refactor: Fix import ordering and code formatting with ruff

Organize imports in render.py and scroll.py to meet ruff style requirements.
Add blank lines for code formatting compliance.

engine/render.py

@@ -15,6 +15,7 @@ from engine.sources import NO_UPPER, SCRIPT_FONTS, SOURCE_LANGS
 from engine.terminal import RST
 from engine.translate import detect_location_language, translate_headline
 
+
 # ─── GRADIENT ─────────────────────────────────────────────
 def _color_codes_to_ansi(color_codes):
     """Convert a list of 256-color codes to ANSI escape code strings.
@@ -80,6 +81,7 @@ def _default_magenta_gradient():
         "\033[2;38;5;235m",  # near black
     ]
 
+
 # ─── FONT LOADING ─────────────────────────────────────────
 _FONT_OBJ = None
 _FONT_OBJ_KEY = None