Add stale SimpleFin account detection and improve unlink cleanup (#574)

* Add stale account detection and handling in SimpleFin setup

- Introduced UI for managing stale accounts during SimpleFin setup.
- Added logic to detect accounts no longer provided by SimpleFin.
- Implemented actions to delete, move transactions, or skip stale accounts.
- Updated `simplefin_items_controller` with stale account processing and handling.
- Enhanced tests to validate stale account scenarios, including detection, deletion, moving transactions, and skipping.

* Update SimpleFin to SimpleFIN in locale file

Signed-off-by: Juan José Mata <jjmata@jjmata.com>

* Silly changes break things ...

Signed-off-by: Juan José Mata <jjmata@jjmata.com>

* Refactor stale account processing and UI handling

- Moved `target_account.sync_later` to execute after commit for proper recalculation of balances.
- Added additional safeguard in JavaScript to check for `moveRadioTarget` before updating target visibility.

* More silly capitalization changes

* Enhance stale account action handling in SimpleFIN setup

- Introduced `permitted_stale_account_actions` to validate and permit nested `stale_account_actions` parameters.
- Updated `complete_account_setup` to use the new method for safer processing.
- Corrected capitalization in SimpleFIN update success and error messages.

* Add error tracking and UI feedback for stale account actions

- Updated `process_stale_account_actions` to track errors for delete and move actions.
- Enhanced UI to display success and error messages for stale account processing.
- Implemented destruction of conflicting transfers during account move to maintain data integrity.

* Refactor transfer destruction and improve SimpleFIN account setup messages

- Updated `simplefin_items_controller` to use `find_each(&:destroy!)` for transfer deletions, ensuring callbacks are invoked.
- Enhanced localization for success messages in account creation to handle singular and plural cases.

---------

Signed-off-by: Juan José Mata <jjmata@jjmata.com>
Co-authored-by: Josh Waldrep <joshua.waldrep5+github@gmail.com>
Co-authored-by: Juan José Mata <jjmata@jjmata.com>

app/javascript/controllers/stale_account_action_controller.js

@@ -0,0 +1,25 @@
+import { Controller } from "@hotwired/stimulus"
+
+export default class extends Controller {
+  static targets = ["moveRadio", "targetSelect"]
+  static values = { accountId: String }
+
+  connect() {
+    this.updateTargetVisibility()
+  }
+
+  updateTargetVisibility() {
+    if (!this.hasTargetSelectTarget || !this.hasMoveRadioTarget) return
+
+    const moveRadio = this.moveRadioTarget
+    const targetSelect = this.targetSelectTarget
+
+    if (moveRadio?.checked) {
+      targetSelect.disabled = false
+      targetSelect.classList.remove("opacity-50", "cursor-not-allowed")
+    } else {
+      targetSelect.disabled = true
+      targetSelect.classList.add("opacity-50", "cursor-not-allowed")
+    }
+  }
+}