fix(telegram): migrate group config on supergroup IDs (#906)

Thanks @sleontenko.

Co-authored-by: Stan <sleontenko@users.noreply.github.com>

src/telegram/group-migration.test.ts

@@ -0,0 +1,113 @@
+import { describe, expect, it } from "vitest";
+
+import { migrateTelegramGroupConfig } from "./group-migration.js";
+
+describe("migrateTelegramGroupConfig", () => {
+  it("migrates global group ids", () => {
+    const cfg = {
+      channels: {
+        telegram: {
+          groups: {
+            "-123": { requireMention: false },
+          },
+        },
+      },
+    };
+
+    const result = migrateTelegramGroupConfig({
+      cfg,
+      accountId: "default",
+      oldChatId: "-123",
+      newChatId: "-100123",
+    });
+
+    expect(result.migrated).toBe(true);
+    expect(cfg.channels.telegram.groups).toEqual({
+      "-100123": { requireMention: false },
+    });
+  });
+
+  it("migrates account-scoped groups", () => {
+    const cfg = {
+      channels: {
+        telegram: {
+          accounts: {
+            primary: {
+              groups: {
+                "-123": { requireMention: true },
+              },
+            },
+          },
+        },
+      },
+    };
+
+    const result = migrateTelegramGroupConfig({
+      cfg,
+      accountId: "primary",
+      oldChatId: "-123",
+      newChatId: "-100123",
+    });
+
+    expect(result.migrated).toBe(true);
+    expect(result.scopes).toEqual(["account"]);
+    expect(cfg.channels.telegram.accounts.primary.groups).toEqual({
+      "-100123": { requireMention: true },
+    });
+  });
+
+  it("matches account ids case-insensitively", () => {
+    const cfg = {
+      channels: {
+        telegram: {
+          accounts: {
+            Primary: {
+              groups: {
+                "-123": {},
+              },
+            },
+          },
+        },
+      },
+    };
+
+    const result = migrateTelegramGroupConfig({
+      cfg,
+      accountId: "primary",
+      oldChatId: "-123",
+      newChatId: "-100123",
+    });
+
+    expect(result.migrated).toBe(true);
+    expect(cfg.channels.telegram.accounts.Primary.groups).toEqual({
+      "-100123": {},
+    });
+  });
+
+  it("skips migration when new id already exists", () => {
+    const cfg = {
+      channels: {
+        telegram: {
+          groups: {
+            "-123": { requireMention: true },
+            "-100123": { requireMention: false },
+          },
+        },
+      },
+    };
+
+    const result = migrateTelegramGroupConfig({
+      cfg,
+      accountId: "default",
+      oldChatId: "-123",
+      newChatId: "-100123",
+    });
+
+    expect(result.migrated).toBe(false);
+    expect(result.skippedExisting).toBe(true);
+    expect(cfg.channels.telegram.groups).toEqual({
+      "-123": { requireMention: true },
+      "-100123": { requireMention: false },
+    });
+  });
+});