feat: add admin env badge, quick post button, and harden plugin enable

Show local/prod in the Filament topbar, jump to create post in one click, tighten sidebar spacing, and stop Hello World from 500ing when its tables are missing.

Co-authored-by: Cursor <cursoragent@cursor.com>

resources/views/filament/hooks/topbar-tools.blade.php

@@ -0,0 +1,22 @@
+@php
+    $environmentName = \App\Filament\Support\AdminEnvironment::name();
+    $environmentColor = \App\Filament\Support\AdminEnvironment::color();
+    $createPostUrl = \App\Filament\Resources\Posts\PostResource::getUrl('create');
+@endphp
+
+<div class="ll-topbar-tools">
+    <x-filament::badge :color="$environmentColor" size="sm" class="ll-env-badge">
+        {{ $environmentName }}
+    </x-filament::badge>
+
+    <x-filament::button
+        tag="a"
+        :href="$createPostUrl"
+        size="sm"
+        color="primary"
+        icon="heroicon-o-pencil-square"
+        wire:navigate
+    >
+        写文章
+    </x-filament::button>
+</div>