fix(steami_screen): adjust text width calculation and vertical positioning

Author: Charly-sketch

lib/steami_screen/steami_screen/device.py

@@ -122,7 +122,7 @@ def value(self, val, unit=None, at="CENTER", label=None,
         cx, cy = self.center
         char_w = self.CHAR_W * scale
         char_h = self.CHAR_H * scale
-        tw = len(text) * char_w
+        tw = len(text) * char_w // 2
 
         # Compute vertical position: center the value+unit block
         if unit:
@@ -138,10 +138,10 @@ def value(self, val, unit=None, at="CENTER", label=None,
             y = vy + y_offset
         elif at == "W":
             x = self.width // 4 - tw // 2
-            y = vy
+            y = vy + y_offset
         elif at == "E":
             x = 3 * self.width // 4 - tw // 2
-            y = vy
+            y = vy + y_offset
         else:
             x, y = self._resolve(at, len(text), scale)
 
@@ -155,7 +155,7 @@ def value(self, val, unit=None, at="CENTER", label=None,
 
         # Optional unit below (medium font if backend supports it)
         if unit:
-            unit_y = y + char_h + char_h // 3
+            unit_y = y + char_h
             ux = x + tw // 2 - len(unit) * self.CHAR_W // 2
             if hasattr(self._d, 'draw_medium_text'):
                 self._d.draw_medium_text(unit, ux, unit_y, LIGHT)