feat(sync): add Brex provider connections (#1752)

* feat(sync): add Brex provider schema

Adds Brex item and account tables with per-family credentials, scoped upstream account uniqueness, encrypted token storage, and sanitized provider payload columns.

* feat(sync): add Brex provider core

Adds Brex item/account models, provider client and adapter support, family connection helpers, and provider enum registration for read-only Brex cash and card data.

* feat(sync): add Brex import pipeline

Adds Brex account discovery, linked-account sync, cash/card balance processors, transaction import, sanitized metadata handling, and idempotent provider entry processing.

* feat(sync): add Brex connection flows

Adds Mercury-style Brex connection management, explicit item-scoped account selection and linking, settings provider UI, account index visibility, localized copy, and per-item cache handling.

* test(sync): cover Brex provider workflows

Adds targeted coverage for Brex provider requests, adapter config, item/account guards, importer behavior, entry processing, and Mercury-style controller flows.

* fix(sync): align Brex API edge cases

Tightens Brex account fetching against the official card-account response shape, sends transaction start filters as RFC3339 date-times, and keeps provider error bodies out of user-facing messages while expanding provider client guard coverage.

* fix(sync): harden Brex provider integration

Restrict Brex API base URLs to official hosts, tighten account-selection UI behavior, and add tests for invalid credentials, cache scoping, and provider setup edge cases.

* test(sync): avoid Brex secret-shaped fixtures

* refactor(sync): extract Brex account flows

* fix(sync): address Brex provider review feedback

* fix(sync): address Brex review follow-ups

Move remaining Brex review cleanup into focused model behavior, tighten link/setup edge cases, localize summaries, and add regression coverage from CodeRabbit feedback.

Also records the security-review pass as no-findings after diff-scoped inspection and Brakeman validation.

* refactor(sync): split Brex account flow controllers

Route Brex account selection and setup actions through small namespaced controllers while keeping existing URLs and helpers stable.

Business flow remains in BrexItem::AccountFlow; the main Brex item controller now only handles connection CRUD, provider-panel rendering, destroy, and sync.

* fix(sync): address Brex CodeRabbit review

* fix(sync): address Brex follow-up review

* fix(sync): address Brex review follow-ups

* fix(sync): address Brex sync review findings

* fix(sync): polish Brex review copy and errors

* fix(sync): register Brex provider health

* fix(sync): polish Brex bank sync presentation

* fix(sync): address Brex review follow-ups

* fix(sync): tighten Brex setup params

* test(api): stabilize usage rate-limit window

* fix(sync): polish Brex setup flow nits

* fix(sync): harden Brex setup params

* fix(sync): finalize Brex review cleanup

---------

Signed-off-by: Juan José Mata <juanjo.mata@gmail.com>
Co-authored-by: Juan José Mata <juanjo.mata@gmail.com>

app/javascript/controllers/account_type_selector_controller.js

@@ -18,7 +18,8 @@ export default class extends Controller {
     // Hide all subtype selects
     const subtypeSelects = container.querySelectorAll('.subtype-select')
     subtypeSelects.forEach(select => {
-      select.style.display = 'none'
+      select.classList.add('hidden')
+      select.style.removeProperty('display')
       // Clear the name attribute so it doesn't get submitted
       const selectElement = select.querySelector('select')
       if (selectElement) {
@@ -34,7 +35,8 @@ export default class extends Controller {
     // Show the relevant subtype select
     const relevantSubtype = container.querySelector(`[data-type="${selectedType}"]`)
     if (relevantSubtype) {
-      relevantSubtype.style.display = 'block'
+      relevantSubtype.classList.remove('hidden')
+      relevantSubtype.style.removeProperty('display')
       // Re-add the name attribute so it gets submitted
       const selectElement = relevantSubtype.querySelector('select')
       if (selectElement) {
@@ -65,4 +67,4 @@ export default class extends Controller {
       }
     }
   }
-}
+}