CONV-149: Add duplicate convert protection

resources/views/livewire/dashboard/dashboard-converter.blade.php

@@ -191,8 +191,18 @@ class="flex items-center justify-between gap-4 rounded-[var(--ca-radius-md)] bor
                     <p class="text-base font-semibold text-[var(--ca-text)]">
                         Ready to convert {{ strtoupper($file->extension) }} to {{ strtoupper($selectedTargetFormat) }}
                     </p>
-                    <p class="mt-1 text-sm text-[var(--ca-muted)]">Conversion will be available in Phase 9.</p>
                 </div>
+
+                <x-button
+                    wire:click="convert"
+                    wire:loading.attr="disabled"
+                    wire:target="convert"
+                    :disabled="$step === 'converting'"
+                    class="w-full"
+                >
+                    <span wire:loading.remove wire:target="convert">Convert Now</span>
+                    <span wire:loading wire:target="convert">Starting…</span>
+                </x-button>
             </div>
         @endif
     </x-card>

tests/Feature/Livewire/DashboardConverterConvertTest.php

@@ -30,3 +30,22 @@
 
     expect(ConversionJob::query()->count())->toBe(1);
 });
+
+it('does not create duplicate conversion jobs on repeated convert calls', function () {
+    Queue::fake();
+    Storage::fake('local');
+
+    $user = User::factory()->create();
+
+    $component = Livewire::actingAs($user)
+        ->test(DashboardConverter::class)
+        ->set('upload', UploadedFile::fake()->image('avatar.png', 800, 600))
+        ->call('selectTargetFormat', 'jpg')
+        ->set('options.quality', 'high')
+        ->call('continueFromSettings');
+
+    $component->call('convert');
+    $component->call('convert');
+
+    expect(ConversionJob::query()->count())->toBe(1);
+});