[web] rename card color family to panel

Summary:
Rename diff. Now that the old panel color family has been renamed to "frame" we can rename the card color family to "panel"

Depends on D10514

Test Plan: flow + confirmed no visual regressions

Reviewers: atul, inka

Reviewed By: atul

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D10515