feat: 相册点击直接进大图查看器,移除「选择图片」列表

- AlbumBubble: 点 +N 直接打开全屏查看器(从该图开始),删除中间的选择列表弹窗
- ImageLightbox: 底部加可滑动缩略图条(当前高亮+自动滚动定位),顶栏加下载按钮
- 下载按钮保证此前藏在 +N 列表里的图片仍可下载

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/components/messageStream/overlays/ImageLightbox.tsx

@@ -8,9 +8,14 @@ import {
   type PropsWithChildren,
 } from "react";
 import { createPortal } from "react-dom";
-import { ChevronLeft, ChevronRight, X } from "lucide-react";
+import { ChevronLeft, ChevronRight, LoaderCircle, X } from "lucide-react";
 import type { Attachment } from "../../../types/post";
+import { DownloadCloudIcon } from "../../icons/DownloadCloudIcon";
+import { useI18n } from "../../../i18n";
+import { useToast } from "../../Toast";
+import { BubbleImage } from "../BubbleImage";
 import { autolink } from "../utils/autolink";
+import { downloadAttachment } from "../utils/downloadFile";
 
 type LightboxState = {
   images: Attachment[];
@@ -65,6 +70,7 @@ export function ImageLightboxProvider({ children }: PropsWithChildren) {
           images={state.images}
           startIndex={state.index}
           caption={state.caption}
+          postId={state.postId}
           onClose={closeLightbox}
         />
       ) : null}
@@ -72,15 +78,118 @@ export function ImageLightboxProvider({ children }: PropsWithChildren) {
   );
 }
 
+function LightboxDownloadButton({
+  postId,
+  attachment,
+}: {
+  postId: string;
+  attachment: Attachment;
+}) {
+  const { t } = useI18n();
+  const { showToast } = useToast();
+  const [isDownloading, setIsDownloading] = useState(false);
+
+  const handleDownload = async () => {
+    if (isDownloading) return;
+    setIsDownloading(true);
+    try {
+      await downloadAttachment(postId, attachment.id, attachment.filename);
+      showToast(t("downloadOk"));
+    } catch {
+      showToast(t("downloadFail"), "error");
+    } finally {
+      setIsDownloading(false);
+    }
+  };
+
+  return (
+    <button
+      type="button"
+      onClick={(e) => {
+        e.stopPropagation();
+        handleDownload();
+      }}
+      disabled={isDownloading}
+      className="flex h-10 w-10 items-center justify-center rounded-full bg-white/10 text-white transition hover:bg-white/20 disabled:cursor-wait"
+      aria-label={isDownloading ? t("downloading") : t("download")}
+      aria-busy={isDownloading}
+    >
+      {isDownloading ? (
+        <LoaderCircle className="h-5 w-5 animate-spin" strokeWidth={2.3} />
+      ) : (
+        <DownloadCloudIcon className="h-5 w-5" />
+      )}
+    </button>
+  );
+}
+
+function Filmstrip({
+  images,
+  index,
+  onSelect,
+}: {
+  images: Attachment[];
+  index: number;
+  onSelect: (i: number) => void;
+}) {
+  const activeRef = useRef<HTMLButtonElement | null>(null);
+
+  useEffect(() => {
+    activeRef.current?.scrollIntoView({
+      behavior: "smooth",
+      block: "nearest",
+      inline: "center",
+    });
+  }, [index]);
+
+  return (
+    <div
+      className="shrink-0 bg-gradient-to-t from-black/90 to-transparent pb-[max(env(safe-area-inset-bottom),0.75rem)] pt-3"
+      onClick={(e) => e.stopPropagation()}
+    >
+      <div className="mx-auto flex max-w-[920px] gap-2 overflow-x-auto px-4 [-ms-overflow-style:none] [scrollbar-width:none] [&::-webkit-scrollbar]:hidden">
+        {images.map((image, i) => {
+          const active = i === index;
+          return (
+            <button
+              key={image.id}
+              ref={active ? activeRef : null}
+              type="button"
+              onClick={(e) => {
+                e.stopPropagation();
+                onSelect(i);
+              }}
+              className={`relative h-14 w-14 shrink-0 overflow-hidden rounded-lg bg-black transition duration-200 md:h-16 md:w-16 ${
+                active
+                  ? "opacity-100 ring-2 ring-white"
+                  : "opacity-45 hover:opacity-80"
+              }`}
+              aria-label={`Image ${i + 1}`}
+              aria-current={active}
+            >
+              <BubbleImage
+                src={image.thumbnailUrl ?? image.thumbUrl ?? image.url}
+                className="h-full w-full object-cover"
+              />
+            </button>
+          );
+        })}
+      </div>
+    </div>
+  );
+}
+
 function LightboxView({
   images,
   startIndex,
   caption: captionText,
+  postId,
   onClose,
 }: {
   images: Attachment[];
   startIndex: number;
   caption?: string;
+  postId?: string;
   onClose: () => void;
 }) {
   const [index, setIndex] = useState(startIndex);
@@ -118,6 +227,7 @@ function LightboxView({
   const current = images[index];
   const caption = captionText?.trim();
   const showCaption = !!caption && isCaptionVisible;
+  const hasMany = images.length > 1;
   if (!current) return null;
 
