Fix move_d2r_window to position client area, not outer window

- src/utils/misc.py: move_d2r_window now calculates outer window position
  to place client area at target coords (was incorrectly setting outer
  window to target, shifting client area unpredictably)
- src/bot.py: Call move_d2r_window(5,98) at game start to restore original
  working client area position and prevent 13px offset drift

src/bot.py

@@ -261,9 +261,9 @@ class Bot:
     def on_init(self):
         self._game_stats.log_start_game()
         keyboard.release(Config().char["stand_still"])
-        # Ensure D2R window is at a stable position to prevent template matching drift
+        # Force D2R client area to stable position to prevent offset drift
         from utils.misc import move_d2r_window
-        move_d2r_window(0, 0)
+        move_d2r_window(5, 98)
         wait(0.3)
         # If we're only doing run_level and character is already in-game, skip
         # the town detection and go straight to the run

src/utils/misc.py

@@ -111,8 +111,8 @@ def find_d2r_window(spec: WindowSpec, offset = (0, 0)) -> tuple[int, int]:
                 return (left + offset_x, top + offset_y)
     return None
 
-def move_d2r_window(x, y):
-    """Move D2R window to a specific screen position to prevent offset drift."""
+def move_d2r_window(client_x, client_y):
+    """Move D2R window so the client area is at (client_x, client_y) to prevent offset drift."""
     if os.name == 'nt':
         import ctypes
         from ctypes import wintypes
@@ -122,12 +122,19 @@ def move_d2r_window(x, y):
         EnumWindows(lambda w, l: l.append((w, GetWindowText(w))), window_list)
         for w in window_list:
             if "Diablo II" in w[1]:
-                cr = wintypes.RECT()
-                user32.GetClientRect(w[0], ctypes.byref(cr))
-                w_width = cr.right
-                w_height = cr.bottom
-                SetWindowPos(w[0], HWND_TOPMOST, x, y, w_width, w_height, SWP_SHOWWINDOW)
-                Logger.debug(f"Moved D2R window to ({x}, {y})")
+                # Get current client area position
+                tl = wintypes.POINT()
+                user32.ClientToScreen(w[0], ctypes.byref(tl))
+                # Get window dimensions
+                wr = wintypes.RECT()
+                user32.GetWindowRect(w[0], ctypes.byref(wr))
+                w_width = wr.right - wr.left
+                w_height = wr.bottom - wr.top
+                # Calculate outer window position to place client area at target
+                outer_x = client_x - (tl.x - wr.left)
+                outer_y = client_y - (tl.y - wr.top)
+                SetWindowPos(w[0], HWND_TOPMOST, outer_x, outer_y, w_width, w_height, SWP_SHOWWINDOW)
+                Logger.debug(f"Moved D2R client area to ({client_x}, {client_y})")
                 return True
     return False