tui: update compaction status message to use Session instead of History across all languages

The compaction message now correctly indicates the current session was compacted rather than the entire history, making it clearer to users which conversation data was optimized.

packages/ui/src/i18n/zht.ts

@@ -64,7 +64,7 @@ export const dict = {
   "ui.sessionTurn.status.consideringNextSteps": "正在考慮下一步",
 
   "ui.messagePart.questions.dismissed": "問題已略過",
-  "ui.messagePart.compaction": "歷史已壓縮",
+  "ui.messagePart.compaction": "工作階段已壓縮",
   "ui.messagePart.context.read.one": "{{count}} 次讀取",
   "ui.messagePart.context.read.other": "{{count}} 次讀取",
   "ui.messagePart.context.search.one": "{{count}} 次搜尋",