Fix switching users on client, properly changes stdiod config

[dimitriosGX]

Summary by cubic

Ensure switching users and signing out correctly reconfigures the stdiod daemon so it doesn't keep tunneling under the previous account. Adds safe teardown on sign-out and reprovisions the daemon on account switch.

• Bug Fixes
  • On in-app sign-out (setup:reset), unload stdiod with purge:false to stop the tunnel but keep config.toml; errors are swallowed so sign-out never blocks.
  • On account switch, re-point stdiod to the active account if installed and credentials/backend exist; otherwise stop it. No-op if not installed; skipped under EDISON_DRY_RUN=1.
  • Wire-ups in IPC: call the teardown on sign-out and reprovision after switching accounts. Added unit tests covering all paths.

^{Written for commit e45f0a5. Summary will update on new commits.}

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[cubic-dev-ai]

All reported issues were addressed across 3 files

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