[UX] /usage reset times should include the date, not just the time

Problem

The /usage screen shows reset times like:

Resets 12:59pm (America/Los_Angeles)

When the displayed time has already passed today, it's ambiguous whether the reset is today or tomorrow (or some other day for weekly resets). The user has to guess.

Suggested Fix

Include the date in the reset time display:

Resets Feb 26, 12:59pm (America/Los_Angeles)

Or use relative phrasing when the reset is soon:

Resets tomorrow at 12:59pm (America/Los_Angeles)
Resets in 19 hours (Feb 26, 12:59pm)

This would remove ambiguity for all reset lines — session, weekly (all models), weekly (Sonnet), and extra usage.

Current Behavior

• /usage shows only time + timezone for session and weekly resets
• The "Extra usage" line does include a date (e.g., "Resets Mar 1") — so there's already precedent for showing dates
• When the displayed time has already passed today, users must assume it means tomorrow

Expected Behavior

All reset lines should include the date, consistent with how "Extra usage" already displays it.