fix(tagging): measured GPU rate, and an ended image-tags job shows no time left (#379)

The live check measured WD14 on CUDA at 0.167 s per image (100 images in
16.7 s with the model load), so the review estimate uses 0.17 s. A finished
or cancelled Auto-tag/Add tags job kept "Processing file N of N · about X
min left"; it now ends with "<verb> <state> · N files processed".

Part of #379

py/api/image_tag_jobs.py

@@ -669,11 +669,15 @@ class ImageTagJobsMixin:
                     job.finish("failed")
                     return
             if not await self._tag_each_file(run):
+                job.update(status_line=STORAGE_RESTORED)
                 job.log_line(f"{verb} stopped · {STORAGE_RESTORED}")
                 job.finish("failed")
                 return
             state = "cancelled" if job.cancelled else "finished"
-            job.log_line(f"{verb} {state} · {_plural(job.processed, 'file')} processed")
+            # An ended job never keeps the loop's "about X min left" (#379).
+            ended = f"{verb} {state} · {_plural(job.processed, 'file')} processed"
+            job.update(status_line=ended)
+            job.log_line(ended)
             job.publish({"type": state, "progress": job.progress})
             job.finish(state)
         finally: