style: manual UI tweaks (users/companies headers, wider layout, user-view, projects index)

User's manual changes: header slots with New-user/New-company actions, wider
max-w-7xl containers on /admin/users and /companies, plus tweaks to
user-view and projects index views. All views compile.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

resources/views/livewire/user-form.blade.php

@@ -11,7 +11,7 @@
 </x-slot>
 
 <div class="py-8">
-<div class="max-w-3xl mx-auto sm:px-6 lg:px-8">
+<div class="max-w-7xl mx-auto sm:px-6 lg:px-8">
 
     @if(session('notify'))
         <div class="alert alert-success mb-4">