* fix: guard formatMeta against non-number cost_usd + fix stale docs
formatMeta was doing an unsafe cast to number on cost_usd — if the agent
sends a string or null it would crash with toFixed is not a function.
added a typeof check before calling toFixed.
also updated CONTRIBUTING.md:
- fixed references to drafts-menu.tsx → export-menu.tsx (the actual file)
- fixed scenario list: sale → sales, added missing operations/education/creator/video
* fix: add next/ prefix to CONTRIBUTING.md paths
Semianchuk Vitalii
f2cfd34c43