feat(FN-1116): add Capacitor plugin managers for dashboard

- Add shared plugin types and manager modules for splash screen, status bar, and network handling
- Export plugin initialization from the dashboard entrypoint and configure Capacitor splash/status-bar defaults
- Add unit tests covering plugin initialization and each manager's behavior across supported scenarios
- Document the plugin manager architecture and add required Capacitor plugin dependencies

packages/dashboard/capacitor.config.ts

@@ -16,13 +16,17 @@ const config: CapacitorConfig = {
   },
   plugins: {
     SplashScreen: {
-      launchAutoHide: true,
+      launchAutoHide: false,
       backgroundColor: "#0a0a0a",
       showSpinner: true,
       spinnerColor: "#6366f1",
       androidSplashAssetName: "splash",
       androidScaleType: "CENTER_CROP",
     },
+    StatusBar: {
+      style: "DARK",
+      backgroundColor: "#0a0a0a",
+    },
   },
 };