test(ios): await clear-all completion state

[AnganSamadder]

Summary

• replace fixed Task.yield polling with an awaited clear-all completion observation
• cover both clear-all success and failure fixtures with the deterministic helper
• prepare version 0.1.16 (build 131)

Failure evidence

• post-merge CI run 32860441155 failed AppStoreTests.testClearAllUserData_keepsFailureVisibleAndStopsRemainingCloudWork after the fixed-yield poll raced the MainActor completion task
• the product path remained green under hosted ASan, hosted TSan, local standard, and Xcode Cloud

Verification

• targeted failing selector: 20/20 iterations passed
• AppStoreTests: 79/79 passed
• full standard iOS: 2790/2790 passed, 0 skipped
• bun run ci: passed, including 573/573 backend tests

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Project	Deployment	Actions	Updated (UTC)
payback	Ready	Preview	Aug 25, 2026 3:52pm

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