feat: telegram use parse mode ModeMarkdownV2 instead of ModeHTML (#1018)

* feat: telegram use parse mode ModeMarkdownV2 instead of ModeHTML

* handle expandable block quotation starts, add test for all md2 formats

* fix: linter issue

* feat: added flag use_markdown_v2, corrected config, updated
documentation

* move parseChatID to parser_markdown_to_html

* fix: tests and linter issues

* fix: case with ~

* test: fixed Test_markdownToTelegramMarkdownV2

* fix: regex block-quote line  >

* fix: linter issues

* fix: send chunk param mismatched, in edit msg use HTML parse mode too

* fix: remove from .gitignore redundant comment

docs/chat-apps.md

@@ -42,7 +42,8 @@ Talk to your picoclaw through Telegram, Discord, WhatsApp, Matrix, QQ, DingTalk,
     "telegram": {
       "enabled": true,
       "token": "YOUR_BOT_TOKEN",
-      "allow_from": ["YOUR_USER_ID"]
+      "allow_from": ["YOUR_USER_ID"],
+      "use_markdown_v2": false,
     }
   }
 }
@@ -63,6 +64,9 @@ Telegram command menu registration remains channel-local discovery UX; generic c
 
 If command registration fails (network/API transient errors), the channel still starts and PicoClaw retries registration in the background.
 
+**4. Advanced Formatting**
+You can set use_markdown_v2: true to enable enhanced formatting options. This allows the bot to utilize the full range of Telegram MarkdownV2 features, including nested styles, spoilers, and custom fixed-width blocks.
+
 </details>
 
 <details>