fix: Remove wire:navigate to fix MIME type error

Livewire 3's SPA navigation (wire:navigate) was causing the browser
to register document URLs as JavaScript sources, resulting in:
'Refused to execute script... MIME type text/html is not executable'

Removed wire:navigate from:
- partials/tree-item.blade.php (sidebar links)
- livewire/document-viewer.blade.php (backlinks)
- livewire/quick-switcher.blade.php (search results)

Pages will now do full page loads instead of SPA navigation.

src/resources/views/livewire/document-viewer.blade.php

@@ -53,7 +53,6 @@ class="inline-flex items-center px-4 py-2 bg-indigo-600 text-white text-sm font-
                     <a
                         href="{{ route('documents.show', $backlink) }}"
                         class="block p-4 bg-gray-50 rounded-lg hover:bg-gray-100 transition"
-                        wire:navigate
                     >
                         <div class="flex items-center">
                             <svg class="w-4 h-4 mr-2 text-gray-400" fill="none" stroke="currentColor" viewBox="0 0 24 24">