feat: orientation model, password confirm, frontend build

- Collapse orientation to landscape/portrait (ribbon left = portrait standard)
- Add OrientationPicker component and wire settings sheet in HomeView
- Add password confirmation field to registration form (RepeatedType)
- Build frontend SPA to public/build/

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/Enum/Orientation.php

@@ -6,6 +6,13 @@ namespace App\Enum;
 
 enum Orientation: string
 {
+    /** Ribbon at bottom; nail/hanging point at top. */
     case Landscape = 'landscape';
+    /** Ribbon on left; nail/hanging point on right. */
     case Portrait  = 'portrait';
+
+    public function isPortrait(): bool
+    {
+        return $this === self::Portrait;
+    }
 }