Report exceptions from Micropub 500 error paths instead of swallowing them

MicropubController's catch-all handlers returned a generic 500 without
ever calling report(), so failures never reached laravel.log or Flare
(Flare is already wired up via bootstrap/app.php). Widened the final
catch to \Throwable so PHP Errors (e.g. TypeError) get the same
Micropub-shaped error response and are also reported.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

tests/Feature/MicropubControllerTest.php

@@ -4,6 +4,7 @@ declare(strict_types=1);
 
 namespace Tests\Feature;
 
+use App\Exceptions\MicropubHandlerException;
 use App\Jobs\SendWebMentions;
 use App\Jobs\SyndicateNoteToBluesky;
 use App\Jobs\SyndicateNoteToMastodon;
@@ -12,6 +13,7 @@ use App\Models\Note;
 use App\Models\Place;
 use App\Models\SyndicationTarget;
 use Faker\Factory;
+use Illuminate\Contracts\Debug\ExceptionHandler;
 use Illuminate\Foundation\Testing\RefreshDatabase;
 use Illuminate\Support\Carbon;
 use Illuminate\Support\Facades\Queue;
@@ -457,6 +459,11 @@ class MicropubControllerTest extends TestCase
     #[Test]
     public function micropub_client_api_request_for_unsupported_post_type_returns_error(): void
     {
+        $this->mock(ExceptionHandler::class)
+            ->shouldReceive('report')
+            ->once()
+            ->with(\Mockery::type(MicropubHandlerException::class));
+
         $response = $this->postJson(
             '/api/post',
             [