feat(transaction): add support for file attachments using Active Storage (#713)

* feat(transaction): add support for file attachments using Active Storage

* feat(attachments): implement transaction attachments with upload, show, and delete functionality

* feat(attachments): enhance attachment upload functionality to support multiple files and improved error handling

* feat(attachments): add attachment upload form and display functionality in transaction views

* feat(attachments): implement attachment validation for count, size, and content type; enhance upload form with validation hints

* fix(attachments): use correct UI components

* feat(attachments): Implement Turbo Stream responses for creating and deleting transaction attachments.

* fix(attachments): include auth in activestorage controller

* test(attachments): add test coverage for turbostream and auth

* feat(attachments): extract strings to i18n

* fix(attachments): ensure only newly added attachments are purged when transaction validation fails.

* fix(attachments): validate attachment params

* refactor(attachments): use stimulus declarative actions

* fix(attachments): add auth for other representations

* refactor(attachments): use Browse component for attachment uploads

* fix(attachments): reject empty values on attachment upload

* fix(attachments): hide the upload form if reached max uploads

* fix(attachments): correctly purge only newly added attachments on upload failure

* fix(attachments): ensure attachment count limit is respected within a transaction lock

* fix(attachments): update attachment parameter handling to avoid `ParameterMissing` errors.

* fix(components): adjust icon_only logic for buttonish

---------

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

config/locales/models/transaction/en.yml

@@ -0,0 +1,11 @@
+---
+en:
+  activerecord:
+    errors:
+      models:
+        transaction:
+          attributes:
+            attachments:
+              too_many: "cannot exceed %{max} files per transaction"
+              too_large: "file %{index} is too large (maximum %{max_mb}MB)"
+              invalid_format: "file %{index} has unsupported format (%{file_format})"