fix(auth): keep pending on social redirect

[onmax]

Summary

• keep auth action status as pending when social sign-in returns a redirect payload
• add a 10s fallback to settle to success if navigation does not occur
• add regression test for redirect pending behavior in useSignIn

Tests

• pnpm -C /Users/maxi/nuxt/better-auth exec vitest run test/use-signin.test.ts
• pnpm -C /Users/maxi/nuxt/better-auth exec vitest run test/use-user-session.test.ts

[pkg-pr-new]

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npm i https://pkg.pr.new/nuxt-modules/better-auth/@onmax/nuxt-better-auth@182

commit: aa9eaed