Add an editorial calendar to the panel

A month of publications, scheduled dates, content coming off the site, and
calls opening and closing, each linked to its form.

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

app/Filament/Pages/EditorialCalendar.php

@@ -0,0 +1,123 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Filament\Pages;
+
+use App\Support\EditorialCalendar as Calendar;
+use BackedEnum;
+use Carbon\CarbonImmutable;
+use Filament\Pages\Page as FilamentPage;
+use Filament\Support\Icons\Heroicon;
+use Illuminate\Contracts\Support\Htmlable;
+use Illuminate\Support\Facades\Auth;
+use Livewire\Attributes\Url;
+use UnitEnum;
+
+/**
+ * A month at a glance: what goes live, what comes off, which calls open and
+ * close. The dates were always there, one form at a time; this is them side
+ * by side, which is where a clash or an empty fortnight shows.
+ */
+class EditorialCalendar extends FilamentPage
+{
+    protected string $view = 'filament.pages.editorial-calendar';
+
+    protected static string|BackedEnum|null $navigationIcon = Heroicon::OutlinedCalendarDays;
+
+    protected static ?int $navigationSort = 5;
+
+    /**
+     * `2026-10`. In the address, so a month can be linked to.
+     */
+    #[Url]
+    public string $month = '';
+
+    public function mount(): void
+    {
+        if (! preg_match('/^\d{4}-\d{2}$/', $this->month)) {
+            $this->month = now()->format('Y-m');
+        }
+    }
+
+    public static function canAccess(): bool
+    {
+        return Auth::user()?->can('panel.access') ?? false;
+    }
+
+    public static function getNavigationGroup(): string|UnitEnum|null
+    {
+        return __('panel.groups.content');
+    }
+
+    public static function getNavigationLabel(): string
+    {
+        return __('panel.calendar.title');
+    }
+
+    public function getTitle(): string|Htmlable
+    {
+        return __('panel.calendar.title');
+    }
+
+    public function previous(): void
+    {
+        $this->month = $this->first()->subMonth()->format('Y-m');
+    }
+
+    public function next(): void
+    {
+        $this->month = $this->first()->addMonth()->format('Y-m');
+    }
+
+    public function today(): void
+    {
+        $this->month = now()->format('Y-m');
+    }
+
+    public function first(): CarbonImmutable
+    {
+        return CarbonImmutable::createFromFormat('Y-m-d', $this->month.'-01')->startOfDay();
+    }
+
+    public function label(): string
+    {
+        return ucfirst($this->first()->locale(app()->getLocale())->isoFormat('MMMM YYYY'));
+    }
+
+    /**
+     * Whole weeks, Monday first, covering the month.
+     *
+     * @return array<int, array<int, array{date: CarbonImmutable, inMonth: bool, isToday: bool, events: array<int, array<string, mixed>>}>>
+     */
+    public function weeks(): array
+    {
+        $start = $this->first()->startOfWeek(CarbonImmutable::MONDAY);
+        $end = $this->first()->endOfMonth()->endOfWeek(CarbonImmutable::SUNDAY);
+
+        $events = Calendar::between($start, $end, Auth::user())->groupBy('date');
+
+        $weeks = [];
+
+        for ($day = $start; $day->lte($end); $day = $day->addDay()) {
+            $weeks[intdiv((int) $start->diffInDays($day), 7)][] = [
+                'date' => $day,
+                'inMonth' => $day->month === $this->first()->month,
+                'isToday' => $day->isToday(),
+                'events' => ($events[$day->toDateString()] ?? collect())->all(),
+            ];
+        }
+
+        return $weeks;
+    }
+
+    /**
+     * @return array<int, string>
+     */
+    public function weekdays(): array
+    {
+        $monday = CarbonImmutable::now()->locale(app()->getLocale())->startOfWeek(CarbonImmutable::MONDAY);
+
+        return array_map(fn (int $i) => $monday->addDays($i)->isoFormat('ddd'), range(0, 6));
+    }
+}