feat(dashboard): replace recent-failures list with platform health bars + strict failing-source table

frontend/src/views/Dashboard.vue

@@ -238,27 +238,59 @@
         <v-card>
           <v-card-title>
             Sources Needing Attention
-            <v-chip class="ml-2" color="error" size="small" v-if="sourcesWithErrors.length">
+            <v-chip class="ml-2" color="error" size="small" v-if="totalFailingCount">
-              {{ sourcesWithErrors.length }}
+              {{ totalFailingCount }}
             </v-chip>
           </v-card-title>
           <v-card-text>
-            <v-table v-if="sourcesWithErrors.length">
+            <!-- Platform Health bars -->
+            <div class="mb-4">
+              <div class="text-caption text-medium-emphasis mb-2">Platform Health</div>
+              <div
+                v-for="row in platformHealth"
+                :key="row.platform"
+                class="d-flex align-center mb-2"
+              >
+                <v-icon :color="getPlatformColor(row.platform)" size="small" class="mr-2">
+                  {{ getPlatformIcon(row.platform) }}
+                </v-icon>
+                <div class="text-body-2 platform-label">{{ row.platform }}</div>
+                <v-progress-linear
+                  :model-value="row.failing > 0 ? (row.failing / row.total) * 100 : 100"
+                  :color="row.failing > 0 ? 'error' : 'success'"
+                  height="12"
+                  rounded
+                  class="mx-3 flex-grow-1"
+                />
+                <div class="text-caption text-medium-emphasis count-label">
+                  {{ row.failing }}/{{ row.total }}
+                </div>
+              </div>
+              <div
+                v-if="!platformHealth.length"
+                class="text-caption text-medium-emphasis text-center py-2"
+              >
+                No enabled sources
+              </div>
+            </div>
+
+            <v-divider class="my-3" />
+
+            <!-- Failing Sources list -->
+            <v-table v-if="failingSources.length" density="compact">
               <thead>
                 <tr>
                   <th>Source</th>
-                  <th>Last Error</th>
+                  <th>Consecutive failures</th>
-                  <th>Last Check</th>
+                  <th>Last check</th>
                   <th>Actions</th>
                 </tr>
               </thead>
               <tbody>
-                <tr v-for="source in sourcesWithErrors" :key="source.id">
+                <tr v-for="source in failingSources" :key="source.id">
                   <td>{{ getSourceLabel(source) }}</td>
                   <td>
-                    <v-chip color="error" size="small">
+                    <v-chip color="error" size="small">{{ source.error_count }}</v-chip>
-                      {{ source.last_error_type || 'failed' }}
-                    </v-chip>
                   </td>
                   <td>{{ formatDate(source.last_check) }}</td>
                   <td>
@@ -270,11 +302,7 @@
                     >
                       Retry
                     </v-btn>
-                    <v-btn
+                    <v-btn size="small" variant="text" to="/subscriptions">
-                      size="small"
-                      variant="text"
-                      to="/subscriptions"
-                    >
                       View
                       <v-tooltip activator="parent">View in Subscriptions</v-tooltip>
                     </v-btn>
@@ -282,10 +310,8 @@
                 </tr>
               </tbody>
             </v-table>
-            <div v-else class="text-center py-8">
+            <div v-else class="text-caption text-medium-emphasis text-center py-3">
-              <v-icon size="48" color="secondary" :style="{ opacity: 0.5 }">mdi-check-all</v-icon>
+              No sources in failing state
-              <div class="text-body-1 mt-2">All sources healthy</div>
-              <div class="text-caption text-medium-emphasis mt-1">No failures in the last 7 days</div>
             </div>
           </v-card-text>
         </v-card>
@@ -357,25 +383,6 @@ const failingSources = computed(() => {
 
 const totalFailingCount = computed(() => failingSources.value.length)
 
-// Sources with recent failures - derived from recent activity
-// Only shows sources where a recent download failed (not cumulative error_count)
-const sourcesWithErrors = computed(() => {
-  const failedDownloads = recentActivity.value.filter(d => d.status === 'failed')
-  // Group by source_id and keep unique sources with their most recent failure
-  const sourceMap = new Map()
-  for (const dl of failedDownloads) {
-    if (dl.source_id && !sourceMap.has(dl.source_id)) {
-      sourceMap.set(dl.source_id, {
-        id: dl.source_id,
-        subscription_name: dl.subscription_name,
-        platform: dl.platform,
-        last_error_type: dl.error_type,
-        last_check: dl.created_at,
-      })
-    }
-  }
-  return Array.from(sourceMap.values()).slice(0, 5)
-})
 
 const failedCount = computed(() => stats.value?.active_failed || 0)
 const activeDownloadsCount = computed(() =>
@@ -640,4 +647,14 @@ async function retrySource(source) {
   0%, 100% { opacity: 1; }
   50%       { opacity: 0.4; }
 }
+
+.platform-label {
+  min-width: 110px;
+  text-transform: capitalize;
+}
+
+.count-label {
+  min-width: 50px;
+  text-align: right;
+}
 </style>