fix(cost): reconcile usage estimates and billing labels

[willytop8]

Summary

• reconcile Claude OAuth and Claude web extra-usage values so obvious unit mismatches prefer the web billing value
• update Codex and Claude local token-cost pricing/model normalization for current model names
• relabel local token cost as an estimate and rename the latest daily aggregate from "Today" to "Latest day"
• bump the local cost cache version so pricing updates invalidate stale cached totals

Testing

• swift build
• swift test --filter ClaudeOAuthTests
• swift test --filter ClaudeUsageTests
• swift test --filter OpenAIDashboardParserTests
• swift test --filter CostUsageDecodingTests
• swift test --filter CostUsageScannerTests
• swift test --filter CLICostTests
• swift test --filter CostUsagePricingTests
• swift test --filter MenuCardModelTests

Notes

• This PR contains only the single fix commit on top of upstream main.
• The local token-cost numbers remain estimates derived from local logs and published model pricing; they are intentionally separate from dashboard credits and Claude billing values.