Integrate mobile CSS framework into specific frameworks

What does this MR do?

Moves all parts of mobile CSS framework into the corresponding frameworks to make it easier to maintain the CSS code.

What are the relevant issue numbers?

Closes #54386 (closed)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• [n/a] Documentation created/updated
• [n/a] Tests added for this feature/bug
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• [n/a] Conforms to the database guides
• [n/a] Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.