Add visual booking calendar (weekly Teams-style view)

- New weekly calendar at /bookings/calendar with time blocks per booking
- Color-coded by worker, overlapping bookings shown side-by-side
- Click booking to see details, edit or delete
- Worker filter dropdown, week navigation (prev/next/today)
- AJAX week loading for smooth navigation
- Link between list view and calendar view

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

application/models/Service_model.php

@@ -795,6 +795,56 @@ class Service_model extends CI_Model {
     return $query->num_rows() > 0;
 }
 
+    public function getBookingsByDateRange($startDate, $endDate, $workerId = null) {
+        $this->load->database();
+
+        $sql = 'SELECT b.*, w.worker_name, w.worker_profile_img
+                FROM bookings b
+                JOIN workers w ON b.worker_id = w.worker_id
+                WHERE b.booking_date BETWEEN ? AND ?';
+        $params = array($startDate, $endDate);
+
+        if ($workerId) {
+            $sql .= ' AND b.worker_id = ?';
+            $params[] = $workerId;
+        }
+
+        $sql .= ' ORDER BY b.booking_date, b.booking_start_time';
+        $query = $this->db->query($sql, $params);
+
+        if ($query->num_rows() == 0) return array();
+
+        $resultsArray = array();
+        foreach ($query->result() as $row) {
+            $resultTmp = (array)$row;
+            $resultTmp['services'] = array();
+            $resultTmp['service_names_joined'] = '';
+
+            if (!empty($resultTmp['service_ids'])) {
+                $servicesArr = unserialize($resultTmp['service_ids']);
+                if (is_array($servicesArr)) {
+                    $names = array();
+                    foreach ($servicesArr as $sid) {
+                        $svc = $this->getServiceById($sid);
+                        if (is_object($svc)) {
+                            $resultTmp['services'][] = (object)array(
+                                'service_name' => $svc->service_name_hu,
+                                'service_price' => $svc->service_price,
+                                'service_time' => $svc->service_time
+                            );
+                            $names[] = $svc->service_name_hu;
+                        }
+                    }
+                    $resultTmp['service_names_joined'] = implode(', ', $names);
+                }
+            }
+
+            $resultsArray[] = (object)$resultTmp;
+        }
+
+        return $resultsArray;
+    }
+