refactor(ui): consolidate 7 hand-rolled kebabs into one KebabMenu (DRY pattern sweep)

First pattern-consistency DRY pass (process #594). The overflow kebab was
hand-rolled 7 ways in two divergent activator strategies — Pattern A
(#activator + v-bind) which silently breaks inside the teleported image modal
(#711), and Pattern B (manual v-model + activator=parent + open-on-click=false +
z-index 2400) the modal kebabs needed as a workaround.

New <KebabMenu> (components/common) bakes in the modal-safe strategy
UNIVERSALLY, so every kebab works in modal and non-modal contexts — folding the
latent #711-class bug fix into all five Pattern-A sites. Menu items go in the
default slot; variations (size/variant/location/label/min-width) are props.

Adopted across all 7: TagChip, SuggestionItem, TagCard, SeriesView card,
SeriesManageView, BackupRunsTable, SourceActions. Exhaustiveness (§8b):
mdi-dots-vertical now lives only in KebabMenu. Labeled dropdowns / nav menus /
filter popovers are a different concept and left alone. Seeded the pattern
catalog so new code reuses the primitive. Test: KebabMenu renders slot items +
trigger label/glyph + presentational props.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

frontend/src/components/modal/SuggestionItem.vue

@@ -19,46 +19,29 @@
     >
       Accept
     </v-btn>
-    <!-- Operator-flagged 2026-06-04: the kebab still wasn't opening. The
-         prior `#activator` + `v-bind="props"` path never toggled the menu
-         inside this teleported modal, while v-model-driven overlays (the
-         dialogs in this modal) work fine. So drive the menu explicitly:
-         the button toggles `menuOpen` with @click.stop (also shields any
-         parent), and `activator="parent"` anchors the menu for positioning
-         only — `:open-on-click="false"` keeps Vuetify's activator-click out
-         of it, so there's a single, reliable opener. -->
-    <span class="fc-suggestion__menu-wrap">
-      <v-btn
-        class="fc-suggestion__menu"
-        icon="mdi-dots-vertical" size="small"
-        variant="outlined" density="compact"
-        :aria-label="`More actions for ${suggestion.display_name}`"
-        @click.stop="menuOpen = !menuOpen"
-      />
-      <v-menu
-        v-model="menuOpen" activator="parent" :open-on-click="false"
-        :z-index="2400"
-      >
-        <v-list density="compact">
-          <v-list-item @click="$emit('alias', suggestion)">
-            <v-list-item-title>Treat as alias for…</v-list-item-title>
-          </v-list-item>
-          <v-list-item @click="$emit('dismiss', suggestion)">
-            <v-list-item-title>Dismiss for this image</v-list-item-title>
-          </v-list-item>
-        </v-list>
-      </v-menu>
-    </span>
+    <!-- Modal-safe kebab is baked into KebabMenu (this row lives in the
+         teleported image modal — #711). -->
+    <KebabMenu
+      class="fc-suggestion__menu" size="small" variant="outlined"
+      :label="`More actions for ${suggestion.display_name}`"
+    >
+      <v-list-item @click="$emit('alias', suggestion)">
+        <v-list-item-title>Treat as alias for…</v-list-item-title>
+      </v-list-item>
+      <v-list-item @click="$emit('dismiss', suggestion)">
+        <v-list-item-title>Dismiss for this image</v-list-item-title>
+      </v-list-item>
+    </KebabMenu>
   </div>
 </template>
 
 <script setup>
-import { computed, ref } from 'vue'
+import { computed } from 'vue'
+import KebabMenu from '../common/KebabMenu.vue'
 
 const props = defineProps({ suggestion: { type: Object, required: true } })
 defineEmits(['accept', 'alias', 'dismiss'])
 
-const menuOpen = ref(false)
 const scorePct = computed(() => `${Math.round(props.suggestion.score * 100)}%`)
 </script>
 
@@ -102,11 +85,6 @@ const scorePct = computed(() => `${Math.round(props.suggestion.score * 100)}%`)
 .fc-suggestion__accept :deep(.v-btn__content) {
   font-size: 12px; letter-spacing: 0.02em;
 }
-.fc-suggestion__menu-wrap {
-  flex: 0 0 auto;
-  display: inline-flex;
-  align-items: center;
-}
 .fc-suggestion__menu {
   flex: 0 0 auto;
 }