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/model_ops.rs

@@ -1148,7 +1148,7 @@ impl super::OpenCADStudio {
 
         if prepared.is_empty() {
             self.command_line.push_output(
-                crate::tf!(
+                crate::t!(
                     "INTERSECT: no positive-area common result; %{count} original object(s) retained.",
                     count = retained_without_change
                 )
@@ -1215,7 +1215,7 @@ impl super::OpenCADStudio {
         self.tabs[i].dirty = true;
         self.refresh_properties();
         self.command_line.push_output(
-            crate::tf!(
+            crate::t!(
                 "INTERSECT: created %{count} result object(s).",
                 count = results.len()
             )
@@ -1423,7 +1423,7 @@ impl super::OpenCADStudio {
         self.tabs[i].dirty = true;
         self.refresh_properties();
         self.command_line.push_output(
-            crate::tf!("UNION: created %{count} result object(s).", count = created.len()).as_ref(),
+            crate::t!("UNION: created %{count} result object(s).", count = created.len()).as_ref(),
         );
         Task::none()
     }
@@ -1695,7 +1695,7 @@ impl super::OpenCADStudio {
         self.tabs[i].dirty = true;
         self.refresh_properties();
         self.command_line.push_output(
-            crate::tf!(
+            crate::t!(
                 "SUBTRACT: created %{count} result object(s).",
                 count = retained.len()
             )
@@ -1928,7 +1928,7 @@ impl super::OpenCADStudio {
         self.tabs[i].dirty = true;
         self.refresh_properties();
         self.command_line.push_output(
-            crate::tf!(
+            crate::t!(
                 "SLICE: created %{count} result object(s).",
                 count = retained.len()
             )