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.

e2e/transaction-edit.spec.ts

@@ -124,14 +124,13 @@ async function getAccountLocation(page: any, rowIndex: number): Promise<string>
 }
 
 async function removeAllAccounts(page: any) {
-  const accountRows = page.locator('#account-grid-body tbody tr.account-row');
-  const rowCount = await accountRows.count();
-  
-  for (let i = rowCount - 1; i >= 0; i--) {
-    const row = accountRows.nth(i);
-    const removeButton = row.locator('.account-remove-action');
-    await removeButton.click();
-    // Wait for the Alpine.js removal animation (500ms + buffer)
+  // Re-query each iteration: every remove is a whole-form swap that re-renders the rows,
+  // so a row index captured up front goes stale. Click the last remove button until none
+  // remain.
+  for (let guard = 0; guard < 20; guard++) {
+    const removeButtons = page.locator('#account-grid-body .account-remove-action');
+    if (await removeButtons.count() === 0) break;
+    await removeButtons.last().click();
     await page.waitForTimeout(700);
   }
 }