[Feature Request] Show time elapsed and reset countdown in /usage rate limit display

Bug Description
Feature Request: Show time elapsed in rate limit windows

The /usage command shows token consumption but not how much time has passed in the rate limit windows.

Requested enhancement:
5h window: 1,234 tokens (12%) | resets in 2h 15m (55% elapsed)
Weekly: 50,000 tokens (25%) | resets in 4d 12h (36% elapsed)

Why this helps:

• Users can plan work sessions around reset times
• Knowing "55% of time elapsed but only 12% of quota used" = safe to continue
• Knowing "20% of time elapsed but 80% of quota used" = maybe wait for reset
• Removes guesswork about when limits refresh

Environment Info

• Platform: linux
• Terminal: vte-based
• Version: 2.1.19
• Feedback ID: f0e654d9-9ea5-4223-af6e-fa351a3631b4

Errors

[{"error":"Error: ENOENT: no such file or directory, scandir '/etc/claude-code/.claude/skills'\n    at readdirSync (unknown)\n    at <anonymous> (/$bunfs/root/claude:12:1903)\n    at pJ (/$bunfs/root/claude:11:35427)\n    at readdirSync (/$bunfs/root/claude:12:1864)\n    at XY$ (/$bunfs/root/claude:2213:380)\n    at XY$ (/$bunfs/root/claude:2213:1350)\n    at <anonymous> (/$bunfs/root/claude:2213:4440)\n    at <anonymous> (/$bunfs/root/claude:2213:5171)\n    at A (/$bunfs/root/claude:11:7251)\n    at Z71 (/$bunfs/root/claude:4860:4342)","timestamp":"2026-01-26T02:28…

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