fix(mobile): import the handoff module once in its own test

My round-2 fold added `WRAPPED_HREF_MEMBERS` as a second import of
`./route-handoff.web`, which `import(no-duplicates)` fails in the focused-plugins
pass of the changed-code gate. Joined to the existing import below the mocks,
which is where an import of the module under test has to sit in this file.

Found by running the changed-code gate rather than by review: mobile tsc, whole
tree oxlint and the suite were all green with it.

Claude-Session: https://claude.ai/code/session_01JNnE9qzUZMMnqpZWCqM3nb

mobile/src/navigation/route-handoff.web.test.tsx

@@ -9,7 +9,6 @@ import {
 import { createShellPageClient } from '../mobile-web-shell/bridge/page-bootstrap'
 import type { BridgeRpcClient } from '../mobile-web-shell/bridge/bridge-rpc-client'
 import type { RouteHandoff } from './route-handoff'
-import { WRAPPED_HREF_MEMBERS } from './route-handoff.web'
 
 const router = vi.hoisted(() => ({
   push: vi.fn(),
@@ -37,7 +36,7 @@ vi.mock('../transport/host-client-hooks', () => ({
 }))
 
 import { RpcClientProvider } from '../transport/client-context.web'
-import { useRouteHandoff } from './route-handoff.web'
+import { useRouteHandoff, WRAPPED_HREF_MEMBERS } from './route-handoff.web'
 
 const INIT = {
   v: BRIDGE_PROTOCOL_VERSION,