fix(auth, web): connect Auth emulator after reload when sessionStorage already has the origin

[SelaseKay]

Description

On web, useAuthEmulator skipped connectAuthEmulator when sessionStorage already had the emulator origin from a previous page load. After a full reload the JS Auth instance is new and still points at production, so that skip sent traffic to prod (especially on 127.0.0.1, where plugin init never reconnected).

Skip only when this JS Auth instance is already on the requested origin (emulatorConfig). Also re-apply the persisted origin on 127.0.0.1 / [::1] at plugin init, not just localhost.

Related Issues

• Fixes [FirebaseAuth]: Reopen: Emulator in development doesn't work after logged in / Loading use from session storage.. #18689

Checklist

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• My PR includes unit or integration tests for all changed/updated/fixed behaviors (See Contributor Guide).
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• I updated/added relevant documentation (doc comments with ///).
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Breaking Change

• Yes, this is a breaking change.
• No, this is not a breaking change.

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