Support edit Subscription quantity

[tungleduyxyz]

• Add support to update subscription quantity via Kaui #610: Add support to update subscription quantity via Kaui
• Add support to record usage via Kaui #594: Add support to record usage via Kaui

[Copilot]

Pull request overview

This PR adds new subscription UI/actions in Kaui to (1) update subscription quantity and (2) record usage for usage-based subscriptions, plus a “View JSON” modal and improved date/tooling UI to support subscription troubleshooting.

Changes:

• Add edit_quantity / update_quantity controller actions + view and wire them into the subscriptions dropdown menu.
• Add record_usage / create_usage controller actions + view with validation and a menu entry only for usage-based subscriptions.
• Add show_json endpoint + modal UI to view subscription JSON, and update tooltip/popover behavior for ISO date display.

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
test/test_helper.rb	Adds minitest/mock support for new tests.
test/functional/kaui/subscriptions_controller_test.rb	Adds functional coverage for quantity update, usage recording, and JSON endpoint behavior.
Gemfile	Points killbill-client to a specific git branch to support new API calls.
config/routes.rb	Adds routes for quantity, usage, and JSON actions.
app/views/kaui/subscriptions/record_usage.erb	Adds record-usage form UI + client-side validation.
app/views/kaui/subscriptions/edit_quantity.erb	Adds update-quantity form UI.
app/views/kaui/subscriptions/_view_json_modal.html.erb	Adds modal + AJAX logic to fetch and display subscription JSON.
app/views/kaui/subscriptions/_subscriptions_table.html.erb	Adds dropdown entries (Update Quantity / Record Usage / View JSON) and ISO popovers for dates.
app/views/kaui/components/menu_dropdown/_menu_dropdown.html.erb	Allows dropdown items to pass data (and optional HTTP method).
app/models/kaui/usage.rb	Introduces Kaui::Usage model wrapper for usage recording.
app/helpers/kaui/subscription_helper.rb	Adds subscription_has_usage? to detect usage-based subscriptions.
app/controllers/kaui/subscriptions_controller.rb	Implements quantity update, usage record flow, and JSON passthrough action.
app/assets/javascripts/kaui/kaui_override.js	Deprecates old popover impl in favor of tooltip implementation.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.