Add a statistics page to the panel

The most read, reads per language with a daily chart, and published content
nobody opened, each compared with the period before.

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

app/Filament/Pages/Statistics.php

@@ -0,0 +1,84 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Filament\Pages;
+
+use App\Support\ViewStats;
+use BackedEnum;
+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;
+
+/**
+ * What people read: the most read, how each language is doing, and what is
+ * on the site that nobody opened. Counts only — what the frontend reports is
+ * a daily total per record and language, with nothing about the person.
+ */
+class Statistics extends FilamentPage
+{
+    public const PERIODS = [7, 30, 90];
+
+    protected string $view = 'filament.pages.statistics';
+
+    protected static string|BackedEnum|null $navigationIcon = Heroicon::OutlinedChartBar;
+
+    protected static ?int $navigationSort = 6;
+
+    #[Url]
+    public int $days = 30;
+
+    public function mount(): void
+    {
+        if (! in_array($this->days, self::PERIODS, true)) {
+            $this->days = 30;
+        }
+    }
+
+    public function updatedDays(): void
+    {
+        $this->mount();
+    }
+
+    public static function canAccess(): bool
+    {
+        return Auth::user()?->can('panel.access') ?? false;
+    }
+
+    public static function getNavigationGroup(): string|UnitEnum|null
+    {
+        return __('panel.groups.content');
+    }
+
+    public static function getNavigationLabel(): string
+    {
+        return __('panel.statistics.title');
+    }
+
+    public function getTitle(): string|Htmlable
+    {
+        return __('panel.statistics.title');
+    }
+
+    public function stats(): ViewStats
+    {
+        return new ViewStats($this->days);
+    }
+
+    /**
+     * "+52 %", "−10 %", or "new" when there was nothing to compare with.
+     */
+    public function change(int $now, int $before): string
+    {
+        if ($before === 0) {
+            return $now > 0 ? __('panel.statistics.new') : '—';
+        }
+
+        $percent = (int) round(($now - $before) * 100 / $before);
+
+        return ($percent > 0 ? '+' : ($percent < 0 ? '−' : '')).abs($percent).' %';
+    }
+}