fix: robustness cleanup — error handling, resource leaks, config hygiene

.gitignore

@@ -63,5 +63,10 @@ backend/resources/models/mlx/
 temp/
 tmp/
 
-# Batch processing state
-backend/data/batch_state.json
+# Runtime data & user-specific config
+backend/data/
+backend/config/user_settings.json
+backend/config/names.json
+
+# Claude Code
+.claude/

backend/api/files.py

@@ -29,7 +29,7 @@ def _ingest_markdown_note(pipeline_file, original_path: Path, file_size: int):
         note_title = note_result["title"]
         attachments = note_result["attachments"]
     except Exception as e:
-        print(f"Warning: Markdown note parse failed for {original_path.name}: {e}")
+        logger.warning(f"Markdown note parse failed for {original_path.name}: {e}")
         note_text = original_path.read_text(encoding="utf-8", errors="replace")
         note_title = original_path.stem.rstrip(".")
         attachments = []
@@ -81,8 +81,8 @@ def _ingest_markdown_note(pipeline_file, original_path: Path, file_size: int):
         if old_md.resolve() != original_path.resolve():
             try:
                 old_md.unlink()
-            except Exception:
-                pass
+            except Exception as e:
+                logger.warning(f"Could not remove stale .md {old_md.name}: {e}")
 
     # Generate compiled.md with YAML frontmatter
     import datetime as _dt
@@ -117,7 +117,7 @@ def _ingest_markdown_note(pipeline_file, original_path: Path, file_size: int):
     try:
         (folder / "compiled.md").write_text(compiled_content, encoding="utf-8")
     except Exception as e:
-        print(f"Warning: Could not write compiled.md for note {original_path.name}: {e}")
+        logger.warning(f"Could not write compiled.md for note {original_path.name}: {e}")
 
     # Store compiled content and extracted tags in status.json
     try:
@@ -272,7 +272,7 @@ async def upload_files(
                             audio_metadata["duration"] = f"{hours:02d}:{minutes:02d}:{seconds:02d}"
                             audio_metadata["duration_seconds"] = duration_seconds
                 except Exception as e:
-                    print(f"Warning: Could not extract duration for {upload_file.filename}: {e}")
+                    logger.warning(f"Could not extract duration for {upload_file.filename}: {e}")
 
                 status_tracker.add_audio_metadata(pipeline_file.id, audio_metadata)
 

backend/api/system.py

@@ -35,9 +35,9 @@ async def get_system_resources():
             if output_folder.exists():
                 disk_stat = psutil.disk_usage(str(output_folder))
                 disk_usage = (disk_stat.used / disk_stat.total) * 100
-        except:
+        except (OSError, AttributeError, ImportError):
             pass
-        
+
         # CPU temperature (Mac-specific, optional)
         core_temp = None
         try:
@@ -51,7 +51,7 @@ async def get_system_resources():
                         if entries:
                             core_temp = entries[0].current
                             break
-        except:
+        except (OSError, AttributeError):
             pass
 
         return SystemResources(