Fork assistant turns into new drafts (#1788)

* feat(chat): fork assistant turns into new drafts

Builds chat-history attachments on the daemon and routes them into draft composers so users can continue an assistant turn in an existing workspace tab or New Workspace.

* fix(chat): clean up fork draft handling

* fix(chat): address fork draft review feedback

* fix(server): build fork context from bounded timeline

* fix(app): restore assistant turn footer in streams

* fix(app): preserve fork draft setup

* fix(app): tighten assistant fork footers

* fix(app): lock active fork draft handoff

* fix(app): preserve attachment-only draft retries

* fix(app): unify composer attachment scopes

* fix(app): align chat history attachment labels

* fix(app): centralize attachment pill content

* fix(app): trim fork context for workspace naming

packages/app/src/i18n/resources/ja.ts

@@ -248,6 +248,12 @@ export const ja: TranslationResources = {
       copyCode: "コードをコピー",
       copyTurn: "ターンをコピー",
       copyMessage: "メッセージをコピー",
+      forkMenu: "メッセージをフォーク",
+      forkInNewTab: "新しいタブにフォーク",
+      forkInNewWorkspace: "新しいワークスペースにフォーク",
+      forkUnavailable: "これを使用するにはホストを更新してください。",
+      forkMissingWorkspace: "このエージェントはワークスペース内にありません。",
+      forkFailed: "チャットのフォークに失敗しました",
       openFile: "ファイルを開く",
       copied: "コピーしました",
     },