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/services/rssi.service.android.ts

@@ -0,0 +1,62 @@
+import type { RssiService, WifiNetwork } from './rssi.service';
+import WifiManager from '@react-native-wifi-reborn';
+
+type NativeWifiNetwork = {
+  SSID?: string;
+  BSSID?: string;
+  level?: number;
+  levelDbm?: number;
+};
+
+class AndroidRssiService implements RssiService {
+  private timer: ReturnType<typeof setInterval> | null = null;
+  private listeners = new Set<(networks: WifiNetwork[]) => void>();
+
+  startScanning(intervalMs: number): void {
+    this.stopScanning();
+    this.scanOnce();
+    this.timer = setInterval(() => {
+      this.scanOnce();
+    }, intervalMs);
+  }
+
+  stopScanning(): void {
+    if (this.timer) {
+      clearInterval(this.timer);
+      this.timer = null;
+    }
+  }
+
+  subscribe(listener: (networks: WifiNetwork[]) => void): () => void {
+    this.listeners.add(listener);
+    return () => {
+      this.listeners.delete(listener);
+    };
+  }
+
+  private async scanOnce(): Promise<void> {
+    try {
+      const results = (await WifiManager.loadWifiList()) as NativeWifiNetwork[];
+      const mapped = results.map((item) => ({
+        ssid: item.SSID || '',
+        bssid: item.BSSID,
+        level: typeof item.level === 'number' ? item.level : typeof item.levelDbm === 'number' ? item.levelDbm : -100,
+      }));
+      this.broadcast(mapped.filter((n) => n.ssid.length > 0));
+    } catch {
+      this.broadcast([]);
+    }
+  }
+
+  private broadcast(networks: WifiNetwork[]): void {
+    this.listeners.forEach((listener) => {
+      try {
+        listener(networks);
+      } catch {
+        // listener safety
+      }
+    });
+  }
+}
+
+export const rssiService = new AndroidRssiService();