feat(profile): add username + preferred_locale; wire to Inertia + middleware

- DB: users.username (unique), users.preferred_locale (default from app.locale)
- Backend: validation, model fillable; share supportedLocales; SetLocaleFromUser
- Frontend: profile page fields + types
- Filament: SuperAdmin profile page with username/language

feat(admin-nav): move Tasks to Bibliothek and add menu labels

fix(tasks-table): show localized title/emotion/event type; add translated headers

feat(l10n): add missing table headers for emotions and event types; normalize en/de files

refactor: tidy translations for tasks/emotions/event types

app/Filament/Pages/SuperAdminProfile.php

@@ -0,0 +1,59 @@
+<?php
+
+namespace App\Filament\Pages;
+
+use Filament\Auth\Pages\EditProfile as BaseEditProfile;
+use Filament\Forms\Components\Select;
+use Filament\Forms\Components\TextInput;
+use Filament\Schemas\Components\Component;
+use Filament\Schemas\Schema;
+
+class SuperAdminProfile extends BaseEditProfile
+{
+    protected function getUsernameFormComponent(): Component
+    {
+        return TextInput::make('username')
+            ->label(__('Username'))
+            ->maxLength(32)
+            ->unique(ignoreRecord: true);
+    }
+
+    protected function getPreferredLocaleFormComponent(): Component
+    {
+        $supported = collect(explode(',', (string) env('APP_SUPPORTED_LOCALES', 'de,en')))
+            ->map(fn ($l) => trim((string) $l))
+            ->filter()
+            ->unique()
+            ->values()
+            ->all();
+
+        if (empty($supported)) {
+            $supported = array_values(array_unique(array_filter([
+                config('app.locale'),
+                config('app.fallback_locale'),
+            ])));
+        }
+
+        $options = collect($supported)->mapWithKeys(fn ($l) => [$l => strtoupper($l)])->all();
+
+        return Select::make('preferred_locale')
+            ->label(__('Language'))
+            ->required()
+            ->options($options);
+    }
+
+    public function form(Schema $schema): Schema
+    {
+        return $schema
+            ->components([
+                $this->getNameFormComponent(),
+                $this->getEmailFormComponent(),
+                $this->getUsernameFormComponent(),
+                $this->getPreferredLocaleFormComponent(),
+                $this->getPasswordFormComponent(),
+                $this->getPasswordConfirmationFormComponent(),
+                $this->getCurrentPasswordFormComponent(),
+            ]);
+    }
+}
+