feat: import Chinese-localized Buzz source snapshot

Signed-off-by: cls_宁波本机 <908705107@qq.com>

mobile/lib/features/channels/media_viewer_page/video_controls.dart

@@ -0,0 +1,142 @@
+part of '../media_viewer_page.dart';
+
+/// Video transport and message actions, kept visually aligned with the image
+/// viewer chrome while the native player owns decoding and playback.
+class _VideoViewerBottomControls extends StatelessWidget {
+  final VideoPlayerController? controller;
+  final VoidCallback? onReply;
+
+  const _VideoViewerBottomControls({
+    required this.controller,
+    required this.onReply,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    final readyController = controller?.value.isInitialized == true
+        ? controller
+        : null;
+    return Padding(
+      padding: const EdgeInsets.fromLTRB(Grid.sm, Grid.xxs, Grid.sm, 0),
+      child: Column(
+        mainAxisSize: MainAxisSize.min,
+        children: [
+          if (readyController != null)
+            _VideoTransportBar(controller: readyController),
+          Row(
+            children: [
+              _MediaViewerCircleButton(
+                key: const ValueKey('message-media-video-viewer-reply-thread'),
+                icon: LucideIcons.messageSquareReply,
+                tooltip: context.l10n.replyInThread,
+                onPressed: onReply,
+              ),
+              const Spacer(),
+            ],
+          ),
+        ],
+      ),
+    );
+  }
+}
+
+class _VideoTransportBar extends HookConsumerWidget {
+  final VideoPlayerController controller;
+
+  const _VideoTransportBar({required this.controller});
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    useListenable(controller);
+    final value = controller.value;
+    final durationMs = value.duration.inMilliseconds;
+    final positionMs = value.position.inMilliseconds.clamp(0, durationMs);
+    final hasDuration = durationMs > 0;
+
+    return Padding(
+      padding: const EdgeInsets.only(bottom: Grid.xxs),
+      child: DecoratedBox(
+        decoration: BoxDecoration(
+          color: Colors.black.withValues(alpha: 0.42),
+          border: Border.all(color: Colors.white.withValues(alpha: 0.12)),
+          borderRadius: BorderRadius.circular(Radii.full),
+        ),
+        child: Padding(
+          padding: const EdgeInsets.symmetric(horizontal: Grid.xxs),
+          child: Row(
+            children: [
+              IconButton(
+                key: const ValueKey('message-media-video-viewer-play-pause'),
+                onPressed: () {
+                  if (value.isPlaying) {
+                    controller.pause();
+                  } else {
+                    controller.play();
+                  }
+                },
+                tooltip: value.isPlaying
+                    ? context.l10n.pauseVideo
+                    : context.l10n.playVideo,
+                icon: Icon(
+                  value.isPlaying ? LucideIcons.pause : LucideIcons.play,
+                  color: Colors.white,
+                ),
+              ),
+              Text(
+                _formatVideoDuration(Duration(milliseconds: positionMs)),
+                style: context.textTheme.labelSmall?.copyWith(
+                  color: Colors.white,
+                  fontFeatures: const [FontFeature.tabularFigures()],
+                ),
+              ),
+              Expanded(
+                child: SliderTheme(
+                  data: SliderTheme.of(context).copyWith(
+                    activeTrackColor: Colors.white,
+                    inactiveTrackColor: Colors.white.withValues(alpha: 0.28),
+                    thumbColor: Colors.white,
+                    overlayColor: Colors.white.withValues(alpha: 0.12),
+                    trackHeight: 3,
+                    thumbShape: const RoundSliderThumbShape(
+                      enabledThumbRadius: 5,
+                    ),
+                  ),
+                  child: Slider(
+                    value: hasDuration ? positionMs.toDouble() : 0,
+                    min: 0,
+                    max: hasDuration ? durationMs.toDouble() : 1,
+                    onChanged: hasDuration
+                        ? (next) => controller.seekTo(
+                            Duration(milliseconds: next.round()),
+                          )
+                        : null,
+                  ),
+                ),
+              ),
+              Text(
+                _formatVideoDuration(value.duration),
+                style: context.textTheme.labelSmall?.copyWith(
+                  color: Colors.white.withValues(alpha: 0.78),
+                  fontFeatures: const [FontFeature.tabularFigures()],
+                ),
+              ),
+              const SizedBox(width: Grid.xxs),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+}
+
+String _formatVideoDuration(Duration duration) {
+  final totalSeconds = duration.inSeconds.clamp(0, 359999);
+  final hours = totalSeconds ~/ 3600;
+  final minutes = (totalSeconds % 3600) ~/ 60;
+  final seconds = totalSeconds % 60;
+  final paddedSeconds = seconds.toString().padLeft(2, '0');
+  if (hours > 0) {
+    return '$hours:${minutes.toString().padLeft(2, '0')}:$paddedSeconds';
+  }
+  return '$minutes:$paddedSeconds';
+}