llm: fix custom OpenAI implementation (backwards compatibility) and improve admin panel LLM test UI

Author: haraldschilly

src/.claude/settings.local.json

@@ -12,7 +12,8 @@
       "WebFetch(domain:cocalc.com)",
       "WebFetch(domain:doc.cocalc.com)",
       "Bash(npm show:*)",
-      "Bash(prettier -w:*)"
+      "Bash(prettier -w:*)",
+      "Bash(npx tsc:*)"
     ],
     "deny": []
   }

src/packages/frontend/admin/_style.sass

@@ -13,3 +13,6 @@
     td:first-child
       font-family: monospace
       font-weight: bold
+
+.admin-llm-test-running-row
+  background-color: #f0f0f0 !important