Structural rewrite of useSnapshotEditor for N holdings per detailed account,
and switch ALL simple/detailed dispatch from category_kind to the account's
own kind. This is the state/plumbing layer; the full multi-security entry UI
(SecurityPicker, rich sub-rows) lands in #214. Simple accounts behave
identically.
Reducer state shape:
- values: Record<accountId, string> (simple accounts, scalar)
- holdings: Record<accountId, HoldingDraft[]> (detailed accounts, one per title)
HoldingDraft is a string-typed, editable mirror of SnapshotHoldingInput with a
stable client-side rowId for React keys. Actions: ADD_HOLDING / REMOVE_HOLDING /
SET_HOLDING_FIELD (plus existing SET_VALUE/PREFILL/RESET). The legacy priced
scalar path (SET_PRICED_FIELD / pricedValues) is removed: after migration v16
(#211) every former-priced account is kind='detailed' with one holding, so those
accounts flow through the holdings path.
Dispatch:
- LOADED hydrates detailed baskets via listHoldingsBySnapshotLine (edit) keeping
the saved price, or getHoldingsForLatestSnapshot (new) dropping the price
(qty-0 excluded server-side). Simple accounts keep the scalar value path.
- SnapshotLineRow / SnapshotEditor / AccountForm now gate on account.kind, not
category_kind. category.kind survives ONLY as the suggested seed default for a
NEW account in AccountForm.
Save: detailed accounts pass their holdings array into SnapshotLineInput.holdings
(presence marks the line detailed; value = rounded-cent SUM); simple accounts
pass a scalar value with no holdings. Blank holding rows are skipped; a partial
row throws a typed error before any DB mutation.
AccountForm: adds an entry-mode selector (defaulting to the category-mapped
kind). New accounts persist as 'simple' (CreateBalanceAccountInput carries no
kind, and the service is out of this issue's scope); converting a fresh account
to detailed + pivot date is #215. Editing locks the selector for an already-
detailed account (the detailed->simple downgrade is service-guarded).
Tests: 19 new reducer/helper unit tests (pure exports; the project has no
renderHook harness) covering ADD/REMOVE/SET_HOLDING_FIELD, LOADED-vs-PREFILL
hydration (price drop, book_cost), qty-0 already excluded upstream, the
build*Lines save builders, and the dispatch-on-account.kind regression
(detailed account under a 'simple' category).
Resolves#213.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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