fix: route all console.error through ErrorHandler for consistent tracking

Converted 35+ raw console.error calls to use ErrorHandler.logError() across
12 files. ErrorHandler provides structured logging, local error storage,
and error tracking integration.

Files:
- app-selector.js: 4 errors (fetch templates, port check, suggested port, deploy)
- globals.js: 2 errors (CSRF token get/add)
- service-credentials.js: 2 errors (save/clear credentials)
- totp-settings.js: 4 errors (TOTP setup, session duration, disable, AuthCard)
- notification-settings.js: 2 errors (load config, load history)
- setup-wizard.js: 2 errors (save config to server)
- progress-tracker.js: 4 errors (storage read/write/session/fallback)
- tooltip-definitions.js: 2 errors (validation, condition eval)
- tour-manager.js: 2 errors (Driver.js not loaded, tooltip not found)
- theme-adapter.js: 1 error (theme change callback)
- weather.js: 1 error (weather update)
- onboarding.js: removed duplicate console.error, fixed 2 remaining calls

All console.error calls in the DashCaddy frontend now go through ErrorHandler.

status/js/notification-settings.js

@@ -1,5 +1,6 @@
 // ========== NOTIFICATION SETTINGS ==========
 (function() {
+  const errorHandler = new ErrorHandler();
   // Inject modal HTML
   injectModal('notifications-modal', `<div id="notifications-modal" class="weather-modal">
     <div class="weather-modal-content" style="min-width: 550px; max-width: 650px;">
@@ -255,7 +256,7 @@
         document.getElementById('event-deploy-failed').checked = config.events?.deploymentFailed !== false;
       }
     } catch (error) {
-      console.error('Failed to load notification config:', error);
+      errorHandler.logError('[Notifications] Load Config', error, { function: 'loadConfig' });
     }
   }
 
@@ -289,7 +290,7 @@
         container.innerHTML = '<div style="color: var(--muted); text-align: center; padding: 20px;">No notifications yet</div>';
       }
     } catch (error) {
-      console.error('Failed to load notification history:', error);
+      errorHandler.logError('[Notifications] Load History', error, { function: 'loadHistory' });
     }
   }