [unistyles](https://reactnativeunistyles.vercel.app), etc.
+ */
+
+import { Platform } from "react-native"
+
+const tintColorLight = "#0a7ea4"
+const tintColorDark = "#fff"
+
+export const Colors = {
+	light: {
+		text: "#11181C",
+		background: "#fff",
+		tint: tintColorLight,
+		icon: "#687076",
+		tabIconDefault: "#687076",
+		tabIconSelected: tintColorLight,
+	},
+	dark: {
+		text: "#ECEDEE",
+		background: "#151718",
+		tint: tintColorDark,
+		icon: "#9BA1A6",
+		tabIconDefault: "#9BA1A6",
+		tabIconSelected: tintColorDark,
+	},
+}
+
+export const Fonts = Platform.select({
+	ios: {
+		/** iOS `UIFontDescriptorSystemDesignDefault` */
+		sans: "system-ui",
+		/** iOS `UIFontDescriptorSystemDesignSerif` */
+		serif: "ui-serif",
+		/** iOS `UIFontDescriptorSystemDesignRounded` */
+		rounded: "ui-rounded",
+		/** iOS `UIFontDescriptorSystemDesignMonospaced` */
+		mono: "ui-monospace",
+	},
+	default: {
+		sans: "normal",
+		serif: "serif",
+		rounded: "normal",
+		mono: "monospace",
+	},
+	web: {
+		sans: "system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif",
+		serif: "Georgia, 'Times New Roman', serif",
+		rounded: "'SF Pro Rounded', 'Hiragino Maru Gothic ProN', Meiryo, 'MS PGothic', sans-serif",
+		mono: "SFMono-Regular, Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace",
+	},
+})