fixing CI issues

.gitattributes

@@ -0,0 +1,2 @@
+# Mark EPUB files as binary to prevent any text transformations
+*.epub binary

dreader/managers/document.py

@@ -70,6 +70,9 @@ class DocumentManager:
 
         except Exception as e:
             print(f"Error loading EPUB: {e}")
+            import traceback
+            print(f"Full traceback:")
+            traceback.print_exc()
             return False
 
     def load_html(self, html_string: str, title: str = "HTML Document",

tests/test_settings_overlay.py

@@ -48,6 +48,13 @@ class TestSettingsOverlay(unittest.TestCase):
 
         # Test if it's a valid ZIP
         if test_epub.exists():
+            # Check file magic bytes
+            with open(test_epub, 'rb') as f:
+                first_bytes = f.read(10)
+                print(f"First 10 bytes (hex): {first_bytes.hex()}")
+                print(f"First 10 bytes (ascii): {first_bytes[:4]}")
+                print(f"Is PK header: {first_bytes[:2] == b'PK'}")
+
             try:
                 with zipfile.ZipFile(test_epub, 'r') as zf:
                     print(f"Valid ZIP: True")