smart truncation, iframe preservation, streamlit filter

- simphtml: truncate_biggest replaces naive string cut, targets fattest content block via 70% drill-down
- simphtml: iframe children preserved through div proxy (bypass BS4 limitation)
- background/content.js: filter streamlit tabs and skip content script injection
- ga.py: file_content tag regex allows attributes; maxchars 38k->35k

assets/tmwd_cdp_bridge/content.js

@@ -1,3 +1,4 @@
+;(function(){ if (/streamlit/i.test(document.title)) return;
 
 // Remove meta CSP tags
 document.querySelectorAll('meta[http-equiv="Content-Security-Policy"]').forEach(e => e.remove());
@@ -42,4 +43,5 @@ async function handle(el) {
   } catch (e) {
     el.textContent = JSON.stringify({ ok: false, error: e.message });
   }
-}
+}
+})();