correcting the bugs in calculating fen's

app.py

@@ -16,8 +16,8 @@ FEN_MAPPING = {
     "black-pawn": "p", "black-rook": "r", "black-knight": "n", "black-bishop": "b", "black-queen": "q", "black-king": "k",
     "white-pawn": "P", "white-rook": "R", "white-knight": "N", "white-bishop": "B", "white-queen": "Q", "white-king": "K"
 }
-GRID_BORDER = 5  # Border size in pixels
-GRID_SIZE = 214  # Effective grid size (10px to 214px)
+GRID_BORDER = 0  # Border size in pixels
+GRID_SIZE = 224  # Effective grid size (10px to 214px)
 BLOCK_SIZE = GRID_SIZE // 8  # Each block is ~25px
 X_LABELS = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h']  # Labels for x-axis (a to h)
 Y_LABELS = [8, 7, 6, 5, 4, 3, 2, 1]  # Reversed labels for y-axis (8 to 1)
@@ -30,8 +30,8 @@ def get_grid_coordinate(pixel_x, pixel_y, perspective):
     The perspective argument can adjust for white ('w') or black ('b') viewpoint.
     """
     # Grid settings
-    border = 5  # 10px border
-    grid_size = 214  # Effective grid size (10px to 214px)
+    border = 0  # 10px border
+    grid_size = 224  # Effective grid size (10px to 214px)
     block_size = grid_size // 8  # Each block is ~25px
 
     x_labels = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h']  # Labels for x-axis (a to h)