Add medicine management functionality with UI and data handling

- Implemented MedicineManagementWindow for adding, editing, and removing medicines.
- Created MedicineManager to handle medicine configurations, including loading and saving to JSON.
- Updated UIManager to dynamically generate medicine-related UI components based on the MedicineManager.
- Enhanced test suite with mock objects for MedicineManager to ensure proper functionality in DataManager tests.
- Added validation for medicine input fields in the UI.
- Introduced default medicine configurations for initial setup.

medicines.json

@@ -0,0 +1,62 @@
+{
+  "medicines": [
+    {
+      "key": "bupropion",
+      "display_name": "Bupropion",
+      "dosage_info": "150/300 mg",
+      "quick_doses": [
+        "150",
+        "300"
+      ],
+      "color": "#FF6B6B",
+      "default_enabled": true
+    },
+    {
+      "key": "hydroxyzine",
+      "display_name": "Hydroxyzine",
+      "dosage_info": "25 mg",
+      "quick_doses": [
+        "25",
+        "50"
+      ],
+      "color": "#4ECDC4",
+      "default_enabled": false
+    },
+    {
+      "key": "gabapentin",
+      "display_name": "Gabapentin",
+      "dosage_info": "100 mg",
+      "quick_doses": [
+        "100",
+        "300",
+        "600"
+      ],
+      "color": "#45B7D1",
+      "default_enabled": false
+    },
+    {
+      "key": "propranolol",
+      "display_name": "Propranolol",
+      "dosage_info": "10 mg",
+      "quick_doses": [
+        "10",
+        "20",
+        "40"
+      ],
+      "color": "#96CEB4",
+      "default_enabled": true
+    },
+    {
+      "key": "quetiapine",
+      "display_name": "Quetiapine",
+      "dosage_info": "25 mg",
+      "quick_doses": [
+        "25",
+        "50",
+        "100"
+      ],
+      "color": "#FFEAA7",
+      "default_enabled": false
+    }
+  ]
+}