fix(phase1): add logging, remove unused import, add error handling

backend/services/image_storage.py

@@ -1,9 +1,9 @@
 """Image storage utilities for managing image files and directory structure."""
+import logging
 import re
 import uuid
 from pathlib import Path
 from typing import List, Optional
-from urllib.parse import quote
 
 # Root directory for all images
 IMAGES_ROOT = Path("images")
@@ -84,10 +84,8 @@ def get_unique_filename(
     # Build the base filename without UUID
     base_filename = f"{sanitized_name}_{variant}.jpg"
 
-    # Check for collision (case-insensitive)
-    existing_lower = [f.lower() for f in existing_files]
-
-    if base_filename.lower() not in existing_lower:
+    # Check for collision (existing_files should already be lowercased)
+    if base_filename.lower() not in existing_files:
         # No collision
         return base_filename
 
@@ -116,7 +114,7 @@ def ensure_image_directories() -> None:
     except Exception:
         # If get_categories fails (e.g., DB not ready), just create root
         # Categories will be created on-demand in save_image
-        pass
+        logging.exception("Failed to ensure image directories")
 
 
 def save_image(
@@ -158,12 +156,18 @@ def save_image(
     # Get existing files in the category
     existing_files = [f.name for f in cat_dir.iterdir() if f.is_file()]
 
+    # Pre-lowercase existing filenames to avoid redundant conversions in get_unique_filename
+    existing_files_lower = [f.lower() for f in existing_files]
+
     # Get unique filename
-    unique_filename = get_unique_filename(filename_base, sanitized_category, existing_files, variant)
+    unique_filename = get_unique_filename(filename_base, sanitized_category, existing_files_lower, variant)
 
     # Write file
     file_path = cat_dir / unique_filename
+    try:
         file_path.write_bytes(file_bytes)
+    except OSError as e:
+        raise IOError(f"Failed to write image to {file_path}: {str(e)}")
 
     # Return relative path with forward slashes
     relative_path = f"/images/{sanitized_category}/{unique_filename}"