Feat: add export functionality with GUI for data and graphs

- Implemented ExportWindow class for exporting data and graphs in various formats (JSON, XML, PDF).
- Integrated ExportManager to handle export logic.
- Added export option in the main application menu.
- Enhanced user interface with data summary and export options.
- Included error handling and success messages for export operations.
- Updated dependencies in the lock file to include reportlab and lxml for PDF generation.

src/main.py

@@ -9,6 +9,8 @@ import pandas as pd
 
 from constants import LOG_CLEAR, LOG_LEVEL, LOG_PATH
 from data_manager import DataManager
+from export_manager import ExportManager
+from export_window import ExportWindow
 from graph_manager import GraphManager
 from init import logger
 from medicine_management_window import MedicineManagementWindow
@@ -117,6 +119,15 @@ class MedTrackerApp:
             graph_frame, self.medicine_manager, self.pathology_manager
         )
 
+        # Initialize export manager
+        self.export_manager: ExportManager = ExportManager(
+            self.data_manager,
+            self.graph_manager,
+            self.medicine_manager,
+            self.pathology_manager,
+            logger,
+        )
+
         # --- Create Input Frame ---
         input_ui: dict[str, Any] = self.ui_manager.create_input_frame(main_frame)
         self.input_frame: ttk.Frame = input_ui["frame"]
@@ -152,6 +163,13 @@ class MedTrackerApp:
         menubar = tk.Menu(self.root)
         self.root.config(menu=menubar)
 
+        # File menu
+        file_menu = tk.Menu(menubar, tearoff=0)
+        menubar.add_cascade(label="File", menu=file_menu)
+        file_menu.add_command(label="Export Data...", command=self._open_export_window)
+        file_menu.add_separator()
+        file_menu.add_command(label="Exit", command=self.handle_window_closing)
+
         # Tools menu
         tools_menu = tk.Menu(menubar, tearoff=0)
         menubar.add_cascade(label="Tools", menu=tools_menu)
@@ -162,6 +180,10 @@ class MedTrackerApp:
             label="Manage Medicines...", command=self._open_medicine_manager
         )
 
+    def _open_export_window(self) -> None:
+        """Open the export window."""
+        ExportWindow(self.root, self.export_manager)
+
     def _open_pathology_manager(self) -> None:
         """Open the pathology management window."""
         PathologyManagementWindow(