Remove Upcoming/Past tabs from activities feed

Replace tabbed layout with a single continuous feed matching p'a semana
style. Temporal filter pills already handle time-based filtering.

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

src/modules/activities/views/ActivitiesPage.vue

@@ -2,7 +2,6 @@
 import { onMounted, ref } from 'vue'
 import { useRouter } from 'vue-router'
 import { useI18n } from 'vue-i18n'
-import { Tabs, TabsContent, TabsList, TabsTrigger } from '@/components/ui/tabs'
 import { Button } from '@/components/ui/button'
 import { Input } from '@/components/ui/input'
 import {
@@ -28,7 +27,6 @@ const showCreateDialog = ref(false)
 
 const {
   activities,
-  pastActivities,
   isLoading,
   error,
   temporal,
@@ -133,39 +131,12 @@ function handleRefresh() {
       {{ error }}
     </div>
 
-    <!-- Tabs: Upcoming / Past -->
+    <!-- Activity feed -->
-    <Tabs default-value="upcoming" class="w-full">
-      <TabsList class="grid w-full grid-cols-2 mb-4">
-        <TabsTrigger value="upcoming">
-          Upcoming
-          <span v-if="activities.length > 0" class="ml-1.5 text-xs opacity-60">
-            ({{ activities.length }})
-          </span>
-        </TabsTrigger>
-        <TabsTrigger value="past">
-          Past
-          <span v-if="pastActivities.length > 0" class="ml-1.5 text-xs opacity-60">
-            ({{ pastActivities.length }})
-          </span>
-        </TabsTrigger>
-      </TabsList>
-
-      <TabsContent value="upcoming">
     <ActivityList
       :activities="activities"
       :is-loading="isLoading"
       @select="handleSelectActivity"
     />
-      </TabsContent>
-
-      <TabsContent value="past">
-        <ActivityList
-          :activities="pastActivities"
-          :is-loading="isLoading"
-          @select="handleSelectActivity"
-        />
-      </TabsContent>
-    </Tabs>
 
     <!-- Create Activity Dialog -->
     <CreateActivityDialog