feat: Fill all dates in sales chart including dates with no data (industry best practice)

includes/Api/AnalyticsController.php

@@ -321,20 +321,37 @@ class AnalyticsController {
 			ORDER BY date ASC
 		", $days));
 		
-		// Format sales chart
+		// Create a map of existing data
+		$data_map = [];
+		foreach ($salesChart as $row) {
+			$data_map[$row->date] = [
+				'revenue' => round(floatval($row->revenue), 2),
+				'orders' => intval($row->orders),
+			];
+		}
+		
+		// Fill in ALL dates in the range (including dates with no data)
 		$formatted_sales = [];
 		$total_revenue = 0;
 		$total_orders = 0;
 		
-		foreach ($salesChart as $row) {
-			$revenue = round(floatval($row->revenue), 2);
-			$orders = intval($row->orders);
+		for ($i = $days - 1; $i >= 0; $i--) {
+			$date = date('Y-m-d', strtotime("-{$i} days"));
+			
+			if (isset($data_map[$date])) {
+				$revenue = $data_map[$date]['revenue'];
+				$orders = $data_map[$date]['orders'];
+			} else {
+				// No data for this date, fill with zeros
+				$revenue = 0.00;
+				$orders = 0;
+			}
 			
 			$total_revenue += $revenue;
 			$total_orders += $orders;
 			
 			$formatted_sales[] = [
-				'date' => $row->date,
+				'date' => $date,
 				'revenue' => $revenue,
 				'orders' => $orders,
 			];