feat: make manual-images list dynamic and resolve checkmark encoding issues

backend/fix_encoding_chars.py

@@ -0,0 +1,33 @@
+import os
+import glob
+
+def main():
+    uploads_dir = "backend/uploads"
+    if not os.path.exists(uploads_dir):
+        uploads_dir = "uploads"
+
+    manual_pattern = os.path.join(uploads_dir, "manual_label_*.json")
+    manual_files = glob.glob(manual_pattern)
+    fixed_count = 0
+
+    for mf in manual_files:
+        try:
+            with open(mf, "r", encoding="utf-8") as f:
+                content = f.read()
+            
+            if "✓" in content:
+                # Replace with the correct checkmark character
+                content = content.replace("✓", "✓")
+                
+                with open(mf, "w", encoding="utf-8") as f:
+                    f.write(content)
+                
+                print(f"Fixed encoding corruption in: {mf}")
+                fixed_count += 1
+        except Exception as e:
+            print(f"Error fixing {mf}: {e}")
+
+    print(f"Encoding fix completed. Files fixed: {fixed_count}")
+
+if __name__ == "__main__":
+    main()