feat(ui): redesign /subscriptions as v-data-table with expandable source rows (GS-style)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

frontend/src/components/subscriptions/SourceRow.vue

@@ -1,25 +1,63 @@
 <template>
-  <div class="fc-source-row">
-    <SourceHealthDot :source="source" :warning-threshold="warningThreshold" />
-    <v-chip size="x-small" variant="tonal" class="fc-source-row__platform">
-      {{ source.platform }}
-    </v-chip>
-    <a :href="source.url" target="_blank" rel="noopener" class="fc-source-row__url">
-      {{ source.url }}
-    </a>
-    <v-switch
-      :model-value="source.enabled"
-      density="compact" hide-details color="accent"
-      @update:model-value="onToggleEnabled"
-    />
-    <v-btn
-      icon="mdi-play" size="x-small" variant="text"
-      :loading="checking"
-      @click="$emit('check', source)"
-    />
-    <v-btn icon="mdi-pencil" size="x-small" variant="text" @click="$emit('edit', source)" />
-    <v-btn icon="mdi-close" size="x-small" variant="text" @click="$emit('remove', source)" />
-  </div>
+  <tr class="fc-source-row">
+    <td class="fc-source-row__health">
+      <SourceHealthDot :source="source" :warning-threshold="warningThreshold" />
+    </td>
+    <td>
+      <v-chip size="x-small" variant="tonal" label>{{ source.platform }}</v-chip>
+    </td>
+    <td class="fc-source-row__url-cell">
+      <a :href="source.url" target="_blank" rel="noopener" class="fc-source-row__url"
+         @click.stop>
+        {{ source.url }}
+      </a>
+    </td>
+    <td>
+      <v-switch
+        :model-value="source.enabled"
+        density="compact" hide-details color="accent"
+        @click.stop
+        @update:model-value="onToggleEnabled"
+      />
+    </td>
+    <td class="fc-source-row__when">
+      {{ formatRelative(source.last_checked_at) }}
+    </td>
+    <td class="fc-source-row__when">
+      {{ formatRelative(source.next_check_at, { future: true }) }}
+    </td>
+    <td>
+      <v-chip
+        v-if="(source.consecutive_failures || 0) > 0"
+        size="x-small" color="error" variant="tonal" label
+      >{{ source.consecutive_failures }}</v-chip>
+      <span v-else class="fc-source-row__zero">0</span>
+    </td>
+    <td class="fc-source-row__actions">
+      <v-btn
+        icon="mdi-play" size="x-small" variant="text"
+        :loading="checking"
+        @click.stop="$emit('check', source)"
+      >
+        <v-icon>mdi-play</v-icon>
+        <v-tooltip activator="parent" location="top">Check now</v-tooltip>
+      </v-btn>
+      <v-btn
+        icon="mdi-pencil" size="x-small" variant="text"
+        @click.stop="$emit('edit', source)"
+      >
+        <v-icon>mdi-pencil</v-icon>
+        <v-tooltip activator="parent" location="top">Edit</v-tooltip>
+      </v-btn>
+      <v-btn
+        icon="mdi-close" size="x-small" variant="text" color="error"
+        @click.stop="$emit('remove', source)"
+      >
+        <v-icon>mdi-close</v-icon>
+        <v-tooltip activator="parent" location="top">Remove</v-tooltip>
+      </v-btn>
+    </td>
+  </tr>
 </template>
 
 <script setup>
@@ -31,25 +69,59 @@ const props = defineProps({
   warningThreshold: { type: Number, default: 5 },
 })
 const emit = defineEmits(['edit', 'remove', 'toggle', 'check'])
+
 function onToggleEnabled(value) {
   emit('toggle', { source: props.source, enabled: value })
 }
+
+function formatRelative(iso, opts = {}) {
+  if (!iso) return opts.future ? '—' : 'Never'
+  const then = new Date(iso).getTime()
+  const now = Date.now()
+  const diff = (then - now) / 1000  // seconds; positive = future, negative = past
+  const abs = Math.abs(diff)
+
+  let body
+  if (abs < 60) body = `${Math.floor(abs)}s`
+  else if (abs < 3600) body = `${Math.floor(abs / 60)}m`
+  else if (abs < 86400) body = `${Math.floor(abs / 3600)}h`
+  else body = `${Math.floor(abs / 86400)}d`
+
+  if (opts.future) return diff <= 0 ? 'imminent' : `in ${body}`
+  return `${body} ago`
+}
 </script>
 
 <style scoped>
-.fc-source-row {
-  display: grid;
-  grid-template-columns: auto 96px 1fr auto auto auto auto;
-  gap: 0.75rem;
-  align-items: center;
-  padding: 0.4rem 0;
+.fc-source-row__health {
+  width: 24px;
+  padding-right: 0 !important;
+}
+.fc-source-row__url-cell {
+  max-width: 400px;
+  overflow: hidden;
 }
 .fc-source-row__url {
   color: rgb(var(--v-theme-on-surface-variant));
   text-decoration: none;
+  display: inline-block;
+  max-width: 100%;
   overflow: hidden;
   text-overflow: ellipsis;
   white-space: nowrap;
 }
 .fc-source-row__url:hover { color: rgb(var(--v-theme-accent)); }
+.fc-source-row__when {
+  color: rgb(var(--v-theme-on-surface-variant));
+  white-space: nowrap;
+  font-variant-numeric: tabular-nums;
+}
+.fc-source-row__zero {
+  color: rgb(var(--v-theme-on-surface-variant));
+  opacity: 0.6;
+}
+.fc-source-row__actions {
+  white-space: nowrap;
+  text-align: right;
+}
 </style>