feat: HUD

- add tower constants including cost, projectile stats, and duration
- add item buying timer for shop items
- add _draw_status_bar to handle dynamic HP rendering
- add _format_time for MM:SS display

src/settings.py

@@ -30,7 +30,6 @@ DIRECTION_FRAMES: Mapping[Direction, Tuple[int, int, int]] = {
 # Default drawing size and animation speed.
 DEFAULT_SPRITE_HEIGHT: int = 138
 DEFAULT_FRAME_TIME: float = 0.16
-=======
 
 # --- ECTS ---
 START_ECTS_VALUE = 1        # how many ECTS are generated at the beginning
@@ -91,3 +90,10 @@ COLOR_HP_BAR_YELLOW = (255, 255, 0)
 
 HUD_BAR_WIDTH = 100
 HUD_BAR_HEIGHT = 15
+
+HUD_X_OFFSET = 20               # left startpoint for texts
+HUD_BAR_X = 150                 # left startpoint for hp bars
+
+HUD_Y_DOOR = 20
+HUD_Y_ZOMBIE = 50
+HUD_Y_ECTS = 85