fix(launcher): load location files into Dexie on location select/refresh

refresh_location_config() was missing inc_file_li:true, so location-level
files were never fetched from the API and lq__location_event_file_obj_li
always returned empty from Dexie. Files only appeared when Pres Mgmt had
previously loaded them on the same device.

Also added a reactive $effect so files load immediately when the operator
switches rooms, rather than waiting up to 60s for the next timer tick.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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

@@ -154,6 +154,17 @@ onDestroy(() => {
     if (timer__file_sync) clearInterval(timer__file_sync);
 });
 
+// WHY: refresh_location_config() runs on a 60s timer. Without this effect,
+// switching locations leaves the new location's file list empty until the
+// next timer tick. Watching event_location_id here fires an immediate fetch
+// whenever the operator selects a different room.
+$effect(() => {
+    const location_id = $events_slct.event_location_id;
+    if (location_id) {
+        refresh_location_config();
+    }
+});
+
 /**
  * API Refresh: Event
  */
@@ -440,9 +451,13 @@ async function refresh_location_config() {
     if (!location_id) return;
 
     try {
+        // WHY: inc_file_li must be true so location-level files reach Dexie.
+        // Without it, lq__location_event_file_obj_li in the layout finds nothing and
+        // the location file list in the Launcher menu never renders.
         await events_func.load_ae_obj_id__event_location({
             api_cfg: $ae_api,
             event_location_id: location_id,
+            inc_file_li: true,
             try_cache: true,
             log_lvl: 0
         });