Revert "feat(tg): 思考块改为可折叠引用块（与工具调用区分）"

This reverts commit 6d00225cc4.

lib/bridge.js

@@ -75,10 +75,8 @@ const defaultSleep = (ms) => new Promise((resolve) => setTimeout(resolve, ms));
 const REASONING_QUOTE_MAX_CHARS = 800;
 /**
  * Assistant message → markdown for delivery. Reasoning (thinking) blocks are
- * kept as EXPANDABLE quotes (`**>`…`||` per Telegram's native markdown spec,
- * `<blockquote expandable>` in HTML mode) so they stay collapsed on the phone
- * and visually distinct from tool-call quotes; ordinary quotes in assistant
- * text remain plain blockquotes.
+ * kept, one `> ` quote line each — Telegram renders them as the accent-bar
+ * quote style the phone user expects for bash/thinking-style chatter.
  */
 function contentToText(content) {
     const parts = [];
@@ -92,13 +90,7 @@ function contentToText(content) {
                 continue;
             if (thinking.length > REASONING_QUOTE_MAX_CHARS)
                 thinking = `${thinking.slice(0, REASONING_QUOTE_MAX_CHARS)}…`;
-            // `||` would open/close spoiler entities in native markdown — neutralize.
-            const lines = thinking.replace(/\|\|/g, '｜｜').split('\n');
-            const last = lines.length - 1;
-            parts.push([
-                '**>💭 思考过程',
-                ...lines.map((line, i) => `> ${line}${i === last ? '||' : ''}`),
-            ].join('\n'));
+            parts.push(thinking.split('\n').map((line) => `> ${line}`).join('\n'));
         }
     }
     return parts.join('\n\n');