feat: synchronize tab titles with saved SQL file renaming (#2739)

- Bidirectional sync between SQL library and tab titles
- Case-insensitive .sql extension via shared ensureSqlExtension
- Revert tab title when rename persistence fails

Close #2648

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/desktop/src/lib/__tests__/savedSql/savedSqlFileName.spec.ts

@@ -0,0 +1,20 @@
+import { describe, expect, it } from "vitest";
+import { ensureSqlExtension, stripSqlExtension } from "@/lib/savedSql/savedSqlFileName";
+
+describe("savedSqlFileName", () => {
+  it("appends .sql when missing", () => {
+    expect(ensureSqlExtension("report")).toBe("report.sql");
+  });
+
+  it("preserves lowercase .sql extension", () => {
+    expect(ensureSqlExtension("report.sql")).toBe("report.sql");
+  });
+
+  it("preserves uppercase .SQL extension without double-appending", () => {
+    expect(ensureSqlExtension("report.SQL")).toBe("report.SQL");
+  });
+
+  it("strips .sql extension case-insensitively", () => {
+    expect(stripSqlExtension("report.SQL")).toBe("report");
+  });
+});

apps/desktop/src/lib/savedSql/savedSqlFileName.ts

@@ -0,0 +1,9 @@
+export function ensureSqlExtension(name: string): string {
+  const trimmed = name.trim();
+  if (!trimmed) return trimmed;
+  return /\.sql$/i.test(trimmed) ? trimmed : `${trimmed}.sql`;
+}
+
+export function stripSqlExtension(name: string): string {
+  return name.replace(/\.sql$/i, "");
+}