Tag blog posts and sign them with a member

Tags are named in every language and made from the page form; the byline is
the member who signs a post on the site. The public API sends both, filters
posts by tag and lists the tags in use.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

app/Filament/Resources/Pages/Schemas/PageForm.php

@@ -9,6 +9,7 @@ use App\Filament\Resources\Pages\PageResource;
 use App\Filament\Support\TranslatableTabs;
 use App\Filament\Support\TranslatedOptionLabel;
 use App\Models\Page;
+use App\Models\Tag;
 use App\Rules\UniqueTranslatedSlug;
 use App\Support\DuplicateTitles;
 use Filament\Forms\Components\DateTimePicker;
@@ -126,6 +127,39 @@ class PageForm
                         ->searchable()
                         ->preload(),
 
+                    // What the post is about, for the blog to be read by
+                    // subject. A missing one is made from here.
+                    Select::make('tags')
+                        ->label(__('panel.tags.plural'))
+                        ->relationship('tags', 'name->'.config('locales.default'))
+                        ->getOptionLabelFromRecordUsing(TranslatedOptionLabel::using('name'))
+                        ->multiple()
+                        ->searchable()
+                        ->preload()
+                        ->createOptionForm([
+                            TextInput::make('name')
+                                ->label(__('panel.tags.fields.name'))
+                                ->required()
+                                ->maxLength(80),
+                        ])
+                        ->createOptionUsing(function (array $data): int {
+                            $locale = (string) config('locales.default');
+
+                            return Tag::query()->create([
+                                'name' => [$locale => $data['name']],
+                                'slug' => [$locale => Str::slug($data['name'])],
+                            ])->getKey();
+                        })
+                        ->createOptionAction(fn ($action) => $action->authorize('create', Tag::class)),
+
+                    // Who signs it on the site, with a link to their profile.
+                    Select::make('byline_member_id')
+                        ->label(__('panel.pages.fields.byline'))
+                        ->helperText(__('panel.pages.fields.byline_hint'))
+                        ->relationship('byline', 'name')
+                        ->searchable()
+                        ->preload(),
+
                     Select::make('author_id')
                         ->label(__('panel.pages.fields.author'))
                         ->relationship('author', 'name')