fix(desktop): open streaming sql executor for oversized sql files

Closes #8100

apps/desktop/src/composables/useLargeSqlFileFallback.ts

@@ -0,0 +1,34 @@
+import { useI18n } from "vue-i18n";
+import { useConnectionStore } from "@/stores/connectionStore";
+import { useToast } from "@/composables/useToast";
+import { resolveExternalSqlFileTarget, unassociatedExternalSqlFileTarget } from "@/lib/sql/externalSqlFileTarget";
+import { formatSqlFileSize, isExternalSqlFileTooLargeError, isSqlFilePath } from "@/lib/sql/sqlFileOpen";
+
+/**
+ * Editor-oversized external SQL files are not a dead end: route them to the
+ * streaming Execute SQL File dialog, mirroring SqlFilePanel's fallback for
+ * files the editor cannot load.
+ */
+export function useLargeSqlFileStreamingFallback() {
+  const { t } = useI18n();
+  const connectionStore = useConnectionStore();
+  const { toast } = useToast();
+
+  function openInStreamingExecutor(path: string, sizeBytes: number) {
+    const target = resolveExternalSqlFileTarget(path, (savedConnectionId) => !!connectionStore.getConfig(savedConnectionId), unassociatedExternalSqlFileTarget());
+    connectionStore.sqlFileSource = {
+      connectionId: target.connectionId,
+      database: target.database,
+      filePath: path,
+    };
+    toast(t("sqlFile.largeFileExecutionOpened", { size: formatSqlFileSize(sizeBytes) }), 6000);
+  }
+
+  function openInStreamingExecutorOnTooLarge(path: string | undefined, error: unknown): boolean {
+    if (!path || !isExternalSqlFileTooLargeError(error) || !isSqlFilePath(path)) return false;
+    openInStreamingExecutor(path, error.sizeBytes);
+    return true;
+  }
+
+  return { openInStreamingExecutor, openInStreamingExecutorOnTooLarge };
+}