feat: add Colombian Peso (COP) currency option

[Andeveling]

Summary

Adds Colombian Peso (COP) to the supported currencies list in src/lib/currency.ts, so accounts targeting Latam markets can configure their default currency without overriding the picker.

What changed

• src/lib/currency.ts — appends { code: "COP", label: "Colombian Peso", symbol: "$" } to CURRENCIES. No other files touched. formatCurrency already routes through Intl.NumberFormat, so the symbol
  and grouping are picked up automatically from the ISO-4217 code; the explicit symbol field is only used by formatCurrencyShort (donut/legend).

Why this might belong upstream despite CONTRIBUTING.md

CONTRIBUTING.md steers "new features" to forks, and a new currency arguably falls there — happy to move it to my fork if the maintainer prefers. The case for considering it upstream:

• It's a one-line data addition, not a feature in the UX sense: no new component, no new screen, no new setting. Just a row in an existing picker.
• CURRENCIES already carries several regional options (INR, JPY, BRL, MXN). COP is the same shape and the same gap to fill.
• Latam is the obvious primary audience for a WhatsApp-first CRM and the upstream copy leans Spanish-first (messages/es-CO.json is shipped).

If the answer is still "belongs in a fork," that's a clean close and I get it.

Test plan

• npm run typecheck clean.
• npm run lint — no new errors.
• npm run build succeeds.
• Manual: open an account settings → currency picker → confirm COP appears and renders as $1.234,56 (es-CO locale) or COP 1,234.56 (en locale) for a sample deal.

Related

None — opening as a probe to test alignment before investing more in this direction.