Add toggleable wire:navigate SPA navigation with prefetching

Implement instance-wide SPA navigation toggle that enables smooth page transitions with prefetching on hover. Excludes terminal links which require full page lifecycle for WebSocket connections. Adds defensive checks to global-search component for SPA navigation compatibility.

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Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

resources/views/livewire/shared-variables/environment/index.blade.php

@@ -15,7 +15,7 @@
                     href="{{ route('shared-variables.environment.show', [
                         'project_uuid' => $project->uuid,
                         'environment_uuid' => $environment->uuid,
-                    ]) }}">
+                    ]) }}" {{ wireNavigate() }}>
                     <div class="flex flex-col justify-center flex-1 mx-6 ">
                         <div class="box-title"> {{ $environment->name }}</div>
                         <div class="box-description">