Scope the wider processing dialog to the Models tab

The canvas needed more room, but the width lives on the shared
DialogContent, so the Batch tab — untouched by this PR — inherited it and
rendered its two-column layout with unused horizontal space. Widen only
while the Models tab is active.

Author: giswqs

apps/geolibre-desktop/src/components/processing/ModelBuilderDialog.tsx

@@ -179,7 +179,9 @@ export function ModelBuilderDialog({ mapControllerRef }: ModelBuilderDialogProps
         if (!next) setOpen(false);
       }}
     >
-      <DialogContent className="max-w-5xl">
+      {/* Only the Models tab needs the extra width for the workflow canvas; the
+          Batch tab keeps its original two-column width. */}
+      <DialogContent className={mode === "models" ? "max-w-5xl" : "max-w-3xl"}>
         <DialogHeader>
           <DialogTitle>{t("processing.modelBuilder.title")}</DialogTitle>
           <DialogDescription>{t("processing.modelBuilder.description")}</DialogDescription>