color-primary-element-lighter CSS variable is undefined

[nickvergessen]

        nextcloud-vue  (3 usages found)
            src/components/NcButton  (2 usages found)
                NcButton.vue  (2 usages found)
                    442 background-color: var(--color-primary-element-lighter);
                    451 background-color: var(--color-primary-element-lighter);
            src/components/NcCounterBubble  (1 usage found)
                NcCounterBubble.vue  (1 usage found)
                    91 background-color: var(--color-primary-element-lighter, var(--color-primary-element-light));

Was removed with

• Fix primary element color variables nextcloud/server#33641
• Remove non existing lighter colour nextcloud/server#33946
• Remove last occurance of "color-primary-element-lighter" nextcloud/server#34165

[nickvergessen]

cc @GretaD and idea for a replacement?