feat(admin): stabilize blog and admin patterns

TaxBaik.Web/wwwroot/js/admin-session.js

@@ -21,51 +21,9 @@ window.taxbaikAdminSession = {
     },
 
     showLoading: function () {
-        if (document.documentElement.classList.contains('admin-login-route')) {
-            window.taxbaikAdminSession.hideLoading();
-            return;
-        }
-
-        const overlay = document.getElementById('blazor-loading');
-        if (!overlay) return;
-
-        // Show overlay immediately
-        overlay.classList.add('show');
-
-        // Check if page is already ready (cached state on fast nav)
-        const pageReady =
-            document.querySelector('.admin-page-hero') !== null ||
-            document.querySelector('.admin-login-page') !== null;
-        if (pageReady) {
-            // Page already rendered, hide immediately
-            window.taxbaikAdminSession.hideLoading();
-            return;
-        }
-
-        // Start observer to catch future mutations
-        if (window._taxbaikLoadingObserver) {
-            window._taxbaikLoadingObserver.disconnect();
-        }
-        window._taxbaikLoadingObserver = new MutationObserver(function () {
-            const pageReady =
-                document.querySelector('.admin-page-hero') !== null ||
-                document.querySelector('.admin-login-page') !== null;
-            if (pageReady) {
-                window.taxbaikAdminSession.hideLoading();
-            }
-        });
-        window._taxbaikLoadingObserver.observe(document.body, {
-            childList: true,
-            subtree: true
-        });
-
-        // Safety fallback: hide after 3 seconds regardless.
-        if (window._taxbaikLoadingTimeout) {
-            clearTimeout(window._taxbaikLoadingTimeout);
-        }
-        window._taxbaikLoadingTimeout = setTimeout(function () {
-            window.taxbaikAdminSession.hideLoading();
-        }, 3000);
+        // Route transitions are handled by Blazor; avoid full-screen overlays
+        // that block drawer interaction and make the app feel frozen.
+        window.taxbaikAdminSession.hideLoading();
     },
 
     hideLoading: function () {
@@ -93,9 +51,8 @@ window.taxbaikAdminSession = {
             window.taxbaikAdminSession.hideLoading();
         }
 
-        // Show loading on initial page load — overlay has 'show' from HTML,
-        // but we still need to set up the observer to detect when to hide it.
-        window.taxbaikAdminSession.showLoading();
+        // Keep the initial overlay hidden unless explicitly enabled elsewhere.
+        window.taxbaikAdminSession.hideLoading();
 
         const modal = document.getElementById('components-reconnect-modal');
         if (!modal) return;