fix(ui): avoid splitting UTF-16 surrogate pairs in session display peer-id tail (#104930)

* fix(ui): avoid splitting UTF-16 surrogate pairs in session display peer-id tail

* test(ui): assert exact UTF-16-safe peer-id tail output

---------

Co-authored-by: chengzhichao-xydt <chengzhichao-xydt@users.noreply.github.com>
Co-authored-by: chengzhichao-xydt <264300353+chengzhichao-xydt@users.noreply.github.com>

ui/src/lib/session-display.test.ts

@@ -26,6 +26,12 @@ describe("resolveSessionDisplayName", () => {
     expect(resolveSessionDisplayName("agent:main:imessage:direct:+4912")).toBe("iMessage · +4912");
   });
 
+  it("does not split UTF-16 surrogate pairs when shortening peer ids", () => {
+    expect(resolveSessionDisplayName("agent:main:telegram:direct:12345😀67890")).toBe(
+      "Telegram · …67890",
+    );
+  });
+
   it("falls back to a friendly name for dashboard sessions instead of the uuid key", () => {
     expect(
       resolveSessionDisplayName("agent:main:dashboard:0f9d5c1e-6d0f-4c9a-9d84-1c2f3a4b5c6d"),

ui/src/lib/session-display.ts

@@ -1,4 +1,5 @@
 // Control UI module implements session display behavior.
+import { sliceUtf16Safe } from "@openclaw/normalization-core/utf16-slice";
 import { normalizeLowercaseStringOrEmpty, normalizeOptionalString } from "./string-coerce.ts";
 
 const CHANNEL_LABELS: Record<string, string> = {
@@ -18,7 +19,7 @@ const KNOWN_CHANNEL_KEYS = Object.keys(CHANNEL_LABELS);
 /** Raw peer ids stay out of the sidebar; keep a short recognizable tail only. */
 function shortenPeerId(identifier: string): string {
   const trimmed = identifier.trim();
-  return trimmed.length <= 10 ? trimmed : `…${trimmed.slice(-6)}`;
+  return trimmed.length <= 10 ? trimmed : `…${sliceUtf16Safe(trimmed, -6)}`;
 }
 
 // Long hex/uuid runs inside keys and node ids are machine ids, not names;