refactor: prune legacy group targets

src/telegram/inline-buttons.test.ts

@@ -21,7 +21,6 @@ describe("resolveTelegramTargetChatType", () => {
 
   it("handles tg/group prefixes and topic suffixes", () => {
     expect(resolveTelegramTargetChatType("tg:5232990709")).toBe("direct");
-    expect(resolveTelegramTargetChatType("group:-123456789")).toBe("group");
     expect(resolveTelegramTargetChatType("telegram:group:-1001234567890")).toBe("group");
     expect(resolveTelegramTargetChatType("telegram:group:-1001234567890:topic:456")).toBe("group");
     expect(resolveTelegramTargetChatType("-1001234567890:456")).toBe("group");

src/telegram/targets.test.ts

@@ -11,6 +11,10 @@ describe("stripTelegramInternalPrefixes", () => {
     expect(stripTelegramInternalPrefixes("telegram:group:-100123")).toBe("-100123");
   });
 
+  it("does not strip group prefix without telegram prefix", () => {
+    expect(stripTelegramInternalPrefixes("group:-100123")).toBe("group:-100123");
+  });
+
   it("is idempotent", () => {
     expect(stripTelegramInternalPrefixes("@mychannel")).toBe("@mychannel");
   });

src/telegram/targets.ts

@@ -5,8 +5,19 @@ export type TelegramTarget = {
 
 export function stripTelegramInternalPrefixes(to: string): string {
   let trimmed = to.trim();
+  let strippedTelegramPrefix = false;
   while (true) {
-    const next = trimmed.replace(/^(telegram|tg|group):/i, "").trim();
+    const next = (() => {
+      if (/^(telegram|tg):/i.test(trimmed)) {
+        strippedTelegramPrefix = true;
+        return trimmed.replace(/^(telegram|tg):/i, "").trim();
+      }
+      // Legacy internal form: `telegram:group:<id>` (still emitted by session keys).
+      if (strippedTelegramPrefix && /^group:/i.test(trimmed)) {
+        return trimmed.replace(/^group:/i, "").trim();
+      }
+      return trimmed;
+    })();
     if (next === trimmed) return trimmed;
     trimmed = next;
   }