feat: implement real-time message editing streaming (like OpenClaw)

src/bot/message-sender.js

@@ -46,44 +46,52 @@ export async function sendStreamingMessage(ctx, text, options = {}) {
   if (!text) return;
 
   const { 
-    delay = 100, 
-    minDelay = 50, 
-    maxDelay = 250,
-    charMode = false // Set to true for character-by-character, false for word-by-word
+    delay = 80, 
+    minDelay = 40, 
+    maxDelay = 150,
+    charMode = false // Set to true for character-by-character
   } = options;
 
   try {
-    // Send initial "typing..." indicator
-    const sendTyping = () => ctx.api.sendChatAction(ctx.chat.id, 'typing').catch(() => {});
+    // Send initial placeholder message
+    const sentMsg = await ctx.reply('⌨️  Typing...', { parse_mode: 'Markdown' });
+    
+    let sentText = '';
     
     if (charMode) {
       // Character-by-character streaming
-      let sentText = '';
       const chars = text.split('');
       
       for (const char of chars) {
         sentText += char;
         
-        // Send message with the accumulated text
-        await ctx.reply(sentText, { parse_mode: 'Markdown' });
+        // Edit the message in place
+        await ctx.api.editMessageText(sentText, {
+          message_id: sentMsg.message_id,
+          chat_id: sentMsg.chat.id,
+          parse_mode: 'Markdown'
+        });
         
         // Random delay between min and max
         const delayMs = minDelay + Math.random() * (maxDelay - minDelay);
         await new Promise(resolve => setTimeout(resolve, delayMs));
       }
     } else {
-      // Word-by-word streaming (default)
+      // Word-by-word streaming
       const words = text.split(' ');
-      let sentText = '';
       
       for (let i = 0; i < words.length; i++) {
         sentText += (i > 0 ? ' ' : '') + words[i];
         
-        // Send accumulated text
-        await ctx.reply(sentText, { parse_mode: 'Markdown' });
+        // Edit the message in place
+        await ctx.api.editMessageText(sentText, {
+          message_id: sentMsg.message_id,
+          chat_id: sentMsg.chat.id,
+          parse_mode: 'Markdown'
+        });
         
         // Variable delay based on word length
-        const wordDelay = Math.max(minDelay, Math.min(maxDelay, delay + words[i].length * 10));
+        const wordDelay = Math.max(minDelay, Math.min(maxDelay, delay + words[i].length * 8));
         await new Promise(resolve => setTimeout(resolve, wordDelay));
       }
     }