Trip currency, expense currency and display currency answer three different
questions, and nothing said so: the trip currency wasn't documented at all (it
had no picker until now), and Budget-Tracking conflated the other two while
still claiming 47 currencies and a display currency that always came from
Settings.
Add a Currencies page as the one place they're defined together — the trip
currency as the accounting base, the expense currency as the receipt with its
rate frozen at entry, the display currency as presentation-only — plus what
happens when a trip's currency changes, which currency a public share renders
in, and what belongs to the Costs addon versus the trip itself.
Rewrite Budget-Tracking's currency section against it, document the currency
field in Creating-a-Trip and the display currency in Display-Settings (which
never mentioned it), and note the sharer-or-trip fallback in Public-Share-Links.
Adds the complete TREK documentation wiki covering installation,
trip planning, admin panel, MCP/AI integration, addons, and operations.
Also fixes encrypt-at-rest gaps: mapbox_access_token, Synology
credentials, per-user webhook/ntfy tokens, and photo passphrases
are now rotated by migrate-encryption.ts and stored encrypted via
settingsService.
Dieter Blomme