refactor(ssr): Phase 6b — migrate Transaction Rule wizard onto the session engine; de-cursor

Proves the Phase-6a wizard engine against a real 2-step modal: the Transaction
Rule wizard (edit step + read-only test/preview step) now runs on wizard2 /
wizard-state, fully de-cursored.

What changed
- Wizard machinery removed: deleted the EditModal / TestModal /
  TransactionRuleWizard defrecords (mm/ModalWizardStep + LinearModalWizard),
  MultiStepFormState, the EDN snapshot, and the step-params[...] prefix. Replaced
  with a data-driven `transaction-rule-wizard-config` (two steps + init-fn +
  done-fn) driven by the engine.
- De-cursored the whole edit form (82 fc/ refs -> 0): every field reads explicit
  data + path->name2; errors via a bound *errors* / ferr. The account row's Alpine
  cross-field dispatch wiring (clientId -> accountId -> location) is preserved
  verbatim — only the data plumbing moved off the cursor.
- The test step's :render reads :all-data (the engine's get-all), so the
  formtools "combine at the end" mechanism feeds the preview table.
- Routes 4 -> 2: open-rule-wizard (new + edit), save-step (every transition via the
  engine's `direction` field). The dedicated `navigate` route is deleted.
- decode-rule-form select-keys to the schema's known keys so the engine's nav
  fields (wizard-id/current-step/direction) don't leak into the upserted entity.

Scorecard (admin/transaction_rules.clj): fc/ 82->0, mm/ 20->0, defrecords 3->0,
LOC 1000->964, routes 4->2.

Scope note: the de-cursored edit step keeps com/* Hiccup leaf components (not yet
sc/* Selmer); the value here was removing fc/ + mm/ and proving the engine, not
re-templating the conditional/Alpine-cross-field layout. Hiccup-in-render is a
documented partial; the com/ -> sc/ swap is a mechanical follow-up.

Verification: rule spec 4/4 (new + edit dialogs, advance-to-test preview, save);
full Playwright suite 55/55; cljfmt clean. Skill fed: scorecard row + narrative
(engine's first real modal; generalizes for a one-data-step wizard); gotchas
(strip engine nav fields in decode, new-row temp-id, direction-button nav).

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

e2e/transaction-rule.spec.ts

@@ -52,7 +52,7 @@ async function addAccount(page: any, accountId: string) {
 }
 
 async function fillDescription(page: any, desc: string) {
-  await page.locator('#wizard-form input[name*="[transaction-rule/description]"]').first().fill(desc);
+  await page.locator('#wizard-form input[name="transaction-rule/description"]').first().fill(desc);
 }
 
 // Approval status is required to advance/save; the radio-card's first option is "Approved".
@@ -89,7 +89,7 @@ test.describe('Transaction Rule wizard (characterization)', () => {
   test('Edit dialog pre-populates the seeded rule', async ({ page }) => {
     await navigateToRules(page);
     await openEditDialog(page);
-    const desc = page.locator('#wizard-form input[name*="[transaction-rule/description]"]').first();
+    const desc = page.locator('#wizard-form input[name="transaction-rule/description"]').first();
     await expect(desc).toHaveValue('ZZRULEMATCH');
   });
 
@@ -116,8 +116,8 @@ test.describe('Transaction Rule wizard (characterization)', () => {
     await addAccount(page, info.accounts['test-account'].toString());
     await selectApproved(page);
     await clickTest(page);
-    // Save from the test step
-    await page.locator('#wizard-form button:has-text("Save"), #wizard-form button[type="submit"]').first().click();
+    // Save from the test step (the precise Save button, not Back which is also submit)
+    await page.locator('#wizard-form button:has-text("Save")').first().click();
     await page.waitForTimeout(1000);
     // modal closed + a new rule row added
     await expect(page.locator('#wizard-form')).toBeHidden();