refined score list styles.

app.py

@@ -396,6 +396,12 @@ CUSTOM_CSS = '''
 	white-space: nowrap;
 	vertical-align: middle;
 }
+/* on hover, reveal the full (otherwise ellipsised) file name */
+.score-list label:hover > span {
+	overflow: visible;
+	white-space: normal;
+	word-break: break-all;
+}
 /* Score List: fixed height with an auto scrollbar, matching the editor's
    18-line viewport (gr.Code lines=18 ≈ 266px). */
 .score-list {