fix: don't use lambda expression

cli/src/zshell/subcommands/scheme.py

@@ -545,7 +545,7 @@ def generate(
 			except (PermissionError, OSError, BlockingIOError):
 				pass
 
-	def smart_mode(image_path: Path) -> str:
+	def smart_mode(image_path: Path | io.BytesIO) -> str:
 		is_dark = ""
 
 		with Image.open(image_path) as img:
@@ -739,7 +739,7 @@ def generate(
 
 		return rendered_outputs
 
-	def seed_from_image(image_path: Path) -> Hct:
+	def seed_from_image(image_path: Path | io.BytesIO) -> Hct:
 		image = Image.open(image_path)
 		pixel_len = image.width * image.height
 		image_data = image.getdata()
@@ -837,11 +837,13 @@ def generate(
 			image_path = image_path or Path(WALL_PATH)
 
 			blob = scheme_thumb_from_db(str(DB_PATH), str(image_path))
-			if blob is not None:
-				open_thumb = lambda: io.BytesIO(blob)
-			else:
-				thumb_path = generate_thumbnail(image_path, THUMB_DIR)
-				open_thumb = lambda: thumb_path
+
+			def open_thumb():
+				if blob is not None:
+					return io.BytesIO(blob)
+				else:
+					thumb_path = generate_thumbnail(image_path, THUMB_DIR)
+					return thumb_path
 
 			seed = seed_from_image(open_thumb())
 			name = "dynamic"