fix: filename convention

app.py

@@ -103,13 +103,13 @@ def function_export():
         E.g., 'e-r-eddison_the-worm-ouroboros.txt' -> 'ERE-TWO'.
         """
         stem = _strip_advanced(fn)
-        fields = stem.split("_", 1)
+        fields = stem.split("-", 1)
         if len(fields) == 2:
             author, title = fields
         else:
             author = fields[0]
             title = fields[0]
-        initials = lambda s: "".join(part[0].upper() for part in s.split("-"))
+        initials = lambda s: "".join(part[0].upper() for part in s.split("_"))
         return f"{initials(author)}-{initials(title)}"
 
     def format_chunk_label(
@@ -313,11 +313,11 @@ def function_export():
         # infer author & work from the file's true stem (no extension, no "_advanced")
         def _extract_auth_work(fn: str) -> tuple[str, str]:
             base = Path(fn).stem.replace("_advanced", "")
-            auth, *rest = base.split("_", 1)
+            auth, *rest = base.split("-", 1)
             work_raw = rest[0] if rest else base
             return (
-                auth.replace("-", " ").title(),
-                work_raw.replace("-", " ").title(),
+                auth.replace("_", " ").title(),
+                work_raw.replace("_", " ").title(),
             )
 
         aw = df_p["filename"].apply(_extract_auth_work)
@@ -473,8 +473,8 @@ def data_check(
 
     if mode_tabs.value == "Speech vs Non-Speech":
         defaults = [
-            "e-r-eddison_the-worm-ouroboros_advanced.txt",
-            "h-g-wells_the-wonderful-visit_advanced.txt",
+            "e_r_eddison-the_worm_ouroboros_advanced.txt",
+            "h_g_wells-the_wonderful_visit_advanced.txt",
         ]
         df_pre = prepare_files(
             speech_form.value.get("files_s", []),