feat: Implement RSSI service for iOS and Web platforms

- Added IosRssiService to handle synthetic RSSI data for iOS.
- Created WebRssiService to simulate RSSI scanning on the web.
- Defined shared types for WifiNetwork and RssiService in rssi.service.ts.
- Introduced simulation service to generate synthetic sensing data.
- Implemented WebSocket service for real-time data handling with reconnection logic.
- Established Zustand stores for managing application state related to MAT and pose data.
- Developed theme context and utility functions for consistent styling and formatting.
- Added type definitions for various application entities including API responses and sensing data.
- Created utility functions for color mapping and URL validation.
- Configured TypeScript settings for the mobile application.

ui/mobile/src/stores/settingsStore.ts

@@ -0,0 +1,47 @@
+import AsyncStorage from '@react-native-async-storage/async-storage';
+import { create } from 'zustand';
+import { createJSONStorage, persist } from 'zustand/middleware';
+
+export type Theme = 'light' | 'dark' | 'system';
+
+export interface SettingsState {
+  serverUrl: string;
+  rssiScanEnabled: boolean;
+  theme: Theme;
+  alertSoundEnabled: boolean;
+  setServerUrl: (url: string) => void;
+  setRssiScanEnabled: (value: boolean) => void;
+  setTheme: (theme: Theme) => void;
+  setAlertSoundEnabled: (value: boolean) => void;
+}
+
+export const useSettingsStore = create<SettingsState>()(
+  persist(
+    (set) => ({
+      serverUrl: 'http://localhost:3000',
+      rssiScanEnabled: false,
+      theme: 'system',
+      alertSoundEnabled: true,
+
+      setServerUrl: (url) => {
+        set({ serverUrl: url });
+      },
+
+      setRssiScanEnabled: (value) => {
+        set({ rssiScanEnabled: value });
+      },
+
+      setTheme: (theme) => {
+        set({ theme });
+      },
+
+      setAlertSoundEnabled: (value) => {
+        set({ alertSoundEnabled: value });
+      },
+    }),
+    {
+      name: 'wifi-densepose-settings',
+      storage: createJSONStorage(() => AsyncStorage),
+    },
+  ),
+);