Currency dropdown + logo on login/topbar via brandLogo closure

- Onboarding + Settings: Forms\Components\Select for currency
  (MDL/EUR/USD/RON/UAH/RUB) instead of TextInput
- TenantPanel: brandName/brandLogo/favicon as closures resolving from
  tenant. Logo now visible on login page, topbar, sidebar (Filament
  v5 brandLogo handles all 3 spots automatically)
- Favicon falls back to logo if favicon not separately uploaded
- Removed manual SIDEBAR_LOGO_BEFORE injection (replaced by brandLogo)
- Removed manual <link rel=icon> in HEAD_END (replaced by ->favicon)

app/Filament/Tenant/Pages/Onboarding.php

@@ -64,8 +64,19 @@ class Onboarding extends Page
                             ->label('Oraș')->maxLength(60),
                         Forms\Components\TextInput::make('phone')
                             ->label('Telefon principal')->tel()->maxLength(40),
-                        Forms\Components\TextInput::make('currency')
-                            ->label('Monedă')->required()->maxLength(8),
+                        Forms\Components\Select::make('currency')
+                            ->label('Monedă')
+                            ->options([
+                                'MDL' => 'MDL — Leu moldovenesc',
+                                'EUR' => 'EUR — Euro',
+                                'USD' => 'USD — US Dollar',
+                                'RON' => 'RON — Leu românesc',
+                                'UAH' => 'UAH — Hryvnia',
+                                'RUB' => 'RUB — Rublă',
+                            ])
+                            ->default('MDL')
+                            ->required()
+                            ->searchable(),
                     ]),
                 Schemas\Components\Section::make('Pas 2 — Brand & limbă')
                     ->visible(fn () => $this->step === 2)