feat: add internal skg infinite canvas

web/app/page.tsx

@@ -511,15 +511,24 @@ export default function Home() {
                   <span>{activeMode.needsFirstFrame ? "图片作为参考帧" : "只根据文字生成"}</span>
                 </div>
 
-                <button
-                  type="button"
-                  onClick={runPrimary}
-                  disabled={!!busy}
-                  className="inline-flex h-10 min-w-28 items-center justify-center gap-2 rounded-full bg-cyan-200 px-5 text-sm font-semibold text-black transition hover:bg-white disabled:cursor-not-allowed disabled:opacity-60"
-                >
-                  {submitting ? <Loader2 className="h-4 w-4 animate-spin" /> : <ArrowUp className="h-4 w-4" />}
-                  生成
-                </button>
+                <div className="flex items-center gap-2">
+                  <a
+                    href="/canvas/"
+                    className="inline-flex h-10 items-center justify-center gap-2 rounded-full border border-white/10 bg-white/6 px-4 text-sm font-semibold text-white/72 transition hover:border-cyan-200/24 hover:text-cyan-100"
+                  >
+                    <ExternalLink className="h-4 w-4" />
+                    无限画布
+                  </a>
+                  <button
+                    type="button"
+                    onClick={runPrimary}
+                    disabled={!!busy}
+                    className="inline-flex h-10 min-w-28 items-center justify-center gap-2 rounded-full bg-cyan-200 px-5 text-sm font-semibold text-black transition hover:bg-white disabled:cursor-not-allowed disabled:opacity-60"
+                  >
+                    {submitting ? <Loader2 className="h-4 w-4 animate-spin" /> : <ArrowUp className="h-4 w-4" />}
+                    生成
+                  </button>
+                </div>
               </div>
             </section>