fix : replace MalioButton with styled native button in export drawer

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/components/time-tracking/TimeTrackingExportDrawer.vue

@@ -100,13 +100,13 @@
             </div>
 
             <!-- Export button -->
-            <MalioButton
-                :label="$t('timeEntries.export')"
-                icon-name="mdi:download"
-                icon-position="left"
-                button-class="w-full"
+            <button
+                class="flex w-full items-center justify-center gap-2 rounded-md bg-primary-500 px-4 py-3 text-sm font-semibold text-white hover:bg-primary-600 transition"
                 @click="doExport"
-            />
+            >
+                <Icon name="mdi:download" size="18" />
+                {{ $t('timeEntries.export') }}
+            </button>
         </div>
     </MalioDrawer>
 </template>