feat(chat): desktop prompt navigator rail (#2054)

* feat(chat): add desktop prompt navigator rail

Add a ChatGPT-style right-center prompt marker rail for web/desktop chat
with hover/keyboard preview panel, load-more for partial history (panel only),
Chat setting, and mod+alt+p shortcut. Disabled in VS Code across rail,
shortcut, settings, help, and search surfaces.

Co-authored-by: Serhii Dziupin <makeittech@users.noreply.github.com>

* fix(ui): read promptNavigatorEnabled from getState in shortcut handler

Match the file convention used by other shortcut handlers so the toggle
does not rely on a hook-level selector closure.

Co-authored-by: Serhii Dziupin <makeittech@users.noreply.github.com>

* fix(ui): drop use-no-memo and default prompt navigator off

Remove the project-unprecedented React Compiler opt-out, and ship the
prompt navigator as opt-in to match other recent chat UI toggles.

Co-authored-by: Serhii Dziupin <makeittech@users.noreply.github.com>

---------

Co-authored-by: Cursor Agent <cursoragent@cursor.com>
Co-authored-by: Serhii Dziupin <makeittech@users.noreply.github.com>

packages/ui/src/lib/i18n/messages/ko.ts

@@ -1565,6 +1565,7 @@ export const dict: Record<I18nKey, string> = {
   'helpDialog.item.createNewSession': '새 세션 만들기',
   'helpDialog.item.createNewWorktreeDraft': '새 워크트리 드래프트 만들기',
   'helpDialog.item.focusChatInput': '채팅 입력창으로 포커스 이동',
+  'helpDialog.item.togglePromptNavigator': '프롬프트 탐색기 표시/숨기기',
   'helpDialog.item.abortActiveRun': '활성 실행 중단(두 번 누르기)',
   'helpDialog.item.toggleRightSidebar': '오른쪽 사이드바 전환',
   'helpDialog.item.openRightSidebarGitTab': '오른쪽 사이드바 Git 탭 열기',
@@ -1759,6 +1760,9 @@ export const dict: Record<I18nKey, string> = {
   'chat.draftStarters.sectionSkills': 'Skills',
   'chat.draftStarters.remove': 'Remove',
   'chat.scrollToBottom.aria': '맨 아래로 스크롤',
+  'chat.promptNavigator.aria': '프롬프트 탐색',
+  'chat.promptNavigator.currentPrompt': '현재 프롬프트',
+  'chat.promptNavigator.loadMore': '더 많은 프롬프트 불러오기',
   'chat.timeline.relative.justNow': '방금 전',
   'chat.timeline.relative.minutesAgo': '{count}분 전',
   'chat.timeline.relative.hoursAgo': '{count}시간 전',