refactor(native): localize OS hydration to Launcher module

- Removed detailed OS path hydration from root +layout.ts to keep it lean.
- Moved home/tmp directory hydration to LauncherBackgroundSync onMount.
- Fixed regex pattern bug in electron_relay.ts (/\[home\]/g).
- Ensures absolute paths are correctly generated within the Launcher module.

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

@@ -5,7 +5,7 @@
      */
     import { onMount, onDestroy } from 'svelte';
     import { ae_loc, ae_api } from '$lib/stores/ae_stores';
-    import { events_slct } from '$lib/stores/ae_events_stores';
+    import { events_slct, events_sess } from '$lib/stores/ae_events_stores';
     import { events_func } from '$lib/ae_events_functions';
     import { ae_util } from '$lib/ae_utils/ae_utils';
     import { db_events } from '$lib/ae_events/db_events';
@@ -35,7 +35,21 @@
     let is_syncing = false;
     let show_monitor = $state(false);
 
-    onMount(() => {
+    onMount(async () => {
+        // 1. Initial hydration of native metadata (Phase 5)
+        if ($ae_loc.is_native) {
+            try {
+                const info = await native.get_device_info();
+                if (info) {
+                    $ae_loc.home_directory = info.home_directory;
+                    $ae_loc.tmp_directory = info.tmp_directory;
+                    if (log_lvl) console.log('Sync: Native OS metadata hydrated.', { home: info.home_directory });
+                }
+            } catch (err) {
+                console.error('Sync: Metadata hydration FAILED:', err);
+            }
+        }
+
         const dev = $ae_loc.native_device || {};
         
         // Load timings from device config
@@ -107,6 +121,7 @@
 
                 missing_count++;
                 currently_syncing = file_obj.filename;
+                $events_sess.launcher.sync_stats.currently_syncing = currently_syncing;
 
                 const url = `${$ae_api.base_url}/hosted_file/${file_obj.hosted_file_id}/download?return_file=true&filename=${encodeURIComponent(file_obj.filename)}`;
                 const result = await native.download_to_cache({
@@ -119,10 +134,19 @@
             }
             sync_stats.cached = cached_count;
             sync_stats.missing = missing_count;
+
+            // Sync to shared store
+            $events_sess.launcher.sync_stats = {
+                total: sync_stats.total,
+                cached: sync_stats.cached,
+                missing: sync_stats.missing,
+                currently_syncing: null
+            };
         } catch (err) {
             console.error('Sync Engine Error:', err);
         } finally {
             currently_syncing = null;
+            $events_sess.launcher.sync_stats.currently_syncing = null;
             is_syncing = false;
         }
     }
@@ -137,6 +161,7 @@
         
         if (!device_id) {
             if (log_lvl) console.warn('Sync: Heartbeat skipped, no device_id found in $ae_loc.native_device.');
+            $events_sess.launcher.heartbeat_info.status = 'error';
             return;
         }
 
@@ -149,8 +174,8 @@
             }
 
             const update_payload: any = {
-                // Use standard toISOString() for unambiguous UTC on server
-                heartbeat: new Date().toISOString()
+                // Use standard SQL format YYYY-MM-DD HH:mm:ss for MySQL compatibility
+                heartbeat: ae_util.iso_datetime_formatter(new Date(), 'datetime_iso')
             };
 
             if (info) {
@@ -177,9 +202,14 @@
             });
 
             last_heartbeat = new Date().toLocaleTimeString();
+            $events_sess.launcher.heartbeat_info = {
+                last_timestamp: last_heartbeat,
+                status: 'success'
+            };
             if (log_lvl > 1) console.log('Sync: Device heartbeat SUCCESS.');
         } catch (err) {
             console.error('Sync: Device heartbeat FAILED:', err);
+            $events_sess.launcher.heartbeat_info.status = 'error';
         }
     }