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;
         }
     });

src/routes/events/[event_id]/(launcher)/launcher_background_sync.svelte

@@ -36,8 +36,6 @@
     let show_monitor = $state(false);
 
     onMount(() => {
-        if (!$ae_loc.is_native) return;
-
         const dev = $ae_loc.native_device || {};
         
         // Load timings from device config
@@ -46,6 +44,7 @@
         loop_info.location = dev.check_event_location_loop_period || 30000;
         loop_info.session = dev.check_event_session_loop_period || 10000;
 
+        // Timers run in both browser and native for dev/testing
         timer__event = setInterval(() => run_sync_cycle(), loop_info.event);
         timer__device = setInterval(() => run_device_heartbeat(), loop_info.device);
         timer__location = setInterval(() => refresh_location_config(), loop_info.location);
@@ -69,7 +68,7 @@
         const cache_root = $ae_loc.local_file_cache_path;
         const prefix_len = $ae_loc.native_device?.hash_prefix_length || 2;
 
-        if (!location_id || !cache_root || is_syncing) return;
+        if (!location_id || !cache_root || is_syncing || !$ae_loc.is_native) return;
 
         is_syncing = true;
         try {
@@ -144,22 +143,31 @@
         if (log_lvl > 1) console.log(`Sync: Running heartbeat for device: ${device_id}`);
 
         try {
-            const info = await native.get_device_info();
-            if (!info) return;
+            let info = null;
+            if ($ae_loc.is_native) {
+                info = await native.get_device_info();
+            }
 
-            const update_payload = {
-                heartbeat: ae_util.iso_datetime_formatter(new Date(), 'datetime_iso'),
-                info_hostname: info.hostname,
-                info_ip_list: info.ip_addresses.join(', '),
-                meta_json: {
+            const update_payload: any = {
+                // Use standard toISOString() for unambiguous UTC on server
+                heartbeat: new Date().toISOString()
+            };
+
+            if (info) {
+                update_payload.info_hostname = info.hostname;
+                update_payload.info_ip_list = info.ip_addresses.join(', ');
+                update_payload.meta_json = {
                     platform: info.platform,
                     release: info.release,
                     arch: info.arch,
                     cpus: info.cpus,
                     total_mem: Math.round(info.total_mem / (1024 * 1024)) + 'MB',
                     free_mem: Math.round(info.free_mem / (1024 * 1024)) + 'MB'
-                }
-            };
+                };
+            } else {
+                update_payload.info_hostname = 'Web Browser';
+                update_payload.notes = 'Heartbeat from non-native web session.';
+            }
 
             await events_func.update_ae_obj__event_device({
                 api_cfg: $ae_api,