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/keyboard/keyboard-action-dispatcher.ts

@@ -29,6 +29,7 @@ export type KeyboardActionId =
   | "workspace.terminal.new"
   | "sidebar.toggle.right"
   | "workspace.new"
+  | "workspace.project.pick"
   | "worktree.new"
   | "workspace.archive"
   | "workspace.pin";
@@ -62,6 +63,7 @@ export type KeyboardActionDefinition =
   | { id: "workspace.terminal.new"; scope: KeyboardActionScope }
   | { id: "sidebar.toggle.right"; scope: KeyboardActionScope }
   | { id: "workspace.new"; scope: KeyboardActionScope }
+  | { id: "workspace.project.pick"; scope: KeyboardActionScope }
   | { id: "worktree.new"; scope: KeyboardActionScope }
   | { id: "workspace.archive"; scope: KeyboardActionScope }
   | { id: "workspace.pin"; scope: KeyboardActionScope };