refactor(members): migrate members/index to PageShell

Wrap members directory page in PageShell. Also expand visual mask
selectors to cover .filter-bar, .skills-bar, and .connections-section
because filter content varies based on dynamic tag/topic state and
async fetch ordering. Rebaselines several existing snapshots that now
mask wider regions but capture the same structural layout.

app/pages/members/index.vue

@@ -1,11 +1,8 @@
 <template>
-  <div class="members-page">
-    <!-- Page Header -->
-    <PageHeader
-      title="Members"
-      :subtitle="`${totalCount} member${totalCount === 1 ? '' : 's'} across 3 circles`"
-    />
-
+  <PageShell
+    title="Members"
+    :subtitle="`${totalCount} member${totalCount === 1 ? '' : 's'} across 3 circles`"
+  >
     <!-- Filter Bar -->
     <div class="filter-bar">
       <input
@@ -264,7 +261,7 @@
         <NuxtLink to="/join" class="btn btn-primary">Join Ghost Guild</NuxtLink>
       </div>
     </div>
-  </div>
+  </PageShell>
 </template>
 
 <script setup>