Switch projects from New Workspace with ⌘P/Ctrl+P (#2110)

* feat(app): add ⌘P shortcut to switch project on New Workspace screen

Opens the existing project picker with its search focused so the project
can be switched from the keyboard (type + Enter) instead of clicking the
badge and then the project.

Wires a new "workspace.project.pick" action through the standard keyboard
pipeline (binding -> route passthrough -> dispatcher), handled by a
screen-scoped handler on the New Workspace screen that is only registered
while the screen is mounted and there are projects to pick. Because
preventDefault only fires when a handler handles the key, ⌘P/Ctrl+P still
triggers native print everywhere else. Adds a Settings -> Shortcuts help
row (rebindable) and the "Switch project" label across all locales.

* test(app): cover project picker shortcut

---------

Co-authored-by: Mohamed Boudra <boudra.moha@gmail.com>

packages/app/src/i18n/resources/ja.ts

@@ -1847,6 +1847,7 @@ export const ja: TranslationResources = {
         sendMessage: "メッセージを送信",
         queueMessage: "メッセージをキューに追加",
         muteUnmuteVoiceMode: "音声モードのミュートを切り替え",
+        switchProject: "プロジェクトを切り替え",
       },
       helpNotes: {
         showKeyboardShortcuts: