fix(swift-ios): refresh passive threads sooner

[saphid]

Home previously refreshed non-selected SwiftUI environments every 20 seconds. This change polls them every 5 seconds while work is active or changes arrive, and every 10 seconds while idle. Failed environments retry after 20 seconds without slowing healthy peers.

Rebased onto t3code/rebuild-mobile-app-swift at 614a7b672a. The current thread sync handling and multi-environment test fixtures are preserved.

Validation: 27 focused native tests passed on 8d17864a88ac56732dc17278a3c82946b8b06391, covering passive refresh and multi-environment behavior. Range review and git diff --check passed.

Earlier evidence

Original Dev 55 phone report. This report belongs to the earlier revision and was not recaptured for this rebase.

Tracking: native work item 237.

Modernized and fixed with GPT-6 in Codex.

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Cursor Bugbot has reviewed your changes using high effort and found 1 potential issue.

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[macroscopeapp]

Approvability

Verdict: Not approved

Macroscope's review found this PR not approvable — The production Swift iOS default refresh cadence changes from 20 seconds to 5 seconds, alongside adaptive polling and failure backoff that alter passive thread freshness and background HTTP traffic. These customer-visible runtime and default changes warrant human review despite the added deterministic tests.

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