fix(launcher): resolve heartbeat timezone shift and enable browser testing

- Removed manual 'Z' suffix addition in device processing to fix incorrect offsets.
- Switched heartbeat payload to standard UTC ISO strings.
- Enabled background timers in non-native environments for easier verification.
- Hardened telemetry gathering to skip Electron-only APIs when running in a browser.

src/lib/ae_events/ae_events__event_device.ts

@@ -480,9 +480,8 @@ export async function process_ae_obj__event_device_props({
         obj_type: 'event_device',
         log_lvl,
         specific_processor: (obj) => {
-            if (obj.heartbeat) {
-                obj.heartbeat = obj.heartbeat + 'Z';
-            }
+            // Note: V3 API returns proper ISO strings. 
+            // We no longer manually append 'Z' to avoid timezone corruption.
             return obj;
         }
     });