fix(MAT-13): Add DNS fallback via web search for browse_url

When browse_url fails with DNS resolution error (common with STT-misrecognized
domain names like "klicksports" instead of "clicksports"), automatically try a
web search to find the correct domain and retry. Applied to both text and voice bot.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

bot.py

@@ -2099,9 +2099,24 @@ class Bot:
         if tool_name == "web_search":
             return await self._brave_search(args.get("query", ""), args.get("count", 5))
 
-        # Browse URL — no auth needed
+        # Browse URL — no auth needed, with DNS fallback via web search
         if tool_name == "browse_url":
-            return await self._fetch_webpage(args.get("url", ""))
+            url = args.get("url", "")
+            result = await self._fetch_webpage(url)
+            if "Name or service not known" in result or "Failed to fetch" in result:
+                from urllib.parse import urlparse
+                domain = urlparse(url).netloc or url
+                logger.info("Browse DNS fail for %s — trying web search", domain)
+                search_result = await self._brave_search(f"{domain} website", count=3)
+                if search_result and "No results" not in search_result:
+                    url_match = re.search(r'https?://[^\s\)]+', search_result)
+                    if url_match:
+                        corrected_url = url_match.group(0).rstrip('.,;')
+                        retry = await self._fetch_webpage(corrected_url)
+                        if "Failed to fetch" not in retry:
+                            return f"[Original URL {url} unreachable. Found correct site at {corrected_url}]\n\n{retry}"
+                return f"Could not reach {url}. The domain may be misspelled — ask the user to clarify."
+            return result
 
         # Atlassian tools — need per-user token
         token = await self.atlassian.get_token(sender) if sender else None