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.settings.ts

@@ -1026,6 +1026,7 @@ export const settingsDict = {
   'settings.openchamber.keyboardShortcuts.action.open_model_selector.label': '모델 선택기 열기',
   'settings.openchamber.keyboardShortcuts.action.expand_input.label': '입력 확장',
   'settings.openchamber.keyboardShortcuts.action.open_timeline_dialog.label': '대화 타임라인 열기',
+  'settings.openchamber.keyboardShortcuts.action.toggle_prompt_navigator.label': '프롬프트 탐색기 표시/숨기기',
   'settings.projects.sidebar.total': '총 {count}개',
   'settings.projects.sidebar.actions.addProject': '프로젝트 추가',
   'settings.projects.page.empty.noProjects': '사용 가능한 프로젝트가 없습니다.',
@@ -1770,6 +1771,8 @@ export const settingsDict = {
   'settings.openchamber.visual.field.collapsibleUserMessages': '긴 사용자 메시지 접기',
   'settings.openchamber.visual.field.stickyUserHeaderAria': '고정 사용자 헤더',
   'settings.openchamber.visual.field.stickyUserHeader': '고정 사용자 헤더',
+  'settings.openchamber.visual.field.promptNavigatorEnabledAria': '프롬프트 탐색기',
+  'settings.openchamber.visual.field.promptNavigatorEnabled': '프롬프트 탐색기',
   'settings.openchamber.visual.field.expandedEditorToolbarAria': 'Always show editor toolbar',
   'settings.openchamber.visual.field.expandedEditorToolbar': 'Always show editor toolbar (docked under the file tabs)',
   'settings.openchamber.visual.field.wideChatLayoutAria': '넓은 채팅 레이아웃',