[#944] Differentiate full and partial credit when group is merged (#2089

)

Currently, when viewing individual contributions, full and partial
credit are differentiated with dark and light green colors. However,
this distinction is not applied when the group is merged, potentially
causing confusion for users.

Let's introduce a clear differentiation between full and partial credit
when viewing a merged group.

frontend/src/components/c-segment.vue

@@ -53,7 +53,7 @@ export default defineComponent({
     return {
       isOpen: (this.segment.knownAuthor !== null) || this.segment.lines.length < 5 as boolean,
       canOpen: (this.segment.knownAuthor === null) && this.segment.lines.length > 4 as boolean,
-      transparencyValue: '30' as string,
+      transparencyValue: (this.segment.isFullCredit ? '50' : '20') as string,
     };
   },
   computed: {