fix: keep manual refresh responsive

[Yuxin-Qiao]

Summary

• stop overview manual refreshes from forcing the foreground token-cost/OpenAI enrichment path
• keep fixed refresh timers anchored to scheduled tick times instead of refresh completion time
• add regressions for non-blocking manual refresh completion and fixed-cadence advancement

Root cause

The overview manual refresh path called the store with forceTokenUsage: true, which made the visible refresh wait for token/cost history, credits, OpenAI web enrichment, and possible Codex follow-up work. Separately, the fixed-frequency timer slept for the configured interval only after each refresh completed, so slow provider work permanently stretched a 2-minute cadence into refresh duration plus 2 minutes.

Impact

Manual overview refresh now finishes when provider quota/status refresh work completes, while token/cost enrichment continues in the existing background path. Fixed-frequency refreshes keep their intended cadence without starting overlapping catch-up refreshes if one tick runs long.

Test

• git diff --check
• swift test --filter 'AdaptiveRefreshTimerTests|StatusMenuPersistentRefreshTests'
• swift test --filter 'UsageStoreManualTokenRefreshTests|StatusMenuMergedOverviewRefreshTests'
• swift test --filter 'StatusMenuManualRefreshEnrichmentTests|StatusMenuPersistentRefreshTests'

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