feat: LINE QR Login as Primary login

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Issues

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1 issue already resolved

• LineQRLogin.StartWithOverride copies only ExistingLogin, ExistingMetadata and Certificate into the wrapped LineEmailLogin, so finishLogin builds new metadata with empty Email/Password. A user who re-authenticates via QR loses stored credentials, and tryLogin then fails with "no stored credentials available for re-login". (fixed by commit aa35008)
  _{Found by Indent Review Agent}

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Passed (1)

• Indent Review Agent · No new issues in the QR re-login commit; earlier finding remains fixed.

Full results

Indent Review Agent

• Summary: No new issues in the QR re-login commit; earlier finding remains fixed.
• Last ran on commit: 22dca1a9
• Latest result

  {
    "summary": "No new issues in the QR re-login commit; earlier finding remains fixed.",
    "findings": []
  }