fix: repair feedback screenshot and list layouts

frontend/src/features/feedback/components/FeedbackSubmissionDialog.vue

@@ -135,8 +135,11 @@
         try {
             await nextTick();
             const target = document.querySelector('.shell-container') ?? document.body;
+            const appBackground = getComputedStyle(document.documentElement)
+                .getPropertyValue('--app-color-on-primary')
+                .trim() || '#ffffff';
             const canvas = await html2canvas(target, {
-                backgroundColor: 'var(--app-color-on-primary)',
+                backgroundColor: appBackground,
                 height: window.innerHeight,
                 ignoreElements: element => element.dataset?.feedbackUi === 'true',
                 scale: Math.min(window.devicePixelRatio || 1, 2),

frontend/src/features/feedback/views/DeveloperFeedbackListView.vue

@@ -214,7 +214,7 @@
             v-else
             class="report-table"
         >
-            <v-btn variant="text" :ripple="false"
+            <button
                 v-for="report in feedbackStore.filteredReports"
                 :key="report.id"
                 class="report-row"
@@ -263,7 +263,7 @@
                         />
                     </small>
                 </span>
-            </v-btn>
+            </button>
 
             <div
                 v-if="!feedbackStore.filteredReports.length"

frontend/src/features/feedback/views/MyFeedbackListView.vue

@@ -126,7 +126,7 @@
             v-else
             class="report-list"
         >
-            <v-btn variant="text" :ripple="false"
+            <button
                 v-for="report in feedbackStore.filteredReports"
                 :key="report.id"
                 class="report-row"
@@ -160,7 +160,7 @@
                     <span>{{ t('feedback.review.lastActivity') }}</span>
                     <strong>{{ formatDate(report.lastActivityAt) }}</strong>
                 </span>
-            </v-btn>
+            </button>
 
             <div
                 v-if="!feedbackStore.filteredReports.length"