#233: file attachment title takes the file name, fallback date.ext

internal/web/static/new.js

@@ -307,21 +307,19 @@ function setAttachedFile(file) {
   attachedFile = file;
   renderFileChip();
   setHidden('file-text-note', false);
-  // #171/#184: title auto-fill — images take the file name; text files
-  // use the language-placeholder convention (e.g. Python.py, fallback
-  // Text.txt). Only when the title is still blank; never overwrite a
-  // typed title.
+  // #233: title auto-fill — the file's own name always wins when the
+  // title is still blank; fallback is date.fileextension (e.g.
+  // 2026-09-10.txt) when the name is missing or unusable. Never
+  // overwrite a typed title.
   if (!$('title').value.trim()) {
-    if (IMAGE_RE.test(file.type)) {
-      $('title').value = file.name;
+    const raw = (file.name || '').trim();
+    if (raw) {
+      $('title').value = raw;
     } else {
-      const lang = LANG_BY_EXT[extOf(file.name)];
-      if (lang) {
-        const fn = defaultFilename(lang);
-        if (fn) $('title').value = fn;
-      } else if (TEXT_EXTS.has(extOf(file.name))) {
-        $('title').value = defaultFilename('text') || 'Text.txt';
-      }
+      const d = new Date();
+      const iso = d.getFullYear() + '-' + String(d.getMonth() + 1).padStart(2, '0') + '-' + String(d.getDate()).padStart(2, '0');
+      const ext = extOf(raw || file.name);
+      $('title').value = ext ? iso + '.' + ext : iso;
     }
   }
   showFileInEditor(file);