feat(ui): cap Dashboard Active and Recent Activity lists at 5 items

Both lists could grow long enough to dominate the viewport (21 queued
downloads was common). Limit each to 5 entries with a "+N more"
affordance: Active shows a "+N more queued" button that deep-links to
/downloads?status=queued, and Recent Activity folds the overflow count
into the existing "View all downloads" button. Seed Downloads.vue's
status filter from the URL query param so the deep-link actually filters
on arrival.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

frontend/src/views/Dashboard.vue

@@ -163,7 +163,7 @@
           <v-card-text>
             <v-list v-if="activeDownloads.length" density="compact">
               <v-list-item
-                v-for="dl in activeDownloads"
+                v-for="dl in visibleActiveDownloads"
                 :key="dl.id"
                 :class="{ 'download-running': dl.status === 'running' }"
               >
@@ -181,6 +181,11 @@
                   </v-chip>
                 </v-list-item-subtitle>
               </v-list-item>
+              <v-list-item v-if="hiddenActiveCount" class="text-caption text-medium-emphasis">
+                <v-btn variant="text" size="small" to="/downloads?status=queued">
+                  +{{ hiddenActiveCount }} more queued
+                </v-btn>
+              </v-list-item>
             </v-list>
             <div v-else class="text-center py-8">
               <v-icon size="48" color="secondary" :style="{ opacity: 0.5 }">mdi-check-circle-outline</v-icon>
@@ -202,7 +207,7 @@
           </v-card-title>
           <v-card-text>
             <v-list v-if="recentActivityGrouped.length">
-              <template v-for="entry in recentActivityGrouped" :key="entry.key">
+              <template v-for="entry in visibleRecentActivity" :key="entry.key">
                 <v-list-item v-if="entry.kind === 'single'">
                   <template v-slot:prepend>
                     <v-icon :color="getStatusColor(entry.download.status)">
@@ -251,7 +256,9 @@
             </div>
           </v-card-text>
           <v-card-actions>
-            <v-btn variant="text" to="/downloads">View All Downloads</v-btn>
+            <v-btn variant="text" to="/downloads">
+              {{ hiddenRecentCount ? `View all downloads (+${hiddenRecentCount} more)` : 'View all downloads' }}
+            </v-btn>
           </v-card-actions>
         </v-card>
       </v-col>
@@ -415,6 +422,16 @@ const recentActivityGrouped = computed(() => {
   return out
 })
 
+const DASHBOARD_LIST_LIMIT = 5
+const visibleActiveDownloads = computed(() => activeDownloads.value.slice(0, DASHBOARD_LIST_LIMIT))
+const hiddenActiveCount = computed(() =>
+  Math.max(0, activeDownloads.value.length - DASHBOARD_LIST_LIMIT)
+)
+const visibleRecentActivity = computed(() => recentActivityGrouped.value.slice(0, DASHBOARD_LIST_LIMIT))
+const hiddenRecentCount = computed(() =>
+  Math.max(0, recentActivityGrouped.value.length - DASHBOARD_LIST_LIMIT)
+)
+
 // Read threshold from settings, default 5 if unset or invalid
 const failureThreshold = computed(() => {
   const n = Number(settingsStore.settings['dashboard.failure_threshold'])

frontend/src/views/Downloads.vue

@@ -360,15 +360,18 @@
 
 <script setup>
 import { ref, computed, onMounted, onUnmounted, watch } from 'vue'
+import { useRoute } from 'vue-router'
 import { useDownloadsStore } from '../stores/downloads'
 import { useSourcesStore } from '../stores/sources'
 import { useNotificationStore } from '../stores/notifications'
 
+const route = useRoute()
 const downloadsStore = useDownloadsStore()
 const sourcesStore = useSourcesStore()
 const notifications = useNotificationStore()
 
-const filterStatus = ref(null)
+const VALID_STATUSES = ['queued', 'running', 'completed', 'failed', 'skipped']
+const filterStatus = ref(VALID_STATUSES.includes(route.query.status) ? route.query.status : null)
 const filterSourceId = ref(null)
 const filterFromDate = ref(null)
 const filterToDate = ref(null)