fix(viewer): load the bundle from its actual dist path

The server resolves app assets as dist/$app-$name, so requesting
'viewer-init' for the viewer app looked for dist/viewer-viewer-init.mjs.
The frontend build emits dist/viewer-init.mjs, so the bundle was never
served and the viewer never initialised.

The old name was correct while the app built into its own js/ folder as a
separate repository; under the shared frontend build the app name is
already part of the file name.

Assisted-by: ClaudeCode:claude-opus-4-8
Signed-off-by: skjnldsv <skjnldsv@protonmail.com>

Author: skjnldsv

apps/viewer/lib/Listener/LoadViewerScript.php

@@ -40,8 +40,8 @@ public function handle(Event $event): void {
 			return;
 		}
 
-		Util::addStyle(Application::APP_ID, 'viewer-init');
-		Util::addInitScript(Application::APP_ID, 'viewer-init');
+		Util::addStyle(Application::APP_ID, 'init');
+		Util::addInitScript(Application::APP_ID, 'init');
 		$this->initialStateService->provideInitialState('enabled_preview_providers', array_keys($this->previewManager->getProviders()));
 	}
 }