Add weekly pace indicator

[Remedy92]

Summary

This adds a simple weekly pace hint so users can quickly tell if they’re trending low/on‑track/high for the week. It shows a short label plus the delta and a relative run‑out estimate when it’s safe to compute.

User impact

• In the menu card (and text menu), the Weekly section now includes a single line like:
  • "Pace: Low (-3%) · Lasts to reset"
  • "Pace: On track (+1%) · 2d left"
  • "Pace: High (+8%) · 3d left"
• Only shown for Codex/Claude weekly usage.

Behavior details

• Uses weekly reset time and window length to estimate expected usage by now and compare to actual usage.
• Shows relative ETA if the current pace would run out before reset; otherwise shows "Lasts to reset".
• Hides the pace line if reset timing is missing or inconsistent (avoids misleading output).

Testing

• swiftformat Sources Tests
• swiftlint --strict
• COREPACK_ENABLE_AUTO_PIN=0 pnpm check

Screenshots

[steipete]

Please add some text and screenshots :)

[Remedy92]

Please add some text and screenshots :)

Done. Thank you for reviewing :)

[PhilETaylor]

my pace disappeared overnight - was the claude outage/change overnight at fault, or the fact my weekly quote renewed?

[PhilETaylor]

Nevermind Claude told me....

  Here's what's happening:

  Your weekly window resets in 6d 20h, which means only about 4 hours have elapsed since it started.

  - 4 hours / 168 hours (1 week) = ~2.4% of the window elapsed
  - The threshold to show pace is 3%

  Since less than 3% of the weekly window has passed, pace is hidden because there isn't enough data yet to make a meaningful pace calculation.

  When will pace appear? Once ~5 hours have elapsed into the weekly window (when expected usage reaches 3%).

  This is by design - showing pace when the window just started would give misleading information because small variations would appear as huge percentage swings.```