feat(main.py): enhance video display to maximize screen usage and center window

main.py

@@ -24,6 +24,10 @@ class MediaGrader:
     FAST_SEEK_MULTIPLIER = 60
     IMAGE_DISPLAY_DELAY_MS = 100
     
+    # Monitor dimensions for full-screen sizing
+    MONITOR_WIDTH = 2560
+    MONITOR_HEIGHT = 1440
+    
     # Timeline configuration
     TIMELINE_HEIGHT = 60
     TIMELINE_MARGIN = 20
@@ -121,15 +125,34 @@ class MediaGrader:
         self.thread_pool = ThreadPoolExecutor(max_workers=4)
     
     def display_with_aspect_ratio(self, frame):
-        """Display frame while maintaining aspect ratio"""
+        """Display frame while maintaining aspect ratio and maximizing screen usage"""
         if frame is None:
             return
             
-        # Log frame dimensions
-        height, width = frame.shape[:2]
+        # Get frame dimensions
+        frame_height, frame_width = frame.shape[:2]
         
-        # Force window to resize to match the frame dimensions
-        cv2.resizeWindow("Media Grader", width, height)
+        # Calculate aspect ratio
+        frame_aspect_ratio = frame_width / frame_height
+        monitor_aspect_ratio = self.MONITOR_WIDTH / self.MONITOR_HEIGHT
+        
+        # Determine if frame is vertical or horizontal relative to monitor
+        if frame_aspect_ratio < monitor_aspect_ratio:
+            # Frame is more vertical than monitor - maximize height
+            display_height = self.MONITOR_HEIGHT
+            display_width = int(display_height * frame_aspect_ratio)
+        else:
+            # Frame is more horizontal than monitor - maximize width
+            display_width = self.MONITOR_WIDTH
+            display_height = int(display_width / frame_aspect_ratio)
+        
+        # Resize window to calculated dimensions
+        cv2.resizeWindow("Media Grader", display_width, display_height)
+        
+        # Center the window on screen
+        x_position = (self.MONITOR_WIDTH - display_width) // 2
+        y_position = (self.MONITOR_HEIGHT - display_height) // 2
+        cv2.moveWindow("Media Grader", x_position, y_position)
         
         # Display the frame
         cv2.imshow("Media Grader", frame)
@@ -1446,7 +1469,7 @@ class MediaGrader:
         cv2.namedWindow("Media Grader", cv2.WINDOW_NORMAL)
         cv2.setMouseCallback("Media Grader", self.mouse_callback)
         
-        # Set initial window size to a reasonable default
+        # Set initial window size to a reasonable default (will be resized on first frame)
         cv2.resizeWindow("Media Grader", 1280, 720)
 
         while self.media_files and self.current_index < len(self.media_files):