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/pt-BR.settings.ts

@@ -1026,6 +1026,7 @@ export const settingsDict = {
   "settings.openchamber.keyboardShortcuts.action.open_model_selector.label": "Abrir seletor de modelo",
   "settings.openchamber.keyboardShortcuts.action.expand_input.label": "Expandir entrada",
   "settings.openchamber.keyboardShortcuts.action.open_timeline_dialog.label": "Abrir linha do tempo da conversa",
+  "settings.openchamber.keyboardShortcuts.action.toggle_prompt_navigator.label": "Mostrar ou ocultar navegador de prompts",
   "settings.projects.sidebar.total": "Total {count}",
   "settings.projects.sidebar.actions.addProject": "Adicionar projeto",
   "settings.projects.page.empty.noProjects": "Não há projetos disponíveis.",
@@ -1770,6 +1771,8 @@ export const settingsDict = {
   "settings.openchamber.visual.field.collapsibleUserMessages": "Recolher mensagens longas do usuário",
   "settings.openchamber.visual.field.stickyUserHeaderAria": "Cabeçalho do usuário fixo",
   "settings.openchamber.visual.field.stickyUserHeader": "Cabeçalho do usuário fixo",
+  "settings.openchamber.visual.field.promptNavigatorEnabledAria": "Navegador de prompts",
+  "settings.openchamber.visual.field.promptNavigatorEnabled": "Navegador de prompts",
   "settings.openchamber.visual.field.expandedEditorToolbarAria": "Mostrar sempre a barra de ferramentas do editor",
   "settings.openchamber.visual.field.expandedEditorToolbar": "Mostrar sempre a barra de ferramentas do editor (ancorada sob as abas)",
   "settings.openchamber.visual.field.wideChatLayoutAria": "Layout de chat amplo",