Fix RouterView instance registration under HMR (Options API `beforeRouteUpdate`)#2545

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dhyun2:fix/hmr-beforeRouteUpdate-options-api

Commits on Aug 21, 2025

fix(router): register instance on mount; make Options API beforeRouteUpdate work after HMR (#2500)
dhyun2
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test(hmr): return proper WatchStopHandle from mocked watch (no-op fn)
dhyun2
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