This pull request updates the positioning logic and styling for the environment dropdown menu in EnvironmentDropdown.vue to improve its usability and appearance. The main changes focus on more precise dropdown placement, enhanced styling, and improved element references.

Dropdown positioning and element references:

• Added a dropdownRef to reference the dropdown element directly, allowing for accurate calculation of its width and position. [1] [2]
• Updated the calculatePosition function to center the dropdown below the add button, prevent overflow off the screen, and use the dropdown's actual width for calculations.

Styling and usability improvements:

• Enhanced the dropdown menu with a maximum height, vertical scrolling, and improved flexbox layout for better usability with many environments.

Code cleanup:

• Removed the unused computed import from Vue, streamlining the imports.