feat: 支持微信视频消息解析与播放

支持视频 XML 解析、本地文件映射与拖动播放。

修复源码乱码注释并统一 UTF-8 编码。

src/renderer/src/assets/main.css

@@ -1375,6 +1375,54 @@ body {
   display: none;
 }
 
+.video-message-bubble {
+  padding: 0;
+  overflow: hidden;
+  background: #101412;
+  border-color: rgba(0, 0, 0, 0.12);
+}
+
+.wechat-message-row.mine .video-message-bubble {
+  background: #101412;
+}
+
+.video-message {
+  position: relative;
+  width: min(320px, 48vw);
+  min-height: 140px;
+  background: #101412;
+}
+
+.video-content {
+  display: block;
+  width: 100%;
+  max-height: 360px;
+  object-fit: contain;
+  background: #101412;
+}
+
+.video-duration {
+  position: absolute;
+  right: 8px;
+  top: 8px;
+  padding: 2px 6px;
+  border-radius: 8px;
+  color: #fff;
+  background: rgba(0, 0, 0, 0.55);
+  font-size: 11px;
+  pointer-events: none;
+}
+
+.video-placeholder {
+  display: grid;
+  place-items: center;
+  width: min(260px, 44vw);
+  min-height: 120px;
+  padding: 16px;
+  color: rgba(255, 255, 255, 0.78);
+  text-align: center;
+}
+
 .image-bubble {
   position: relative;
   max-width: min(260px, 46vw);