feat: Implement comprehensive error logging

src/lib/errorHandler.ts

@@ -100,6 +100,64 @@ export const handleInfo = (
   });
 };
 
+/**
+ * Handle non-critical errors (background failures) that should be logged
+ * to the database WITHOUT showing user toasts
+ * Use this for fire-and-forget operations where user shouldn't be interrupted
+ */
+export const handleNonCriticalError = (
+  error: unknown,
+  context: ErrorContext
+): string => {
+  const errorId = crypto.randomUUID();
+  const shortErrorId = errorId.slice(0, 8);
+  
+  const errorMessage = error instanceof AppError 
+    ? error.userMessage || error.message
+    : error instanceof Error 
+    ? error.message 
+    : 'An unexpected error occurred';
+
+  // Log to console/monitoring (same as handleError)
+  logger.error('Non-critical error occurred', {
+    ...context,
+    error: error instanceof Error ? error.message : String(error),
+    stack: error instanceof Error ? error.stack : undefined,
+    errorId,
+    severity: 'low',
+  });
+
+  // Log to database with breadcrumbs (non-blocking, fire-and-forget)
+  try {
+    const envContext = captureEnvironmentContext();
+    const breadcrumbs = breadcrumbManager.getAll();
+    
+    supabase.rpc('log_request_metadata', {
+      p_request_id: errorId,
+      p_user_id: context.userId || undefined,
+      p_endpoint: context.action,
+      p_method: 'NON_CRITICAL_ERROR',
+      p_status_code: 500,
+      p_error_type: error instanceof Error ? error.name : 'UnknownError',
+      p_error_message: errorMessage,
+      p_error_stack: error instanceof Error ? error.stack : undefined,
+      p_user_agent: navigator.userAgent,
+      p_breadcrumbs: JSON.stringify(breadcrumbs),
+      p_timezone: envContext.timezone,
+      p_referrer: document.referrer || undefined,
+    }).then(({ error: dbError }) => {
+      if (dbError) {
+        logger.error('Failed to log non-critical error to database', { dbError });
+      }
+    });
+  } catch (logError) {
+    logger.error('Failed to capture non-critical error context', { logError });
+  }
+
+  // NO TOAST - This is the key difference from handleError()
+  return errorId;
+};
+
 /**
  * Type-safe error message extraction utility
  * Use this instead of `error: any` in catch blocks