Fix FAQ selector search visibility in product BO

[CySSoO]

Motivation

• The FAQ selector search input in the product back office was not visible/fully stretched, making it hard to find and use the search field when selecting FAQs.

Description

• Updated views/css/ever.css to force the Select2 container and search field sizing so the search input is full-width and visible by adding width: 100% rules.
• Added a white background-color to the .select2-selection--multiple area to improve contrast and ensure the input is readable.
• Ensured the container and inline search wrapper .select2-container and .select2-search--inline are set to width: 100% !important so Select2 respects the form layout.

Testing

• No automated tests were executed for this change; changes are purely presentational CSS and were committed without running test suites.

---

Codex Task