Fix Tiptap editor visual formatting and improve badge contrast

Tiptap Editor Improvements:
- Active toolbar buttons now use primary background (black) instead of accent (gray) for better visibility
- Added visual formatting for headings (h1: 2xl bold, h2: xl bold with proper spacing)
- Added visual styling for blockquotes (left border, italic, muted foreground)

Badge Contrast Fixes:
- Product detail page badges now use primary background (black with white text) instead of secondary/accent (gray)
- Fixed product type badge and "Anda memiliki akses" badge
- Fixed "Rekaman segera tersedia" badge

API Query Fix:
- Fixed consulting_slots 400 error by removing unsupported nested relationship filter
- Changed to filter in JavaScript after fetching data from Supabase

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/pages/ProductDetail.tsx

@@ -267,7 +267,7 @@ export default function ProductDetail() {
               Gabung Webinar
             </a>
           </Button>
-        ) : <Badge className="bg-secondary">Rekaman segera tersedia</Badge>;
+        ) : <Badge className="bg-primary text-primary-foreground">Rekaman segera tersedia</Badge>;
       case 'bootcamp':
         return (
           <Button onClick={() => navigate(`/bootcamp/${product.slug}`)} size="lg" className="shadow-sm">
@@ -346,8 +346,8 @@ export default function ProductDetail() {
             <div>
               <h1 className="text-4xl font-bold mb-2">{product.title}</h1>
               <div className="flex items-center gap-2">
-                <Badge className="bg-secondary capitalize">{product.type}</Badge>
-                {hasAccess && <Badge className="bg-accent">Anda memiliki akses</Badge>}
+                <Badge className="bg-primary text-primary-foreground capitalize">{product.type}</Badge>
+                {hasAccess && <Badge className="bg-primary text-primary-foreground">Anda memiliki akses</Badge>}
               </div>
             </div>
             <div className="text-right">