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/pl.ts

@@ -651,6 +651,9 @@ export const dict: Record<I18nKey, string> = {
   'chat.draftStarters.sectionSkills': 'Skills',
   'chat.draftStarters.remove': 'Remove',
   'chat.scrollToBottom.aria': 'Przewiń na dół',
+  'chat.promptNavigator.aria': 'Nawigacja promptów',
+  'chat.promptNavigator.currentPrompt': 'Bieżący prompt',
+  'chat.promptNavigator.loadMore': 'Wczytaj więcej promptów',
   'chat.timeline.relative.justNow': 'przed chwilą',
   'chat.timeline.relative.minutesAgo': '{count}m temu',
   'chat.timeline.relative.hoursAgo': '{count}h temu',
@@ -2183,6 +2186,7 @@ export const dict: Record<I18nKey, string> = {
   'helpDialog.item.cycleTheme': 'Przełącz motyw (Jasny → Ciemny → Systemowy)',
   'helpDialog.item.cycleThinkingVariant': 'Przełącz wariant myślenia (skrót globalny)',
   'helpDialog.item.focusChatInput': 'Ustaw fokus na polu czatu',
+  'helpDialog.item.togglePromptNavigator': 'Przełącz nawigator promptów',
   'helpDialog.item.navigateModels': 'Nawiguj po modelach (w selektorze)',
   'helpDialog.item.newWindow': 'Nowe okno (tylko desktop)',
   'helpDialog.item.openCommandPalette': 'Otwórz paletę poleceń',