Bryce 482b4802ff Make swaps precise: drop no-op requests, swap only the affected field ...

Refine per-trigger granularity now that the swap target is explicit:

- Memo issues no request at all -- it affects nothing else, so its value just
  rides along in the form and is merged into the snapshot on save. (Changing the
  Location *value* likewise issues no request -- it never did; that cell's request
  is the account->location dependency.)
- Account select swaps only that row's Location cell (#account-location-<index> /
  #simple-account-location) instead of the whole form. Selecting an account only
  affects the valid Location options (computed from the posted account-id), so a
  precise cell swap is safe -- no snapshot dependency.

Account-structural changes (vendor, add/remove row, mode toggle, $/% radio) keep
swapping the whole form: their accounts+amount-mode state is interdependent and
round-trips through the single form-level snapshot hidden field, so a whole-form
swap is what keeps it consistent with zero OOB.

Update the memo test to assert it fires no request and keeps its value/caret.
Full e2e suite: 27 passed / 2 failed (same pre-existing, unrelated failures).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

2026-06-01 20:12:22 -07:00

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