UI Enhancements.

app/core/fonts.py

@@ -0,0 +1,24 @@
+"""Font loader - registers bundled Quicksand and Open Sans with Qt."""
+import os
+from PyQt6.QtGui import QFontDatabase
+
+_ASSETS_DIR = os.path.join(os.path.dirname(__file__), "..", "..", "assets", "fonts")
+
+_FONT_FILES = [
+    "Quicksand-Regular.ttf",
+    "Quicksand-Medium.ttf",
+    "Quicksand-SemiBold.ttf",
+    "Quicksand-Bold.ttf",
+    "OpenSans-Regular.ttf",
+    "OpenSans-SemiBold.ttf",
+    "OpenSans-Bold.ttf",
+]
+
+
+def load_fonts() -> None:
+    """Register all bundled fonts with QFontDatabase. Call once after QApplication is created."""
+    fonts_dir = os.path.normpath(_ASSETS_DIR)
+    for filename in _FONT_FILES:
+        path = os.path.join(fonts_dir, filename)
+        if os.path.exists(path):
+            QFontDatabase.addApplicationFont(path)