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/service-credentials.js

@@ -1,5 +1,6 @@
 // ===== SERVICE CREDENTIALS =====
 (function() {
+  const errorHandler = new ErrorHandler();
   injectModal('folder-browser-modal', `<div id="folder-browser-modal" class="weather-modal">
     <div class="weather-modal-content" style="min-width: 500px; max-width: 700px; max-height: 80vh;">
       <h3>📂 Browse for Media Folders</h3>
@@ -433,7 +434,7 @@
 
       await loadServiceCreds(currentService);
     } catch (e) {
-      console.error('Failed to save credentials:', e);
+      errorHandler.logError('[ServiceCredentials] Save', e, { function: 'saveCredentials' });
       showError('Failed to save: ' + (e.message || 'Unknown error'));
     }
     saveBtn.textContent = 'Save';
@@ -460,7 +461,7 @@
       if (btn) btn.classList.remove('has-creds');
       await loadServiceCreds(currentService);
     } catch (e) {
-      console.error('Failed to clear credentials:', e);
+      errorHandler.logError('[ServiceCredentials] Clear', e, { function: 'clearCredentials' });
       showError('Failed to clear: ' + (e.message || 'Unknown error'));
     }
   });