refactor(desktop/renderer): centralize platform label and short-name lookup

Move the per-platform translation map out of HomeView/TasksView and the
titleCaseToken fallback out of PublishManagementView into shared helpers
on media-catalog. Single source of truth keeps renderer views consistent
with the binding catalog when new platforms ship.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/desktop-client/src/renderer/views/TasksView.vue

@@ -4,21 +4,12 @@ import { computed } from "vue";
 import StatusBadge from "../components/StatusBadge.vue";
 import SurfaceCard from "../components/SurfaceCard.vue";
 import { useDesktopRuntime } from "../composables/useDesktopRuntime";
-import { formatRelativeTime, titleCaseToken } from "../lib/formatters";
+import { formatRelativeTime } from "../lib/formatters";
+import { translateDesktopPlatform } from "../lib/media-catalog";
 import { taskTone } from "../lib/runtime-ui";
 
 function translatePlatform(platform: string) {
-  const map: Record<string, string> = {
-    toutiaohao: "头条号",
-    bilibili: "哔哩哔哩",
-    xiaohongshu: "小红书",
-    douyin: "抖音",
-    kuaishou: "快手",
-    wechat_oa: "微信公众号",
-    baijiahao: "百家号",
-    zhihu: "知乎",
-  };
-  return map[platform?.toLowerCase()] || titleCaseToken(platform);
+  return translateDesktopPlatform(platform);
 }
 
 function translateTaskStatus(status: string) {