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/lib/media-catalog.ts

@@ -169,3 +169,16 @@ export const desktopMonitoringMediaCatalog: DesktopMediaDefinition[] = aiPlatfor
 }));
 
 export const desktopMediaCatalog = [...desktopPublishMediaCatalog, ...desktopMonitoringMediaCatalog];
+
+export function getDesktopMediaDefinition(platform: string): DesktopMediaDefinition | null {
+  const key = (platform ?? "").toLowerCase();
+  return desktopMediaCatalog.find((item) => item.id === key) ?? null;
+}
+
+export function translateDesktopPlatform(platform: string): string {
+  return getDesktopMediaDefinition(platform)?.label ?? "未知平台";
+}
+
+export function desktopPlatformShortName(platform: string): string {
+  return getDesktopMediaDefinition(platform)?.shortName ?? "未";
+}