remove wrapup video rendering (ffmpeg)

SPA handles wrapup visuals client-side; server-side
renderer was dead code pulling in ffmpeg + image crates.

crates/presentation/src/main.rs

@@ -209,7 +209,6 @@ async fn wire_dependencies() -> anyhow::Result<(AppState, axum::Router)> {
             event_publisher: event_publisher_arc,
             diary_exporter: Arc::new(ExportAdapter) as Arc<dyn DiaryExporter>,
             document_parser: Arc::new(ImporterDocumentParser) as Arc<dyn DocumentParser>,
-            video_renderer: None,
         },
         config: app_config,
     };