Every Costs write went straight to the API, so offline an expense failed with
"Unknown error" and was lost. Expenses (add, edit, delete, split, paid tick,
reorder) now go through budgetRepo and the mutation queue like places and
packing items: a temporary row offline, held behind an older queued write
online. The replay reads the expense from `item` only, so the split answer
({ members, item }) keeps the local payers and the paid answer ({ member })
never lands in the expense table. An expense linked to a place or booking
created offline is sent with the real id once that one has synced.
Payments are queued without a local row and a hint says they show once
sent; the ledger reads the balances again when the queue is through, and
offline it shows the last balances it read (new Dexie table, v10). Receipts
need an upload, so an offline save with new ones is stopped with a hint.
Refs #2601
Version 6 only adds the driving settings store; dropping the area cache
is version 7. The case name claimed both, so it now names only the new
store and a comment explains where the empty area cache it still checks
comes from.
Each version() of the offline database runs once, on a user's device, when a
new bundle opens what an older one wrote. None of them ran in CI: the v3 blob
cache backfill and the v8 area-fingerprint reset had never been exercised
against an older database.
The new test builds the database as each previous version left it in
fake-indexeddb, seeds a row into every table it had, opens it with the current
schema and checks that the rows survived and that the version did what it is
for. A guard reads the declared versions from offlineDb.ts and fails on a
duplicate, on a version without an upgrade case, or on stores the history
fixture does not reproduce. TrekOfflineDb is exported so the test can open a
named database with it.
Maurice