Whole-form htmx + Alpine morph for transaction edit

Re-render the entire #wizard-form on each field edit and swap with
hx-swap="morph" so the focused input keeps focus/caret/value while typing.

- Field-level routes return the full form and target #wizard-form
- Key state-owning wrappers (account rows, simple-mode wrapper, vendor
  typeahead) so server-driven value changes re-init across the morph
- Guard tippy/$refs access in typeahead against stale post-morph state
- Round-trip simple/advanced mode via step-params[mode]
- Add e2e/transaction-edit-morph.spec.ts covering focus/caret preservation,
  vendor->account population, and repeated vendor changes
- Seed a second vendor/account for test isolation

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

src/cljc/auto_ap/routes/transactions.cljc

@@ -33,7 +33,9 @@
              "/account-total" ::account-total
              "/account-balance" ::account-balance
              "/toggle-amount-mode" ::toggle-amount-mode
+             "/edit-form-changed" ::edit-form-changed
              "/edit-wizard-new-account" ::edit-wizard-new-account
+             "/edit-wizard-remove-account" ::edit-wizard-remove-account
              "/edit-wizard-toggle-mode" ::edit-wizard-toggle-mode
              "/match-payment" ::link-payment
              "/match-autopay-invoices" ::link-autopay-invoices