Sync with engine v5

static/voice-demo/styles.css

@@ -136,7 +136,8 @@ body {
 
 .camera-drawer__preview {
   position: relative;
-  min-height: 210px;
+  aspect-ratio: 4 / 3;
+  min-height: 200px;
   overflow: hidden;
   border: 1px solid rgba(149, 160, 187, 0.28);
   border-radius: 14px;
@@ -148,6 +149,49 @@ body {
   background-size: 34px 34px, 34px 34px, auto, auto;
 }
 
+.camera-drawer__video,
+.camera-drawer__photo {
+  position: absolute;
+  inset: 0;
+  width: 100%;
+  height: 100%;
+  object-fit: cover;
+  display: none;
+  z-index: 1;
+}
+
+.camera-drawer__photo {
+  object-fit: contain;
+}
+
+.camera-drawer__preview.is-camera .camera-drawer__video {
+  display: block;
+}
+
+.camera-drawer__preview.is-photo .camera-drawer__photo {
+  display: block;
+}
+
+/* Hide the decorative lens/scan/placeholder once real media is showing. */
+.camera-drawer__preview.is-camera .camera-drawer__lens,
+.camera-drawer__preview.is-photo .camera-drawer__lens,
+.camera-drawer__preview.is-camera .camera-drawer__scan,
+.camera-drawer__preview.is-photo .camera-drawer__scan,
+.camera-drawer__preview.is-camera .camera-drawer__placeholder,
+.camera-drawer__preview.is-photo .camera-drawer__placeholder {
+  display: none;
+}
+
+.camera-drawer__placeholder {
+  position: absolute;
+  inset: auto 18px 16px;
+  z-index: 2;
+  color: rgba(214, 220, 235, 0.78);
+  font-size: 12px;
+  line-height: 1.5;
+  text-align: center;
+}
+
 .camera-drawer__lens {
   position: absolute;
   top: 50%;
@@ -174,6 +218,7 @@ body {
 
 .camera-drawer__corner {
   position: absolute;
+  z-index: 2;
   width: 28px;
   height: 28px;
   border-color: rgba(255, 255, 255, 0.7);
@@ -229,6 +274,87 @@ body {
   cursor: not-allowed;
 }
 
+/* 上传图片 + 使用摄像头 share one row. */
+.camera-drawer__sources {
+  display: flex;
+  gap: 8px;
+}
+
+/* The camera device dropdown only appears after "使用摄像头" is selected. */
+.camera-drawer__device-row {
+  max-width: none;
+}
+
+.camera-drawer__device-row[hidden] {
+  display: none;
+}
+
+/* Active state for the "使用摄像头" button once the camera is live. */
+.camera-drawer__source.is-active {
+  border-color: var(--success);
+  color: var(--success);
+}
+
+.camera-drawer__source {
+  flex: 1 1 0;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  text-align: center;
+  min-height: 38px;
+  font-size: 13px;
+  font-weight: 600;
+  cursor: pointer;
+}
+
+
+.camera-drawer__source.is-active {
+  border-color: var(--success);
+  color: var(--success);
+}
+
+.camera-drawer__source:disabled {
+  opacity: 0.5;
+  cursor: not-allowed;
+}
+
+.camera-drawer__samples {
+  display: grid;
+  grid-template-columns: repeat(4, 1fr);
+  gap: 8px;
+}
+
+.camera-drawer__samples:empty {
+  display: none;
+}
+
+.camera-drawer__sample {
+  position: relative;
+  aspect-ratio: 4 / 3;
+  padding: 0;
+  border: 2px solid transparent;
+  border-radius: 10px;
+  overflow: hidden;
+  cursor: pointer;
+  background: #0f141f;
+}
+
+.camera-drawer__sample img {
+  width: 100%;
+  height: 100%;
+  object-fit: contain;
+  display: block;
+}
+
+.camera-drawer__sample:hover {
+  border-color: rgba(149, 160, 187, 0.6);
+}
+
+.camera-drawer__sample.is-selected {
+  border-color: var(--success);
+  box-shadow: 0 0 0 1px var(--success);
+}
+
 .app__body {
   display: grid;
   grid-template-columns: minmax(0, 1fr) clamp(300px, 32vw, 420px);
@@ -511,6 +637,18 @@ body {
   margin-bottom: 4px;
 }
 
+.bubble__image {
+  display: block;
+  max-width: 240px;
+  width: 100%;
+  border-radius: 10px;
+  margin-bottom: 6px;
+}
+
+.bubble__image + .bubble__text:empty {
+  display: none;
+}
+
 /* WebSocket log --------------------------------------------------------- */
 
 .ws-log {
@@ -567,8 +705,8 @@ body {
   margin: 0;
   font-size: 12px;
   color: var(--text-dim);
-  text-transform: uppercase;
-  letter-spacing: 0.8px;
+  letter-spacing: 0.5px;
+  white-space: nowrap;
 }
 
 .ws-log__header-left {
@@ -823,11 +961,7 @@ body {
   outline: none;
   width: 100%;
   cursor: pointer;
-}
-
-.device-picker__select:focus {
-  border-color: var(--accent);
-  box-shadow: 0 0 0 3px rgba(79, 140, 255, 0.18);
+  text-overflow: ellipsis;
 }
 
 .device-picker__select:disabled {
@@ -835,6 +969,11 @@ body {
   cursor: not-allowed;
 }
 
+.device-picker__select:focus {
+  border-color: var(--accent);
+  box-shadow: 0 0 0 3px rgba(79, 140, 255, 0.18);
+}
+
 .mic-btn {
   display: inline-flex;
   align-items: center;