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.

core/media.py

@@ -1,5 +1,7 @@
 from pathlib import Path
 import shutil
+from datetime import datetime
+from PySide6.QtGui import QPixmap
 from core.database import db_manager
 
 MEDIA_DIR = Path("media")
@@ -9,6 +11,31 @@ class MediaRepository:
     def __init__(self):
         self.db = db_manager
 
+    def save_photo(self, pixmap: QPixmap, color_name: str):
+        """Saves a pixmap to the media directory for the given color."""
+        color_id = self.db.get_color_id(color_name)
+        if color_id is None:
+            print(f"Error: Could not find color ID for {color_name}")
+            return
+
+        # Create directory if it doesn't exist
+        color_dir = MEDIA_DIR / color_name
+        color_dir.mkdir(parents=True, exist_ok=True)
+
+        # Generate unique filename
+        timestamp = datetime.now().strftime("%Y%m%d_%H%M%S_%f")
+        filename = f"photo_{timestamp}.jpg"
+        file_path = color_dir / filename
+
+        # Save the pixmap
+        if not pixmap.save(str(file_path), "JPG", 95):
+            print(f"Error: Failed to save pixmap to {file_path}")
+            return
+
+        # Add to database
+        self.db.add_media(color_id, str(file_path), 'photo')
+        print(f"Saved photo to {file_path}")
+
     def sync_media(self):
         disk_colors = {d.name for d in MEDIA_DIR.iterdir() if d.is_dir()}
         db_colors = {c["name"] for c in self.db.get_all_colors()}