Fix builder plan message display and error handling

- Strip double stars (**) and double hashtags (##) from plan message displayContent in both client and server
- Fix server restart error replacing plan message by skipping error state for plan messages
- Fix rate limiting regex pattern to use proper global flag

chat/public/builder.js

@@ -1896,6 +1896,17 @@ function hideLoadingIndicator() {
 window.hideLoadingIndicator = hideLoadingIndicator;
 
 function renderMessages(session) {
+  // Helper function to strip markdown formatting from user input
+  function stripMarkdownFormatting(text) {
+    if (!text || typeof text !== 'string') return text;
+    let cleaned = text;
+    cleaned = cleaned.replace(/\*\*([^*]+)\*\*/g, '$1');
+    cleaned = cleaned.replace(/\*\*/g, '');
+    cleaned = cleaned.replace(/^##\s+/gm, '');
+    cleaned = cleaned.replace(/##/g, '');
+    return cleaned;
+  }
+
   // Don't clear the loading indicator if it exists
   const loadingIndicator = document.getElementById('loading-indicator');
   // Store reference before clearing, and remove animation class to prevent bounce on re-render
@@ -1960,7 +1971,8 @@ function renderMessages(session) {
     `;
     const userBody = document.createElement('div');
     userBody.className = 'body';
-    userBody.appendChild(renderContentWithTodos(msg.displayContent || msg.content || ''));
+    const contentToRender = isPlanMessage ? stripMarkdownFormatting(msg.displayContent || msg.content || '') : (msg.displayContent || msg.content || '');
+    userBody.appendChild(renderContentWithTodos(contentToRender));
     userCard.appendChild(userMeta);
     userCard.appendChild(userBody);
     // Attachments
@@ -3190,7 +3202,18 @@ function streamMessage(sessionId, messageId) {
     const message = session?.messages.find(m => m.id === messageId);
     
     if (message && message.status === 'queued') {
-      // Server restart was signaled, poll for reconnection
+      // Check if this is a plan message (don't set error for plan messages, just log)
+      const isPlanMessage = message.phase === 'plan' || message.cli !== 'opencode';
+      
+      if (isPlanMessage) {
+        // For plan messages, just log and don't modify the message
+        console.log('[SSE] Plan message encountered server restart, preserving original content', { messageId, sessionId });
+        hideLoadingIndicator();
+        setStatus('Service temporarily unavailable. Please try again in a moment.');
+        return;
+      }
+      
+      // For OpenCode messages, poll for reconnection
       console.log('Server restart detected, attempting reconnection...', { messageId, sessionId });
       let reconnectAttempts = 0;
       const maxReconnectAttempts = 30; // 30 seconds max