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/format.js

@@ -12,54 +12,22 @@ function inlineToHtml(text) {
     html = html.replace(/\*\*([^*\n]+)\*\*/g, '<b>$1</b>');
     return html;
 }
-/**
- * Convert `> …` line groups into `<blockquote>` (Telegram renders it with the
- * accent-colored left bar). The native-markdown expandable-quote form
- * (`**>first line` … `last line||`) becomes `<blockquote expandable>` — used
- * for thinking blocks so they stay collapsed and distinct from tool-call
- * quotes (Telegram has no per-message quote color).
- */
-const EXPANDABLE_OPEN = '**>';
+/** Convert `> …` line groups into `<blockquote>` (Telegram renders it with the accent-colored left bar). */
 function blocksToHtml(text) {
     const lines = text.split('\n');
     const out = [];
     let quote = [];
-    let expandable = false;
     const flush = () => {
         if (quote.length === 0)
             return;
-        const open = expandable ? '<blockquote expandable>' : '<blockquote>';
-        out.push(`${open}${inlineToHtml(quote.join('\n'))}</blockquote>`);
+        out.push(`<blockquote>${inlineToHtml(quote.join('\n'))}</blockquote>`);
         quote = [];
-        expandable = false;
     };
     for (const line of lines) {
-        if (line.startsWith(EXPANDABLE_OPEN)) {
-            flush();
-            expandable = true;
-            let content = line.slice(EXPANDABLE_OPEN.length);
-            if (content.endsWith('||')) {
-                quote.push(content.slice(0, -2));
-                flush();
-            }
-            else {
-                quote.push(content);
-            }
-        }
-        else if (line.startsWith('> ')) {
-            let content = line.slice(2);
-            let closed = false;
-            if (expandable && content.endsWith('||')) {
-                content = content.slice(0, -2);
-                closed = true;
-            }
-            quote.push(content);
-            if (closed)
-                flush();
-        }
-        else if (line === '>') {
+        if (line.startsWith('> '))
+            quote.push(line.slice(2));
+        else if (line === '>')
             quote.push('');
-        }
         else {
             flush();
             out.push(inlineToHtml(line));