Usage: add a Today preset starting at local midnight

[AndreiShenets]

ℹ️ Written by GPT-6.1 Sol on behalf of Andrei Shenets

Problem

Usage offers a rolling Past 24h window, but no current-calendar-day preset. Past 24h includes yesterday's activity, so it does not answer “How much have I used today, since midnight?”

Proposal

• Add Today immediately before Past 24h, keeping the rolling window available.
• Show today's costs, tokens, and breakdowns from midnight in the viewer's local timezone, including when connected to a remote environment.
• Use the same calendar-day filtering on web, desktop, and mobile. This should handle 23-hour and 25-hour DST days without treating today as a rolling 24-hour window.
• Persist the selection alongside the existing web/desktop usage preferences and rebuild the current-day window when refreshed after midnight.
• Keep numbered shortcuts in visual order: mod+shift+1 Today, 2 Past 24h, 3 7 days, 4 30 days, 5 90 days. This intentionally changes the existing period shortcut defaults and needs approval too.

The smallest implementation uses the existing daily aggregation for Today; an hourly chart is not required for the requested totals. No new provider integration or usage API is needed.

Existing work

Earlier PR #12076 proposed the same Today preset with hourly buckets. It was closed with a request for test results and before/after UI captures, not merged. I am not treating that feedback as product approval.

I have a reference implementation in my fork. Focused tests cover timezone/calendar-day boundaries, DST days, preference persistence, refresh after midnight, both web period controls, and shortcut order. Scoped typechecks and lint pass. Browser/native visual verification and before/after captures have not been done; those would be needed for an upstream PR.

Decision requested

Would you accept a Today preset with this scope, including the shortcut renumbering? If so, I can prepare a focused PR with the observed test commands/results and the required UI evidence. This discussion asks for direction and scope first, per CONTRIBUTING.md.

Example