0.37.6: remember the "Show hidden" toggle across reloads

Uploaded dotfiles (.env) were persisting fine, but "Show hidden" is
component state that reset to off on every reload — so after refreshing,
hidden files disappeared from view and looked lost. Persist the toggle in
localStorage (sp.files.showHidden) so it survives reloads; combined with
0.37.5's auto-reveal, an uploaded .env now stays visible.

Frontend-only; all 3 images rebuilt+pushed 0.37.6.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/version.py

@@ -1,3 +1,3 @@
 """Single source of truth for the StackPilot release version."""
 
-APP_VERSION = "0.37.5"
+APP_VERSION = "0.37.6"

frontend/package.json

@@ -1,7 +1,7 @@
 {
   "name": "stackpilot-frontend",
   "private": true,
-  "version": "0.37.5",
+  "version": "0.37.6",
   "type": "module",
   "scripts": {
     "dev": "vite",

frontend/src/pages/Files.tsx

@@ -76,7 +76,14 @@ export function Files() {
   const qc = useQueryClient();
   const [host, setHost] = useState<number | undefined>(undefined); // undefined = local
   const [path, setPath] = useState("/");
-  const [showHidden, setShowHidden] = useState(false);
+  // Persist "Show hidden" across reloads — otherwise an uploaded dotfile (.env)
+  // becomes invisible again after a refresh and looks like it was lost.
+  const [showHidden, setShowHidden] = useState(
+    () => localStorage.getItem("sp.files.showHidden") === "1",
+  );
+  useEffect(() => {
+    localStorage.setItem("sp.files.showHidden", showHidden ? "1" : "0");
+  }, [showHidden]);
   const [editing, setEditing] = useState<HostPathEntry | null>(null);
   const [renaming, setRenaming] = useState<HostPathEntry | null>(null);
   const [deleting, setDeleting] = useState<HostPathEntry | null>(null);