fix(quota): show seconds in reset countdown

[SaladDay]

Summary

• show whole seconds while a positive quota reset countdown is below one minute
• preserve the existing minute/hour formatting and localized expired state
• cover subsecond, 60-second, zero, negative, and localization boundaries

Scope

This PR only changes quota reset duration formatting and its regression coverage. It does not implement the weekly header proposed in #248 or change table layout, API behavior, JSON output, or quiet output.

Verification

• Full test suite: 510 passed, 0 failed
• TypeScript typecheck passed
• ESLint passed with one pre-existing warning in test/sdk/speech.test.ts
• Development build passed

Closes #254

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