Send button transparent unless hovered

[depips]

Steps to reproduce

1. Open Mailbox
2. Hit "new message"
3. Enter at least 1 recipient

Expected behavior

"Send" button remains visible

Actual behavior

"Send" button becomes transparent It becomes visible again when hovered (requires mouse)

Mail app version

1.13.6

Mailserver or service

No response

Operating system

No response

PHP engine version

No response

Web server

No response

Database

No response

Additional info

As long as the button is disabled (no recipient), it has var(--color-primary-element) as background-color through core server.css Adding a recipient removes the disabled pseudo-class, making it inherit "transparent" background-color from Composer.Vue Hovering sets var(--color-primary-element-light) as background-color through core server.css

Suggested fix: Add suitable color or background-color to .send-button