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/utils/urlValidator.ts

@@ -0,0 +1,25 @@
+const ALLOWED_PROTOCOLS = new Set(['http:', 'https:', 'ws:', 'wss:']);
+
+export interface UrlValidationResult {
+  valid: boolean;
+  error?: string;
+}
+
+export function validateServerUrl(url: string): UrlValidationResult {
+  if (typeof url !== 'string' || !url.trim()) {
+    return { valid: false, error: 'URL must be a non-empty string.' };
+  }
+
+  try {
+    const parsed = new URL(url);
+    if (!ALLOWED_PROTOCOLS.has(parsed.protocol)) {
+      return { valid: false, error: 'URL must use http, https, ws, or wss.' };
+    }
+    if (!parsed.host) {
+      return { valid: false, error: 'URL must include a host.' };
+    }
+    return { valid: true };
+  } catch {
+    return { valid: false, error: 'Invalid URL format.' };
+  }
+}