Upgrade filament from 3 to 4

app/Filament/Resources/OutgoingLetters/OutgoingLetters/OutgoingLetterResource.php

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+<?php
+
+namespace App\Filament\Resources;
+
+use App\Filament\Resources\OutgoingLetterResource\Pages;
+use App\Modules\OutgoingLetter\Models\OutgoingLetter;
+use Filament\Forms\Components\TextInput;
+use Filament\Forms\Form;
+use Filament\Resources\Resource;
+use Filament\Tables;
+use Filament\Tables\Columns\TextColumn;
+use Filament\Forms\Components\FileUpload;
+
+use Filament\Tables\Table;
+use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Support\Carbon;
+
+class OutgoingLetterResource extends Resource
+{
+    protected static ?string $model = OutgoingLetter::class;
+
+    protected static ?string $navigationIcon = 'heroicon-o-document-arrow-up';
+
+    public static function form(Form $form): Form
+    {
+        return $form
+            ->schema([
+                TextInput::make('number')
+                    ->integer()
+                    ->required()
+                    ->default(fn () => getLatestNumber() + 1),
+
+                TextInput::make('name')
+                    ->required(),
+
+                FileUpload::make('main_file'),
+            ]);
+    }
+
+    public static function table(Table $table): Table
+    {
+        return $table
+            ->defaultSort('number', 'desc')
+            ->columns([
+                TextColumn::make('number')
+                    ->searchable()
+                    ->sortable(query: fn (Builder $query, string $direction) => $query->orderByRaw("CAST(number AS UNSIGNED) $direction")),
+
+                TextColumn::make('name')
+                    ->searchable()
+                    ->sortable(),
+
+                TextColumn::make('created_at')
+                    ->dateTime()
+                    ->sortable()
+                    ->sinceTooltip()
+                    ->formatStateUsing(fn (?Carbon $state) => $state?->format('H:i, d.m.Y')),
+            ])
+            ->filters([
+                //
+            ])
+            ->actions([
+                Tables\Actions\EditAction::make(),
+            ])
+            ->bulkActions([
+                Tables\Actions\BulkActionGroup::make([
+                    Tables\Actions\DeleteBulkAction::make(),
+                ]),
+            ]);
+    }
+
+    public static function getRelations(): array
+    {
+        return [
+            //
+        ];
+    }
+
+    public static function getPages(): array
+    {
+        return [
+            'index' => Pages\ListOutgoingLetters::route('/'),
+            'create' => Pages\CreateOutgoingLetter::route('/create'),
+            'edit' => Pages\EditOutgoingLetter::route('/{record}/edit'),
+        ];
+    }
+}

app/Filament/Resources/OutgoingLetters/Pages/CreateOutgoingLetter.php

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+<?php
+
+namespace App\Filament\Resources\OutgoingLetterResource\Pages;
+
+use App\Filament\Resources\OutgoingLetterResource;
+use Filament\Resources\Pages\CreateRecord;
+
+class CreateOutgoingLetter extends CreateRecord
+{
+    protected static string $resource = OutgoingLetterResource::class;
+}

app/Filament/Resources/OutgoingLetters/Pages/EditOutgoingLetter.php

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+<?php
+
+namespace App\Filament\Resources\OutgoingLetterResource\Pages;
+
+use App\Filament\Resources\OutgoingLetterResource;
+use Filament\Actions;
+use Filament\Resources\Pages\EditRecord;
+
+class EditOutgoingLetter extends EditRecord
+{
+    protected static string $resource = OutgoingLetterResource::class;
+
+    protected function getHeaderActions(): array
+    {
+        return [
+            Actions\DeleteAction::make(),
+        ];
+    }
+}

app/Filament/Resources/OutgoingLetters/Pages/ListOutgoingLetters.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace App\Filament\Resources\OutgoingLetterResource\Pages;
+
+use App\Filament\Resources\OutgoingLetterResource;
+use Filament\Actions;
+use Filament\Resources\Pages\ListRecords;
+
+class ListOutgoingLetters extends ListRecords
+{
+    protected static string $resource = OutgoingLetterResource::class;
+
+    protected function getHeaderActions(): array
+    {
+        return [
+            Actions\CreateAction::make(),
+        ];
+    }
+}