better faulty encoding detection

copienator/commands/gemini_for_labels.py

@@ -554,11 +554,18 @@ def run(
         client = genai.Client(api_key=api_key)
 
     groups = group_images(images)
+    total_groups = len(groups)
     active: dict[str, tuple[str, float]] = {}
     progress_lock = Lock()
     incomplete: list[Path] = []
     run_started = time.monotonic()
 
+    def print_group_progress(completed: int) -> None:
+        print(
+            f"Label detection progress: {completed}/{total_groups} copy groups completed.",
+            flush=True,
+        )
+
     def report_progress(group: str, description: str, started: float) -> None:
         with progress_lock:
             active[group] = (description, started)
@@ -582,6 +589,7 @@ def run(
             for group_key, files in groups.items()
         }
         pending = set(futures)
+        print_group_progress(0)
         while pending:
             done, pending = wait(pending, timeout=PROGRESS_INTERVAL)
             for future in done:
@@ -591,6 +599,7 @@ def run(
                     future.result()
                 except IncompleteCopyError as exc:
                     incomplete.extend(exc.images)
+            print_group_progress(total_groups - len(pending))
             if pending:
                 now = time.monotonic()
                 with progress_lock: