fix: render chat media by URL (images/video/voice) instead of unknown-type placeholder

MessageBubble.vue was keys off the (incomplete) type code, so many messages
with real OSS media URLs (https://wx.oss.yunkecn.com/.../*.webp|*.mp4) showed
as '[未知消息]'. Rendering is now URL-driven: pick the best http URL from
file_url > file_hd_url > file_th_url, then render by extension
(image/video/audio/file). Type code is only used as a last-resort label.

- MessageBubble.vue: URL-driven cascade (URL by ext → duration →
  transcription → text → structured-type placeholder → localized tag).
  Image/video/audio/file children @click.stop so the all-fields drawer
  still opens on bubble click but not on media interactions.
- format.ts: wechatTypeLabel(type_raw) maps known codes (3→图片, 34→语音,
  43→图片/表情, 49→文件/名片, 42→名片, 9→表情, 20→红包/转账).
- ChatTimeline.vue drawer type tag uses wechatTypeLabel for WeChat msgs.
- style.css: compact .yk-msg__audio player for voice-with-URL messages.

Verified against smoke.db: 25 type-3 images + 3 type-43 videos that
previously showed '[未知消息]' now render as images/video. Build clean.

Co-Authored-By: Claude <noreply@anthropic.com>

yunkes/src/views/ChatTimeline.vue

@@ -6,7 +6,7 @@ import { ArrowLeft } from '@element-plus/icons-vue'
 import { getMessages } from '@/api'
 import type { Channel, Message } from '@/api/types'
 import MessageBubble from '@/components/MessageBubble.vue'
-import { channelLabel, formatTime } from '@/utils/format'
+import { channelLabel, formatTime, wechatTypeLabel } from '@/utils/format'
 import { buildMessageSections } from '@/utils/messageFields'
 
 /**
@@ -238,12 +238,12 @@ onMounted(loadInitial)
             {{ channelLabel(channelTyped) }}
           </el-tag>
           <el-tag
-            v-if="drawerMessage.type"
+            v-if="drawerMessage.type || drawerMessage.type_raw != null"
             size="small"
             type="info"
             effect="plain"
           >
-            {{ drawerMessage.type }}
+            {{ drawerMessage.channel === 'wechat' ? wechatTypeLabel(drawerMessage.type_raw) : (drawerMessage.type || '消息') }}
             <template v-if="drawerMessage.type_raw != null">
               ({{ drawerMessage.type_raw }})
             </template>