fix: Improve text line separation in builder response

- Update regex to handle both periods and colons as sentence separators
- Properly separate sentences followed by uppercase letters with double newlines
- Fixes issue where OpenCode response text wasn't properly line-separated

chat/public/builder.js

@@ -2016,7 +2016,7 @@ window.renderMessages = renderMessages;
 function renderContentWithTodos(text) {
   const wrapper = document.createElement('div');
   if (!text) return document.createTextNode('');
-  const processedText = String(text).replace(/\.\s+/g, '.\n');
+  const processedText = String(text).replace(/([.:])\s+(?=[A-Z])/g, '$1\n\n');
   const lines = processedText.split(/\r?\n/);
   let currentList = null;
   let inCodeBlock = false;