feat: 完善课程模板通用能力

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

src/components/common/index.ts

@@ -15,6 +15,13 @@ export type {
 	ToastViewportProps,
 } from "@/components/ui/toast";
 export { ToastProvider, ToastViewport, useToast } from "@/components/ui/toast";
+export type {
+	BackgroundContainerElement,
+	BackgroundContainerFit,
+	BackgroundContainerProps,
+	BackgroundContainerRepeat,
+} from "./BackgroundContainer";
+export { BackgroundContainer } from "./BackgroundContainer";
 export type {
 	DefineDialogOptions,
 	GuideDialogController,
@@ -31,4 +38,12 @@ export type {
 	SpotlightController,
 } from "./GuideSpotlight";
 export { defineSpotlight, GuideSpotlight } from "./GuideSpotlight";
+export type { ImageButtonProps } from "./ImageButton";
+export { ImageButton } from "./ImageButton";
 export { RouteError, RouteFallback } from "./RouteFallback";
+export type {
+	VideoOverlayProps,
+	VideoPlayerProps,
+	VideoPlayerRef,
+} from "./Video";
+export { VideoOverlay, VideoPlayer } from "./Video";