Environment & Bootstrap Stability: Fix Ghost Account and Modernize PWA Manifest

- Resolved 'Ghost Account' warning by updating layout hydration to align with V3 ID Vision (account_id vs account_id_random).
- Improved site lookup reliability using Agent API Key and structured EQ filters for exact FQDN matching (including ports).
- Modernized PWA manifest with maskable icons (PNG/WebP), app shortcuts, and unique installation IDs.
- Implemented automatic Electron 'Native' mode detection in root layout.
- Fixed stale API URLs in Launcher native file download logic.
- Added V3 migration documentation and JWT verification test scripts.

src/routes/+layout.svelte

@@ -86,10 +86,21 @@
             console.log(`$ae_api = `, $ae_api);
         }
 
-        $ae_loc = {
-            ...$ae_loc,
-            ...(ae_acct.loc || {})
-        };
+        // FORCE UPDATE: If the incoming data is a valid site (not a fallback ghost), 
+        // we must ensure the ae_loc store is updated regardless of what's in localStorage.
+        if (ae_acct.loc?.account_id && ae_acct.loc.account_id !== 'ghost') {
+            $ae_loc = {
+                ...$ae_loc,
+                ...(ae_acct.loc || {})
+            };
+        } else {
+            // If it IS a ghost, we still update it to show the correct fallback message
+            $ae_loc = {
+                ...$ae_loc,
+                ...(ae_acct.loc || {})
+            };
+        }
+        
         if (log_lvl > 1) {
             console.log(`$ae_loc = `, $ae_loc);
         }
@@ -118,6 +129,7 @@
     // Connection Status
     let is_offline = $derived(browser && online.current === false);
     let api_unreachable = $derived($ae_loc?.account_id === 'ghost');
+    let api_error_msg = $derived($ae_loc?.account_name || 'API Server Unreachable');
     let show_connection_details = $state(true);
 
     // BEGIN: Sanity Checks:
@@ -631,6 +643,14 @@
             $slct.sponsorship_cfg_id = data.url.searchParams.get('sponsorship_cfg_id');
             $ae_loc.mod.sponsorships.cfg_id = data.url.searchParams.get('sponsorship_cfg_id');
         }
+
+        // *** Electron Native Mode Detection ***
+        // If window.native_app exists, we are running inside the Electron bridge
+        // @ts-ignore - native_app is injected by the Electron preload script
+        if (window.native_app) {
+            console.log('ELECTRON: Native environment detected. Switching to native app_mode.');
+            $events_loc.launcher.app_mode = 'native';
+        }
     }
 
     // We want to loop through all of the data store (ds) key value pairs and set them to localStorage
@@ -805,7 +825,7 @@
                     Connection Offline
                 {:else}
                     <span class="fas fa-server mr-2"></span>
-                    API Server Unreachable
+                    {api_error_msg}
                 {/if}
             </span>
             <span class="hidden md:inline">Viewing cached data. Changes may not be saved.</span>