Change back to PNGs

There is no real performance hit, and they are easier for developers.

internal_filesystem/builtin/apps/com.example.launcher/assets/launcher.py

@@ -29,16 +29,8 @@ start = time.ticks_ms()
 
 def load_icon(icon_path):
     with open(icon_path, 'rb') as f:
-        f.seek(12) # first 12 bytes are headers
         image_data = f.read()
         image_dsc = lv.image_dsc_t({
-            "header": {
-                "magic": lv.IMAGE_HEADER_MAGIC,
-                "w": 64,
-                "h": 64,
-                "stride": 64 * 2,
-                "cf": lv.COLOR_FORMAT.RGB565A8
-                },
             'data_size': len(image_data),
             'data': image_data
         })
@@ -79,13 +71,13 @@ for app_dir_fullpath in app_dirs:
     app_cont.set_style_border_width(0, 0)
     app_cont.set_style_pad_all(0, 0)
     # Load and display icon
-    icon_path = f"{app_dir_fullpath}/res/mipmap-mdpi/icon_64x64.bin"
+    icon_path = f"{app_dir_fullpath}/res/mipmap-mdpi/icon_64x64.png"
     image = lv.image(app_cont)
     try:
         image.set_src(load_icon(icon_path))
     except Exception as e:
         print(f"Error loading icon {icon_path}: {e} - loading default icon")
-        icon_path = "/builtin/res/mipmap-mdpi/default_icon_64x64.bin"
+        icon_path = "/builtin/res/mipmap-mdpi/default_icon_64x64.png"
         try:
             image.set_src(load_icon(icon_path))
         except Exception as e: