refactor(ssr): remove the EDN snapshot round-trip; transaction edit is a plain form (heuristic 2)

The wizard serialized the whole accumulating form state into a `snapshot` hidden field
(pr-str EDN + custom readers), decoded it every request, and merged step-params back in.
For this single-step modal the snapshot is pure redundancy: every value is either in the
entity or the live posted form. Remove it:

- render: EditWizard.render-wizard renders a plain form -- no snapshot / edit-path /
  current-step hidden fields; a single `db/id` hidden rides in the form instead.
- middleware: wrap-derive-state rebuilds :multi-form-state per request from the entity
  (loaded by the db/id hidden) overlaid with the live step-params, replacing
  wrap-init-multi-form-state + wrap-entity. The ~34 :snapshot reads are unchanged --
  :snapshot is now a derived map, not a round-tripped blob.
- editable fields (accounts, vendor, memo, approval, action, mode, amount-mode) come ONLY
  from the posted form (absent = cleared) so removing all account rows doesn't resurrect
  the entity's persisted accounts; only entity-only fields (db/id, client, amount, ...)
  come from the entity.
- delete the dead initial-edit-wizard-state and render-account-grid-body.
- e2e: make removeAllAccounts re-query each iteration (whole-form swaps stale a captured
  row index) and restore the percentage test to type-then-add ordering.

Scorecard: snapshot EDN round-trip + custom readers + merge-multi-form-state -> gone
(snapshot-field renders 0). Verified on a fresh server: full suite 38 pass / 1 unrelated
fail, swap 6/6, transaction-edit 8/8 -- same green as before, snapshot removed.

.claude/skills/ssr-form-migration/reference/scorecard.md

@@ -39,7 +39,7 @@ Each migration appends one row (after-numbers), referencing the before in the di
 | Phase | Modal | LOC | Routes | no-cursor twins | faked roots | snapshot merges | OOB | mixed hx- | cookbook reused / added |
 |-------|-------|-----|--------|-----------------|-------------|-----------------|-----|-----------|-------------------------|
 | 1 (baseline) | Transaction Edit `transaction/edit.clj` | 1608 | ~12 | 1 | 2 | ~75 | 0 | 8 | — / seeded 7 entries |
-| 2 (in progress) | Transaction Edit `transaction/edit.clj` | 1545 | **~5** | **0** | **0** | ~75 | 0 | 8 | — / 0 |
+| 2 | Transaction Edit `transaction/edit.clj` | 1584 | **~5** | **0** | **0** | **0 round-trip** | 0 | 8 | — / 0 |
 
 > **Phase 2 progress.** Achieved with parity held (swap spec **6/6**, transaction-edit
 > spec **8/8**, full suite **38 pass / 1 unrelated fail / 0 skip**, up from 30/2/7):