feat(editor): handle tabs after connection disconnect

apps/desktop/src/lib/tabs/__tests__/deletedConnectionTabs.spec.ts

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+import { describe, expect, it } from "vitest";
+import { deletedConnectionTabKeepMode } from "@/lib/tabs/deletedConnectionTabs";
+
+describe("deletedConnectionTabKeepMode", () => {
+  it("maps each delete-time tab handling mode to its keep scope", () => {
+    expect(deletedConnectionTabKeepMode("close-tabs")).toBe("none");
+    expect(deletedConnectionTabKeepMode("keep-sql-tabs")).toBe("sql");
+    expect(deletedConnectionTabKeepMode("keep-pinned-sql-tabs")).toBe("pinned-sql");
+    expect(deletedConnectionTabKeepMode("keep-all-tabs")).toBe("all");
+  });
+});

apps/desktop/src/lib/tabs/deletedConnectionTabs.ts

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+import type { DeleteConnectionTabHandlingMode } from "@/stores/settingsStore";
+
+/**
+ * 删除连接时对已打开页签的保留范围。
+ *
+ * 与「断开连接」不同，删除后连接配置已从磁盘移除、无法再重连，因此被保留下来的
+ * SQL 页签只是草稿工作区；它们会记录原连接名，等新建同名连接时再重新绑定。
+ *
+ * - `none`：关闭全部页签
+ * - `sql`：保留全部 SQL 页签（清空结果），其余关闭
+ * - `pinned-sql`：只保留固定的 SQL 页签（清空结果），其余关闭
+ * - `all`：不关闭任何页签，保留 SQL 文本与当前结果，只回滚事务
+ */
+export type DeletedConnectionTabKeepMode = "none" | "sql" | "pinned-sql" | "all";
+
+export function deletedConnectionTabKeepMode(mode: DeleteConnectionTabHandlingMode): DeletedConnectionTabKeepMode {
+  if (mode === "keep-sql-tabs") return "sql";
+  if (mode === "keep-pinned-sql-tabs") return "pinned-sql";
+  if (mode === "keep-all-tabs") return "all";
+  return "none";
+}