fix(i18n): named-argument messages no longer print a stray placeholder

Eight messages with %{name} arguments went through the positional
formatter, which printed "%3" for a count, and their catalog entries
held %__ocs_fmt_N__ where the named form is expected. They take named
arguments now, and the entries — and those of the selection and HATCHEDIT
prompts with the same fault — use __ocs_arg_<name>__.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/app/annotation_data.rs

@@ -453,7 +453,7 @@ fn collect_drawing_paths(
         return Ok(());
     }
     if !path.is_dir() {
-        return Err(crate::tf!("Data source not found: %{path}", path = path.display()).into_owned());
+        return Err(crate::t!("Data source not found: %{path}", path = path.display()).into_owned());
     }
     for entry in std::fs::read_dir(path).map_err(|error| error.to_string())? {
         let entry = entry.map_err(|error| error.to_string())?;