fix: resolve e2e test failures for terminal creation and new workspace

Terminal tests (launcher-tab, terminal-performance):
- Terminal creation no longer silently no-ops when workspace metadata
  hasn't hydrated. Early clicks are queued and flushed once the workspace
  directory is ready, with toast feedback.
- Terminal button is disabled while waiting on workspace readiness.
- Removed isFocused gate from ?open= intent consumption in workspace
  layout so deep-linked terminals open reliably on cold startup.

New workspace test:
- New workspace screen now shows a visible Create button even when the
  composer is empty, via new allowEmptySubmit and
  submitButtonAccessibilityLabel props threaded through Composer and
  MessageInput.

packages/app/src/screens/new-workspace-screen.tsx

@@ -290,6 +290,8 @@ export function NewWorkspaceScreen({
             isInputActive={true}
             onSubmitMessage={handleCreateChatAgent}
             hasExternalContent={selectedGithubItem !== null}
+            allowEmptySubmit={true}
+            submitButtonAccessibilityLabel="Create"
             isSubmitLoading={pendingAction === "chat"}
             blurOnSubmit={true}
             value={chatDraft.text}