Refactor page titles and dialog close buttons across multiple views

- Replaced instances of `DialogCloseBtn` with `VDialogCloseBtn` in TransferHistoryView, AccountSettingAbout, AccountSettingSystem, and UserProfileView for consistency.
- Introduced a new component `PageContentTitle` to standardize page titles in SiteCardListView, SubscribeListView, UserListView, and WorkflowListView, improving layout and readability.
- Added keyword filtering functionality in SubscribeListView and SubscribeShareView to enhance user experience during searches.
- Added a new site logo image to the assets.

src/components/dialog/AddDownloadDialog.vue

@@ -125,7 +125,7 @@ onMounted(() => {
         <span v-if="title">{{ torrent?.site_name }} - {{ title }}</span>
         <span v-else>确认下载</span>
       </VCardTitle>
-      <DialogCloseBtn @click="emit('close')" />
+      <VDialogCloseBtn @click="emit('close')" />
       <VDivider />
       <VList lines="one">
         <VListItem>