Feature request: configurable period for menubar status icon (today / week / month)

[CharlieKR]

Summary

The menubar status item currently always shows today's spend. It would be great to let users pick which period the icon displays — e.g. Today / This Week / This Month / Last 6 Months — matching the period segments already present in the popover.

Motivation

• For lighter users, the daily figure is often $0–$1 and not very informative at a glance.
• A monthly running total is more useful for budget awareness against subscription/credit caps.
• The popover already supports period switching, so the data path exists.

Proposed UX

• Add a "Menubar metric" picker in Settings (Today / Week / Month / 6 Months).
• Persist via UserDefaults, e.g. CodeBurnMenubarPeriod ∈ {today, week, month, sixMonths}.
• Optionally suffix the value with the period (e.g. \$42 / mo) when not Today, to avoid confusion.

Workaround today

None via prefs — only CodeBurnMenubarCompact is exposed. Users have to open the popover to see monthly totals.

Thanks for the great tool!