feat: add MediaGallery form field component

- Add comprehensive MediaGallery component for Filament forms
- Include bulk operations with toggleable bulk delete
- Support drag & drop file uploads and URL uploads
- Memory-efficient image processing to handle multiple uploads
- Responsive grid layout with cover image functionality
- Complete test coverage and documentation

Author: thapacodes4u

docs/MediaGallery.md

@@ -0,0 +1,174 @@
+# MediaGallery Form Field
+
+A powerful image gallery form field for Filament with drag & drop reordering, multiple upload options, and preview features.
+
+## Basic Usage
+
+```php
+use Eclipse\Common\Filament\Forms\Components\MediaGallery;
+
+MediaGallery::make('images')
+    ->collection('gallery')
+    ->required()
+```
+
+## Collection Configuration
+
+```php
+MediaGallery::make('images')
+    ->collection('product-gallery') // Media collection name
+    ->collection(fn () => 'dynamic-' . $this->category) // Dynamic collection
+```
+
+## Upload Options
+
+```php
+MediaGallery::make('images')
+    ->maxFiles(10) // Maximum number of files
+    ->maxFileSize(2048) // Max size in KB
+    ->acceptedFileTypes(['image/jpeg', 'image/png', 'image/webp'])
+    ->allowUploads() // Enable both upload methods
+    ->single() // Single file mode
+    ->multiple() // Multiple files (default)
+```
+
+## Preview & Layout
+
+```php
+MediaGallery::make('images')
+    ->columns(6) // Number of columns (default: 4)
+    ->thumbnailHeight(200) // Thumbnail height in pixels (default: 150)
+    ->preview() // Enable lightbox preview (disabled by default)
+    ->orderable() // Enable drag & drop reordering (disabled by default)
+```
+
+### Responsive Columns
+
+```php
+MediaGallery::make('images')
+    ->columns([
+        'default' => 2,
+        'sm' => 3,
+        'lg' => 4,
+        'xl' => 6
+    ])
+```
+
+## Methods Available
+
+### Layout Control
+- `columns(int|array)` - Set number of grid columns or responsive column configuration (default: 4)
+- `thumbnailHeight(int)` - Set thumbnail image height in pixels (default: 150)
+
+### Interactive Features
+- `preview()` - Enable lightbox modal for image preview (disabled by default)
+- `orderable()` - Enable drag & drop reordering (disabled by default)
+
+### Upload Configuration
+- `collection(string)` - Set media collection name
+- `maxFiles(int)` - Maximum number of uploadable files
+- `maxFileSize(int)` - Maximum file size in KB
+- `acceptedFileTypes(array)` - Allowed file MIME types
+- `allowFileUploads()` - Enable file upload button (disabled by default)
+- `allowUrlUploads()` - Enable URL upload button (disabled by default)
+- `allowUploads()` - Enable both file and URL upload buttons
+- `single()` - Single file mode
+- `multiple()` - Multiple file mode (default)
+
+## Actions Available
+
+The MediaGallery provides these built-in actions:
+
+- **Upload**: File upload with drag & drop interface
+- **URL Upload**: Add images from external URLs
+- **Edit**: Edit image details and metadata
+- **Delete**: Remove images with confirmation
+- **Set Cover**: Mark image as cover/featured
+- **Reorder**: Drag & drop reordering (when `orderable()` is enabled)
+
+## Examples
+
+### Basic Gallery (View Only)
+```php
+MediaGallery::make('images')
+    ->collection('products')
+```
+
+### Gallery with Uploads
+```php
+MediaGallery::make('images')
+    ->collection('gallery')
+    ->allowUploads() // Enable both upload methods
+    ->maxFiles(20)
+```
+
+### Gallery with Preview
+```php
+MediaGallery::make('images')
+    ->collection('gallery')
+    ->allowUploads()
+    ->preview() // Enables lightbox
+    ->columns(3)
+    ->thumbnailHeight(180)
+```
+
+### Orderable Gallery
+```php
+MediaGallery::make('images')
+    ->collection('portfolio')
+    ->allowUploads()
+    ->orderable() // Enables drag & drop
+    ->columns(5)
+    ->maxFiles(50)
+```
+
+### File Upload Only
+```php
+MediaGallery::make('images')
+    ->collection('secure-documents')
+    ->allowFileUploads() // Only file uploads
+    ->maxFiles(10)
+```
+
+### URL Upload Only
+```php
+MediaGallery::make('images')
+    ->collection('external-media')
+    ->allowUrlUploads() // Only URL uploads
+    ->columns(6)
+```
+
+### Complete Configuration
+```php
+MediaGallery::make('images')
+    ->collection('products')
+    ->allowUploads() // Enable both upload methods
+    ->maxFiles(20)
+    ->columns(4)
+    ->thumbnailHeight(180)
+    ->preview() // Enable lightbox
+    ->orderable() // Enable reordering
+    ->acceptedFileTypes(['image/jpeg', 'image/png'])
+```
+
+### Dynamic Configuration
+```php
+MediaGallery::make('images')
+    ->collection(fn () => $this->record?->category . '-images')
+    ->maxFiles(fn () => $this->record?->isPremium() ? 50 : 10)
+    ->columns(fn () => $this->getColumnCount())
+```
+
+## Default Behaviors
+
+- **Upload Buttons**: Disabled by default (use `->allowUploads()`, `->allowFileUploads()`, or `->allowUrlUploads()`)
+- **Lightbox**: Disabled by default (use `->preview()` to enable)
+- **Drag & Drop**: Disabled by default (use `->orderable()` to enable)
+- **Grid Columns**: 4 columns by default
+- **File Types**: Images only (jpeg, png, gif, webp)
+
+## Requirements
+
+- Spatie Media Library package
+- Model must implement `HasMedia` interface
+- Images are stored in configured media collections