Adopt Laravel's Image facade for media processing, upgrade Intervention to v4

Laravel 13's Image facade wraps Intervention Image v4 internally, so
switching our upload width probe and resize job/command to it required
bumping intervention/image ^3 -> ^4 (and its intervention/gif ^5
dependency). Removes our own ImageManager container binding and
config/image.php in favour of Laravel's built-in driver resolution.

Also fixes a latent filename mismatch in ProcessMediaJobTest that Pint's
stricter typing on the new Image API turned into a hard TypeError, and
tidies config/flare.php to use imported class names instead of FQCNs.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018Sorsgn85nw7uQyRMNvzyD

config/flare.php

@@ -1,5 +1,9 @@
 <?php
 
+use Spatie\FlareClient\Sampling\RateSampler;
+use Spatie\LaravelFlare\FlareConfig;
+use Spatie\LaravelFlare\Senders\LaravelHttpSender;
+
 return [
     /*
     |
@@ -25,7 +29,7 @@ return [
     |
     */
 
-    'collects' => \Spatie\LaravelFlare\FlareConfig::defaultCollects(
+    'collects' => FlareConfig::defaultCollects(
         ignore: [],
         extra: []
     ),
@@ -74,7 +78,7 @@ return [
     */
 
     'sender' => [
-        'class' => \Spatie\LaravelFlare\Senders\LaravelHttpSender::class,
+        'class' => LaravelHttpSender::class,
         'config' => [
             'timeout' => 10,
         ],
@@ -165,7 +169,7 @@ return [
     */
 
     'sampler' => [
-        'class' => \Spatie\FlareClient\Sampling\RateSampler::class,
+        'class' => RateSampler::class,
         'config' => [
             'rate' => env('FLARE_SAMPLER_RATE', 0.1),
         ],

config/image.php

@@ -1,22 +0,0 @@
-<?php
-
-use Intervention\Image\Drivers\Gd\Driver;
-
-return [
-
-    /*
-    |--------------------------------------------------------------------------
-    | Image Driver
-    |--------------------------------------------------------------------------
-    |
-    | Intervention Image supports "GD Library" and "Imagick" to process images
-    | internally. You may choose one of them according to your PHP
-    | configuration. By default PHP's "GD Library" implementation is used.
-    |
-    | Supported: "gd", "imagick"
-    |
-    */
-
-    'driver' => Driver::class,
-
-];