fix: don't crash the UI on output files with custom names

create_text2music_ui() sorted the saved *_input_params.json files with
int(name.split('_')[1]), which assumes the generated
output_<timestamp>_<idx>_ shape. Output names are user-controlled — via
infer.py --output_path or a save_path from the UI — so any other name
raised ValueError while the Blocks were being built and took the whole
interface down before it could start:

    ValueError: invalid literal for int() with base 10: 'base'

Sort by mtime instead. That is what "previous generated input params"
means anyway (newest first) and it works for any filename; a file that
disappears between listdir() and getmtime() sorts last rather than
raising.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

acestep/ui/components.py

@@ -101,7 +101,17 @@ def create_text2music_ui(
         if not os.path.isdir(output_file_dir):
             os.makedirs(output_file_dir, exist_ok=True)
         json_files = [f for f in os.listdir(output_file_dir) if f.endswith('.json')]
-        json_files.sort(reverse=True, key=lambda x: int(x.split('_')[1]))
+
+        def _mtime(name):
+            # Output filenames are user-controlled (infer.py --output_path, or the
+            # save_path passed from the UI), so a timestamp cannot be parsed out of
+            # them: doing so used to raise ValueError and take the whole UI down.
+            try:
+                return os.path.getmtime(os.path.join(output_file_dir, name))
+            except OSError:
+                return 0.0
+
+        json_files.sort(key=_mtime, reverse=True)
         output_files = gr.Dropdown(choices=json_files, label="Select previous generated input params", scale=9, interactive=True)
         load_bnt = gr.Button("Load", variant="primary", scale=1)