feat(telegram): add spoiler tag support (#11543)

* feat(telegram): add spoiler tag support

Render markdown ||spoiler|| syntax as <tg-spoiler> tags in Telegram HTML output.

The markdown IR already parses spoiler syntax, but the Telegram renderer was
missing the style marker. This adds the spoiler marker to renderTelegramHtml().

Fixes spoiler text appearing as raw ||text|| instead of hidden text.

* fix: enable Telegram spoiler rendering (#11543) (thanks @ezhikkk)

---------

Co-authored-by: Параша <parasha@openclaw.local>
Co-authored-by: Muhammed Mukhthar CM <mukhtharcm@gmail.com>

src/telegram/format.test.ts

@@ -68,4 +68,14 @@ describe("markdownToTelegramHtml", () => {
     const res = markdownToTelegramHtml("[**bold**](https://example.com)");
     expect(res).toBe('<a href="https://example.com"><b>bold</b></a>');
   });
+
+  it("renders spoiler tags", () => {
+    const res = markdownToTelegramHtml("the answer is ||42||");
+    expect(res).toBe("the answer is <tg-spoiler>42</tg-spoiler>");
+  });
+
+  it("renders spoiler with nested formatting", () => {
+    const res = markdownToTelegramHtml("||**secret** text||");
+    expect(res).toBe("<tg-spoiler><b>secret</b> text</tg-spoiler>");
+  });
 });