chore: last frontend style nits — http case in common.js, setTimeout wrappers

- common.js fetchStateFile: 'HTTP' -> 'http' — last uppercase instance
  in the frontend (tabs.js, app.js, logs.js already fixed in prior PRs)
- tabs.js: two redundant arrow wrappers in setTimeout dropped —
  setTimeout(() => f(), N) -> setTimeout(f, N) where f takes no args

frontend/packages/dashboard/src/common.js

@@ -387,7 +387,7 @@ export const Panel = (() => {
 async function fetchStateFile(path) {
   const resp = await fetch('/api/state-file?path=' + encodeURIComponent(path));
   const text = await resp.text();
-  if (!resp.ok) throw new Error(text || ('HTTP ' + resp.status));
+  if (!resp.ok) throw new Error(text || ('http ' + resp.status));
   return text;
 }
 // A 2-tab file preview: a "rendered" tab (default) + a raw-text tab.