   return createPortal(
@@ -127,51 +237,64 @@ function LightboxView({
       role="dialog"
       aria-modal="true"
     >
-      <button
-        type="button"
-        onClick={(e) => {
-          e.stopPropagation();
-          onClose();
-        }}
-        className="absolute right-4 top-4 z-10 flex h-10 w-10 items-center justify-center rounded-full bg-white/10 text-white transition hover:bg-white/20"
-        aria-label="Close"
+      {/* Top bar: counter + actions */}
+      <div
+        className="relative z-20 flex shrink-0 items-center justify-between px-4 pb-2 pt-[max(env(safe-area-inset-top),1rem)]"
+        onClick={(e) => e.stopPropagation()}
       >
-        <X className="h-5 w-5" />
-      </button>
-
-      {images.length > 1 ? (
-        <>
+        <div className="flex h-10 items-center">
+          {hasMany ? (
+            <span className="rounded-full bg-white/10 px-3 py-1 text-xs font-medium text-white">
+              {index + 1} / {images.length}
+            </span>
+          ) : null}
+        </div>
+        <div className="flex items-center gap-2">
+          {postId ? (
+            <LightboxDownloadButton postId={postId} attachment={current} />
+          ) : null}
           <button
             type="button"
-            onClick={(e) => {
-              e.stopPropagation();
-              goPrev();
-            }}
-            className="absolute left-2 top-1/2 z-10 flex h-12 w-12 -translate-y-1/2 items-center justify-center rounded-full bg-white/10 text-white transition hover:bg-white/20 md:left-6"
-            aria-label="Previous"
+            onClick={onClose}
+            className="flex h-10 w-10 items-center justify-center rounded-full bg-white/10 text-white transition hover:bg-white/20"
+            aria-label="Close"
           >
-            <ChevronLeft className="h-6 w-6" />
+            <X className="h-5 w-5" />
           </button>
-          <button
-            type="button"
-            onClick={(e) => {
-              e.stopPropagation();
-              goNext();
-            }}
-            className="absolute right-2 top-1/2 z-10 flex h-12 w-12 -translate-y-1/2 items-center justify-center rounded-full bg-white/10 text-white transition hover:bg-white/20 md:right-6"
-            aria-label="Next"
-          >
-            <ChevronRight className="h-6 w-6" />
-          </button>
-          <div className="absolute left-1/2 top-4 z-10 -translate-x-1/2 rounded-full bg-white/10 px-3 py-1 text-xs text-white">
-            {index + 1} / {images.length}
-          </div>
-        </>
-      ) : null}
+        </div>
+      </div>
+
+      {/* Image stage */}
+      <div className="relative flex min-h-0 w-full flex-1 items-center justify-center">
+        {hasMany ? (
+          <>
+            <button
+              type="button"
+              onClick={(e) => {
+                e.stopPropagation();
+                goPrev();
+              }}
+              className="absolute left-2 top-1/2 z-10 flex h-12 w-12 -translate-y-1/2 items-center justify-center rounded-full bg-white/10 text-white transition hover:bg-white/20 md:left-6"
+              aria-label="Previous"
+            >
+              <ChevronLeft className="h-6 w-6" />
+            </button>
+            <button
+              type="button"
+              onClick={(e) => {
+                e.stopPropagation();
+                goNext();
+              }}
+              className="absolute right-2 top-1/2 z-10 flex h-12 w-12 -translate-y-1/2 items-center justify-center rounded-full bg-white/10 text-white transition hover:bg-white/20 md:right-6"
+              aria-label="Next"
+            >
+              <ChevronRight className="h-6 w-6" />
+            </button>
+          </>
+        ) : null}
 
-      <div className="flex min-h-0 w-full flex-1 items-center justify-center px-4 py-16">
         <div
-          className="flex h-full w-full items-center justify-center"
+          className="flex h-full w-full items-center justify-center px-4 py-2"
           onClick={(e) => {
             e.stopPropagation();
             if (caption) setIsCaptionVisible((visible) => !visible);
@@ -192,21 +315,26 @@ function LightboxView({
           <img
             src={current.url}
             alt={current.filename}
-            className="max-h-full max-w-full object-contain select-none"
+            className="max-h-full max-w-full select-none object-contain"
             draggable={false}
           />
         </div>
+
+        {showCaption ? (
+          <div
+            className="absolute inset-x-0 bottom-0 z-20 bg-gradient-to-t from-black via-black/90 to-black/70 px-4 py-4 text-sm leading-snug text-white sm:px-6"
+            onClick={(e) => e.stopPropagation()}
+          >
+            <div className="message-stream-copyable-text mx-auto max-h-[32vh] max-w-[920px] overflow-y-auto whitespace-pre-wrap break-words [-ms-overflow-style:none] [scrollbar-width:none] [&::-webkit-scrollbar]:hidden">
+              {autolink(caption)}
+            </div>
+          </div>
+        ) : null}
       </div>
 
-      {showCaption ? (
-        <div
-          className="absolute inset-x-0 bottom-0 z-20 bg-gradient-to-t from-black via-black/90 to-black/70 px-4 py-4 text-sm leading-snug text-white sm:px-6"
-          onClick={(e) => e.stopPropagation()}
-        >
-          <div className="message-stream-copyable-text mx-auto max-h-[32vh] max-w-[920px] overflow-y-auto whitespace-pre-wrap break-words [-ms-overflow-style:none] [scrollbar-width:none] [&::-webkit-scrollbar]:hidden">
-            {autolink(caption)}
-          </div>
-        </div>
+      {/* Bottom thumbnail filmstrip */}
+      {hasMany ? (
+        <Filmstrip images={images} index={index} onSelect={setIndex} />
       ) : null}
     </div>,
     document.body,