feat: Implement photo capture functionality

Implement the logic for capturing and saving photos from the live preview stream.

- Add `save_photo` method to `MediaRepository` to handle file saving and database updates.
- `MainController` now tracks the selected color and the latest camera frame.
- The "Take Photo" button is enabled only when a color is selected.
- Pressing the button saves the current preview frame to the correct media folder and refreshes the thumbnail list.
- Fixes indentation issues in `main_controller.py` caused by previous faulty replacements.

controllers/main_controller.py

@@ -19,6 +19,10 @@ class MainController:
         self.media_repo = MediaRepository()
         self.camera_manager = CameraManager()
 
+        # --- State ---
+        self.selected_color_name: str | None = None
+        self._latest_pixmap: QPixmap | None = None
+
         # --- UI Widgets ---
         self.color_list: ColorListWidget = view.color_list_widget
         self.thumbnail_list: ThumbnailListWidget = view.thumbnail_widget
@@ -33,6 +37,9 @@ class MainController:
         self.db.connect()
         self.media_repo.sync_media()
 
+        # Disable button by default
+        self.photo_button.setEnabled(False)
+
         # Initialize state machine
         self.state: CameraState = NoCamerasState()
         self.state.enter_state(self)
@@ -77,6 +84,9 @@ class MainController:
 
     @Slot(str)
     def on_color_selected(self, color_name: str):
+        self.selected_color_name = color_name
+        self.photo_button.setEnabled(True)
+
         color_id = self.db.get_color_id(color_name)
         if color_id is not None:
             media_items = self.db.get_media_for_color(color_id)
@@ -109,7 +119,8 @@ class MainController:
 
     @Slot(QPixmap)
     def on_frame_ready(self, pixmap: QPixmap):
-        """Displays a new frame from the camera."""
+        """Displays a new frame from the camera and stores it."""
+        self._latest_pixmap = pixmap
         self.split_view.set_live_image(pixmap)
 
     @Slot(str)
@@ -151,7 +162,6 @@ class MainController:
             self.on_camera_error("No cameras detected.")
             return
         
-        # For now, just start the first detected camera.
         camera_id = detected_cameras[0]['id']
         self.camera_manager.start_camera(camera_id)
 
@@ -161,7 +171,17 @@ class MainController:
 
     def take_photo(self):
         """Takes a photo with the active camera."""
-        print("Taking photo...") # Placeholder
-        # This needs to be implemented in CameraManager and called here.
-        # e.g., self.camera_manager.take_photo()
-        self.split_view.toggle_live_view() # This seems like a UI toggle, maybe rename?
+        if self.selected_color_name is None:
+            print("Cannot take photo: No color selected.")
+            # Optionally: show a message to the user in the UI
+            return
+
+        if self._latest_pixmap is None or self._latest_pixmap.isNull():
+            print("Cannot take photo: No frame available.")
+            return
+
+        print(f"Taking photo for color: {self.selected_color_name}")
+        self.media_repo.save_photo(self._latest_pixmap, self.selected_color_name)
+        
+        # Refresh thumbnail list
+        self.on_color_selected(self.selected_color_name)