refactor(desktop): organize lib modules by domain

apps/desktop/src/lib/sql/sqlFileOpen.ts

@@ -0,0 +1,14 @@
+export function isSqlFilePath(path: string): boolean {
+  return /\.sql$/i.test(path.trim());
+}
+
+export function sqlFileTitleFromPath(path: string): string {
+  const trimmed = path.trim();
+  const normalized = trimmed.replace(/\\/g, "/");
+  const name = normalized.split("/").filter(Boolean).pop();
+  return name || "script.sql";
+}
+
+export function externalSqlFilePaths(paths: string[]): string[] {
+  return paths.filter(isSqlFilePath);
+}