Add theme management and settings functionality

- Introduced `ThemeManager` to handle application themes using `ttkthemes`.
- Added `SettingsWindow` for user preferences including theme selection and UI settings.
- Integrated theme selection into the main application with a menu for quick access.
- Enhanced UI components with custom styles based on the selected theme.
- Implemented tooltips for better user guidance across various UI elements.
- Updated dependencies to include `ttkthemes` for improved visual appeal.

src/main.py

@@ -17,6 +17,8 @@ from medicine_management_window import MedicineManagementWindow
 from medicine_manager import MedicineManager
 from pathology_management_window import PathologyManagementWindow
 from pathology_manager import PathologyManager
+from settings_window import SettingsWindow
+from theme_manager import ThemeManager
 from ui_manager import UIManager
 
 
@@ -44,6 +46,9 @@ class MedTrackerApp:
 
         logger.info(f"Log level: {LOG_LEVEL}")
 
+        # Initialize theme manager first
+        self.theme_manager: ThemeManager = ThemeManager(self.root, logger)
+
         if LOG_LEVEL == "DEBUG":
             logger.debug(f"Script name: {sys.argv[0]}")
             logger.debug(f"Logs path: {LOG_PATH}")
@@ -54,7 +59,11 @@ class MedTrackerApp:
         self.medicine_manager: MedicineManager = MedicineManager(logger=logger)
         self.pathology_manager: PathologyManager = PathologyManager(logger=logger)
         self.ui_manager: UIManager = UIManager(
-            root, logger, self.medicine_manager, self.pathology_manager
+            root,
+            logger,
+            self.medicine_manager,
+            self.pathology_manager,
+            self.theme_manager,
         )
         self.data_manager: DataManager = DataManager(
             self.filename, logger, self.medicine_manager, self.pathology_manager
@@ -103,7 +112,7 @@ class MedTrackerApp:
         import tkinter.ttk as ttk
 
         # --- Main Frame ---
-        main_frame: ttk.Frame = ttk.Frame(self.root, padding="10")
+        main_frame: ttk.Frame = ttk.Frame(self.root, padding="10", style="Card.TFrame")
         main_frame.grid(row=0, column=0, sticky="nsew")
 
         # Configure root window grid
@@ -206,9 +215,36 @@ class MedTrackerApp:
             label="Refresh Data", command=self.refresh_data_display, accelerator="F5"
         )
 
+        # Theme menu
+        theme_menu = tk.Menu(menubar, tearoff=0)
+        menubar.add_cascade(label="Theme", menu=theme_menu)
+
+        # Add quick theme options
+        available_themes = self.theme_manager.get_available_themes()
+        current_theme = self.theme_manager.get_current_theme()
+
+        for theme in available_themes:
+            theme_menu.add_radiobutton(
+                label=theme.title(),
+                command=lambda t=theme: self._change_theme(t),
+                value=theme == current_theme,
+            )
+
+        theme_menu.add_separator()
+        theme_menu.add_command(
+            label="More Settings...",
+            command=self._open_settings_window,
+        )
+
         # Help menu
         help_menu = tk.Menu(menubar, tearoff=0)
         menubar.add_cascade(label="Help", menu=help_menu)
+        help_menu.add_command(
+            label="Settings...",
+            command=self._open_settings_window,
+            accelerator="F2",
+        )
+        help_menu.add_separator()
         help_menu.add_command(
             label="Keyboard Shortcuts",
             command=self._show_keyboard_shortcuts,
@@ -237,6 +273,7 @@ class MedTrackerApp:
         self.root.bind("<Delete>", lambda e: self._delete_selected_entry())
         self.root.bind("<Escape>", lambda e: self._clear_selection())
         self.root.bind("<F1>", lambda e: self._show_keyboard_shortcuts())
+        self.root.bind("<F2>", lambda e: self._open_settings_window())
 
         # Make the window focusable so it can receive key events
         self.root.focus_set()
@@ -276,10 +313,24 @@ Table Operations:
 • Double-click: Edit entry
 
 Help:
-• F1: Show this help dialog"""
+• F1: Show this help dialog
+• F2: Open settings window"""
 
         messagebox.showinfo("Keyboard Shortcuts", shortcuts_text, parent=self.root)
 
+    def _change_theme(self, theme_name: str) -> None:
+        """Change the application theme."""
+        if self.theme_manager.apply_theme(theme_name):
+            self.ui_manager.update_status(
+                f"Theme changed to: {theme_name.title()}", "info"
+            )
+            # Refresh the menu to update radio button selection
+            self._setup_menu()
+        else:
+            self.ui_manager.update_status(
+                f"Failed to apply theme: {theme_name}", "error"
+            )
+
     def _show_about_dialog(self) -> None:
         """Show about dialog."""
         about_text = """TheChart - Medication Tracker
@@ -315,6 +366,11 @@ Use Ctrl+S to save entries and Ctrl+Q to quit."""
             self.root, self.medicine_manager, self._refresh_ui_after_config_change
         )
 
+    def _open_settings_window(self) -> None:
+        """Open the settings window."""
+        self.ui_manager.update_status("Opening settings window", "info")
+        SettingsWindow(self.root, self.theme_manager, self.ui_manager)
+
     def _refresh_ui_after_config_change(self) -> None:
         """Refresh UI components after pathology or medicine configuration changes."""
         self.ui_manager.update_status(
@@ -678,9 +734,13 @@ Use Ctrl+S to save entries and Ctrl+Q to quit."""
                     # Fallback - just use all columns
                     display_df = df
 
-                # Batch insert for better performance
-                for _index, row in display_df.iterrows():
-                    self.tree.insert(parent="", index="end", values=list(row))
+                # Batch insert for better performance with alternating row colors
+                for index, row in display_df.iterrows():
+                    # Add alternating row tags for better visibility
+                    tag = "evenrow" if index % 2 == 0 else "oddrow"
+                    self.tree.insert(
+                        parent="", index="end", values=list(row), tags=(tag,)
+                    )
                 logger.debug(f"Loaded {len(display_df)} entries into treeview.")
 
             # Update the graph