fix(plpgsql-deparser): fix PERFORM, INTO, and recfield bugs

- Fix PERFORM SELECT: Strip leading SELECT keyword since PERFORM replaces it
- Fix INTO clause insertion: Use depth-aware scanner to avoid inserting INTO inside subqueries
- Fix recfield qualification: Use recparentno to construct full qualified reference (e.g., new.is_active)

Add comprehensive snapshot tests for all three fixes.

Author: pyramation

packages/plpgsql-deparser/__tests__/__snapshots__/deparser-fixes.test.ts.snap

@@ -0,0 +1,157 @@
+// Jest Snapshot v1, https://jestjs.io/docs/snapshot-testing
+
+exports[`plpgsql-deparser bug fixes INTO clause depth-aware scanner should handle INTO STRICT 1`] = `
+"DECLARE
+  v_id integer;
+BEGIN
+  SELECT id INTO STRICT v_id                  FROM users WHERE email = 'test@example.com';
+  RETURN v_id;
+END"
+`;
+
+exports[`plpgsql-deparser bug fixes INTO clause depth-aware scanner should handle INTO with CTE 1`] = `
+"DECLARE
+  v_total integer;
+BEGIN
+  WITH totals AS (
+          SELECT sum(amount) as total FROM orders
+      )
+      SELECT total INTO v_total              FROM totals;
+  RETURN v_total;
+END"
+`;
+
+exports[`plpgsql-deparser bug fixes INTO clause depth-aware scanner should handle INTO with UNION 1`] = `
+"DECLARE
+  v_count integer;
+BEGIN
+  SELECT count(*) INTO v_count              FROM (
+          SELECT id FROM users
+          UNION ALL
+          SELECT id FROM admins
+      ) combined;
+  RETURN v_count;
+END"
+`;
+
+exports[`plpgsql-deparser bug fixes INTO clause depth-aware scanner should handle INTO with dollar-quoted strings 1`] = `
+"DECLARE
+  v_result text;
+BEGIN
+  SELECT $tag$some FROM text$tag$ INTO v_result               FROM dual;
+  RETURN v_result;
+END"
+`;
+
+exports[`plpgsql-deparser bug fixes INTO clause depth-aware scanner should handle INTO with quoted identifiers 1`] = `
+"DECLARE
+  v_name text;
+BEGIN
+  SELECT "user-name" INTO v_name             FROM "my-schema"."user-table" WHERE id = 1;
+  RETURN v_name;
+END"
+`;
+
+exports[`plpgsql-deparser bug fixes INTO clause depth-aware scanner should insert INTO at correct position for simple SELECT 1`] = `
+"DECLARE
+  v_count integer;
+BEGIN
+  SELECT count(*) INTO v_count              FROM users;
+  RETURN v_count;
+END"
+`;
+
+exports[`plpgsql-deparser bug fixes INTO clause depth-aware scanner should not insert INTO inside subqueries 1`] = `
+"DECLARE
+  v_result integer;
+BEGIN
+  SELECT (SELECT max(id) FROM orders) INTO v_result               FROM users WHERE id = 1;
+  RETURN v_result;
+END"
+`;
+
+exports[`plpgsql-deparser bug fixes PERFORM SELECT fix should handle PERFORM with complex expressions 1`] = `
+"BEGIN
+  PERFORM set_config('search_path', 'public', true);
+  PERFORM nextval('my_sequence');
+  RETURN;
+END"
+`;
+
+exports[`plpgsql-deparser bug fixes PERFORM SELECT fix should handle PERFORM with subquery 1`] = `
+"BEGIN
+  PERFORM 1 FROM users WHERE id = 1;
+  RETURN;
+END"
+`;
+
+exports[`plpgsql-deparser bug fixes PERFORM SELECT fix should strip SELECT keyword from PERFORM statements 1`] = `
+"BEGIN
+  PERFORM pg_sleep(1);
+  RETURN;
+END"
+`;
+
+exports[`plpgsql-deparser bug fixes Record field qualification (recfield) should handle OLD and NEW record references 1`] = `
+"BEGIN
+  IF OLD.status <> NEW.status THEN
+      INSERT INTO audit_log (old_status, new_status) VALUES (OLD.status, NEW.status);
+  END IF;
+  RETURN NEW;
+END"
+`;
+
+exports[`plpgsql-deparser bug fixes Record field qualification (recfield) should handle SELECT INTO with record fields 1`] = `
+"BEGIN
+  SELECT is_active INTO new.is_active                    FROM users WHERE id = NEW.user_id;
+  RETURN NEW;
+END"
+`;
+
+exports[`plpgsql-deparser bug fixes Record field qualification (recfield) should handle custom record types 1`] = `
+"DECLARE
+  r RECORD;
+BEGIN
+  FOR r IN SELECT id, name FROM users LOOP
+      RAISE NOTICE 'User: % - %', r.id, r.name;
+  END LOOP;
+  RETURN;
+END"
+`;
+
+exports[`plpgsql-deparser bug fixes Record field qualification (recfield) should handle record field assignment 1`] = `
+"BEGIN
+  NEW.created_at := COALESCE(NEW.created_at, now());
+  NEW.updated_at := now();
+  NEW.version := COALESCE(OLD.version, 0) + 1;
+  RETURN NEW;
+END"
+`;
+
+exports[`plpgsql-deparser bug fixes Record field qualification (recfield) should qualify record fields with parent record name in triggers 1`] = `
+"BEGIN
+  IF NEW.is_active THEN
+      NEW.updated_at := now();
+  END IF;
+  RETURN NEW;
+END"
+`;
+
+exports[`plpgsql-deparser bug fixes combined scenarios should handle PERFORM with record fields 1`] = `
+"BEGIN
+  PERFORM notify_change(NEW.id, NEW.status);
+  RETURN NEW;
+END"
+`;
+
+exports[`plpgsql-deparser bug fixes combined scenarios should handle SELECT INTO with subquery and record fields 1`] = `
+"DECLARE
+  v_count integer;
+BEGIN
+  SELECT count(*) INTO v_count              FROM orders WHERE user_id = NEW.user_id;
+  IF v_count > 100 THEN
+      NEW.is_premium := true;
+  END IF;
+  RETURN NEW;
+END"
+`;