fix(faq): toggle worked server-side but click did nothing — nested forms

Filament pages wrap their content in an outer <form>. My inline
<form method="POST"> for the hint toggle + reset was nested inside
that outer form — invalid HTML, so browsers dropped my submit and
either did nothing or ran the outer Livewire form's handler.

Replaced both forms with plain <button type="button"> + onclick
fetch() POST + window.location.reload(). Controller now also returns
JSON when Accept: application/json (fetch sends that) instead of a
back() redirect.

The server-side flip was always correct — verified via a Feature
test that posts to /app/hints/toggle and asserts the user column
flipped from true → false.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

app/Http/Controllers/HintController.php

@@ -26,6 +26,9 @@ class HintController extends Controller
         abort_unless($user, 401);
         $user->hints_enabled = ! $user->hints_enabled;
         $user->save();
+        if ($request->expectsJson()) {
+            return response()->json(['ok' => true, 'hints_enabled' => (bool) $user->hints_enabled]);
+        }
         return back();
     }
 
@@ -37,6 +40,9 @@ class HintController extends Controller
         $user->dismissed_hints = [];
         $user->hints_enabled = true;
         $user->save();
+        if ($request->expectsJson()) {
+            return response()->json(['ok' => true]);
+        }
         return back();
     }
 }