feat(sidebar): add dialogue selection and copying

- Support multi-row selection with clean clipboard text
- Preserve selections across playback updates and clear them on source changes

src/renderer/overlay-mouse-ignore.ts

@@ -27,7 +27,9 @@ function isYomitanPopupInteractionActive(state: RendererState): boolean {
 
 export function syncOverlayMouseIgnoreState(ctx: RendererContext): void {
   const shouldKeepWindowInteractive =
-    isYomitanPopupInteractionActive(ctx.state) || isBlockingOverlayModalOpen(ctx.state);
+    ctx.dom.subtitleSidebarList?.dataset?.selecting === 'true' ||
+    isYomitanPopupInteractionActive(ctx.state) ||
+    isBlockingOverlayModalOpen(ctx.state);
   const shouldStayInteractive =
     ctx.state.isOverSubtitle ||
     ctx.state.isOverSubtitleSidebar ||