feat: improve VS Code editor chat actions

Targets active editor chat before falling back to sidebar
Adds session open-in-editor action in the VS Code sidebar
Uses attachment badges for VS Code file and selection context

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

@@ -89,6 +89,7 @@ export const dict: Record<I18nKey, string> = {
   'sessions.sidebar.session.menu.exportMarkdown': 'Eksportuj Markdown',
   'sessions.sidebar.session.menu.runFusion': 'Uruchom fusion',
   'sessions.sidebar.session.menu.openInSidePanel': 'Otwórz w panelu bocznym',
+  'sessions.sidebar.session.actions.openInEditor': 'Otwórz w edytorze',
   'sessions.sidebar.session.menu.betaBadge': 'beta',
   'sessions.sidebar.session.menu.label': 'Menu sesji',
   'sessions.sidebar.session.untitled': 'Nienazwana Sesja',