restore: bring back f8a1310 (security review) state

Restores all files to the f8a1310 security-review snapshot as requested,
plus the 2 boot-critical fixes from a24c8a2 (config/session.php env()
instead of app()->environment(), and removal of the duplicate $activeTab
in ProjectMap.php) so the application actually boots.

Forward commit, no history rewrite. The 7d854ff state remains in history.

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

app/Livewire/ProjectEditTabs.php

@@ -4,6 +4,7 @@ namespace App\Livewire;
 
 use Livewire\Component;
 use App\Models\Project;
+use Illuminate\Support\Facades\Gate;
 
 class ProjectEditTabs extends Component
 {
@@ -12,6 +13,7 @@ class ProjectEditTabs extends Component
 
     public function mount(Project $project)
     {
+        Gate::authorize('edit projects', $project);
         $this->project = $project;
     }
 
@@ -29,8 +31,9 @@ class ProjectEditTabs extends Component
 
     public function updateProject()
     {
+        Gate::authorize('edit projects', $this->project);
         $this->project->save();
-        
+
         session()->flash('message', __('Project updated successfully.'));
         $this->dispatch('project-updated');
     }