feat(lightbox): 用户主页头像可预览，图箱支持缩放旋转反色

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/app/globals.css

@@ -4579,28 +4579,57 @@ html.dark .prose-content pre[data-theme] span {
   inset: 0;
   z-index: 1200;
   display: flex;
-  align-items: center;
-  justify-content: center;
-  padding: 1.5rem;
+  flex-direction: column;
   background: rgba(0, 0, 0, 0.82);
   backdrop-filter: blur(2px);
 }
+.md-lightbox-stage {
+  flex: 1;
+  min-height: 0;
+  width: 100%;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  overflow: hidden;
+  touch-action: none;
+}
+.md-lightbox-stage.is-zoomed { cursor: grab; }
+.md-lightbox-stage.is-panning { cursor: grabbing; }
 .md-lightbox-figure {
   margin: 0;
-  max-width: min(96vw, 1200px);
-  max-height: 90vh;
   display: flex;
-  flex-direction: column;
   align-items: center;
-  gap: 0.75rem;
+  justify-content: center;
 }
 .md-lightbox-img {
-  max-width: 100%;
-  max-height: calc(90vh - 3rem);
+  max-width: min(92vw, 1200px);
+  max-height: calc(100vh - 8.5rem);
   object-fit: contain;
   border-radius: 8px;
   box-shadow: 0 12px 40px rgba(0, 0, 0, 0.45);
   user-select: none;
+  transform-origin: center center;
+  transition: transform 0.15s ease, filter 0.15s ease;
+}
+.md-lightbox-img.is-odd-rot {
+  max-width: calc(100vh - 8.5rem);
+  max-height: min(92vw, 1200px);
+}
+.md-lightbox-stage.is-panning .md-lightbox-img,
+.md-lightbox-img.is-snap {
+  transition: none;
+}
+.md-lightbox-footer {
+  position: absolute;
+  bottom: 1rem;
+  left: 50%;
+  transform: translateX(-50%);
+  z-index: 2;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  gap: 0.5rem;
+  max-width: calc(100vw - 2rem);
 }
 .md-lightbox-caption {
   color: rgba(255, 255, 255, 0.85);
@@ -4608,10 +4637,74 @@ html.dark .prose-content pre[data-theme] span {
   text-align: center;
   max-width: 40rem;
   line-height: 1.5;
+  margin: 0;
+  text-shadow: 0 1px 8px rgba(0, 0, 0, 0.55);
+}
+.md-lightbox-toolbar {
+  display: flex;
+  align-items: center;
+  gap: 2px;
+  padding: 5px;
+  border-radius: 999px;
+  background: rgba(0, 0, 0, 0.48);
+  backdrop-filter: blur(10px);
+  max-width: 100%;
+  overflow-x: auto;
+}
+.md-lightbox-tool,
+.md-lightbox-zoom-label {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  border: none;
+  border-radius: 999px;
+  background: transparent;
+  color: #fff;
+  cursor: pointer;
+  transition: background 0.15s ease;
+}
+.md-lightbox-tool {
+  width: 36px;
+  height: 36px;
+  flex-shrink: 0;
+}
+.md-lightbox-zoom-label {
+  min-width: 3.25rem;
+  height: 36px;
+  padding: 0 0.35rem;
+  font-size: 12px;
+  font-variant-numeric: tabular-nums;
+  letter-spacing: 0.02em;
+}
+.md-lightbox-tool:hover,
+.md-lightbox-zoom-label:hover {
+  background: rgba(255, 255, 255, 0.14);
+}
+.md-lightbox-tool.is-on {
+  background: rgba(255, 255, 255, 0.22);
+}
+.md-lightbox-tool:disabled,
+.md-lightbox-zoom-label:disabled {
+  opacity: 0.35;
+  cursor: default;
+  background: transparent;
+}
+.md-lightbox-tool:focus-visible,
+.md-lightbox-zoom-label:focus-visible {
+  outline: 2px solid rgba(255, 255, 255, 0.7);
+  outline-offset: 1px;
+}
+.md-lightbox-sep {
+  width: 1px;
+  height: 16px;
+  margin: 0 4px;
+  background: rgba(255, 255, 255, 0.22);
+  flex-shrink: 0;
 }
 .md-lightbox-close,
 .md-lightbox-nav {
   position: absolute;
+  z-index: 3;
   display: inline-flex;
   align-items: center;
   justify-content: center;
@@ -4641,14 +4734,12 @@ html.dark .prose-content pre[data-theme] span {
 .md-lightbox-prev { left: 1rem; }
 .md-lightbox-next { right: 1rem; }
 .md-lightbox-counter {
-  position: absolute;
-  bottom: 1.25rem;
-  left: 50%;
-  transform: translateX(-50%);
   color: rgba(255, 255, 255, 0.8);
-  font-size: 13px;
+  font-size: 12.5px;
   font-variant-numeric: tabular-nums;
   letter-spacing: 0.04em;
+  padding: 0 0.55rem;
+  white-space: nowrap;
 }
 
 /* 评论区的 Markdown 紧凑排版：继承 prose-content 全部规则，仅收紧行距与间距 */