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/zh-CN.ts

@@ -1810,6 +1810,7 @@ export const zhCN: TranslationResources = {
         sendMessage: "发送消息",
         queueMessage: "消息排队",
         muteUnmuteVoiceMode: "静音/取消静音语音模式",
+        switchProject: "切换项目",
       },
       helpNotes: {
         showKeyboardShortcuts: "焦点不在文本输入框或终端内时可用。",