feat: add Navigation plugin by Shuxx

- Config-driven navigation for Filament 4
- 24 separator styles (lines, dots, shapes, symbols, etc.)
- Support for links, groups, and separators
- Order preservation and external link support
- Auto-disable hover on separators

Author: shuxx

content/authors/shuxx.md

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+---
+name: Shuxx
+slug: shuxx
+github_url: https://github.com/shuxx
+---
+
+Full-stack developer passionate about creating clean, maintainable solutions for Laravel and Filament applications.

content/plugins/shuxx-navigation.md

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+---
+name: Navigation
+slug: shuxx-navigation
+author_slug: shuxx
+categories: [panel-builder, developer-tool]
+description: Configure Filament navigation via a simple PHP config file with 24 separator styles, groups, and links - no manual navigation building required.
+docs_url: https://github.com/shuxx/filament-navigation/blob/main/README.md
+github_repository: shuxx/filament-navigation
+has_dark_theme: true
+has_translations: false
+versions: [4]
+publish_date: 2025-11-11
+---
+
+Configure your Filament navigation structure via a clean PHP configuration file instead of manually building navigation in code.
+
+## Features
+
+- **Config-Driven Navigation** - Define entire navigation in `config/filament-navigation.php`
+- **Three Navigation Types** - Links, collapsible groups, and visual separators
+- **24 Separator Styles** - From classic lines to hearts and stars
+- **Order Preservation** - Array order equals display order in sidebar
+- **External Link Support** - Opens links in new tab with `external => true`
+- **Full Icon Support** - Complete Heroicon integration
+- **Auto-Hover Disable** - Separators don't react to mouse hover (customizable)
+
+## Quick Example
+
+```php
+'items' => [
+    ['type' => 'link', 'label' => 'Dashboard', 'url' => '/admin', 'icon' => 'heroicon-o-home'],
+    ['type' => 'separator', 'style' => 'stars'],
+    [
+        'type' => 'group',
+        'label' => 'Users',
+        'icon' => 'heroicon-o-user-group',
+        'collapsible' => true,
+        'items' => [
+            ['type' => 'link', 'label' => 'All Users', 'url' => '/admin/users'],
+            ['type' => 'link', 'label' => 'Roles', 'url' => '/admin/roles'],
+        ],
+    ],
+]
+```
+
+Perfect for applications where navigation needs to be easily manageable, version-controlled, and consistent across environments.
+
+See the [comprehensive examples](https://github.com/shuxx/filament-navigation/blob/main/EXAMPLES.md) for Blog, E-commerce, SaaS, CRM, and Project Management use cases.