fix(ui): surface auto-hide misfires proactively — review strip no longer gated on Show-hidden (#141)

The conflict-flag review strip only appeared when "Show hidden" was toggled on, so
misfires could go unnoticed — defeating the point of flagging them. Fetch pending
flags on mount and show the strip whenever there are any, independent of the
toggle (operator-flagged). Gated to the main gallery (not the post-detail view),
matching the filter bar.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CDgx8bQS5YrGRK76v8HUnM

frontend/src/views/GalleryView.vue

@@ -13,7 +13,7 @@
       <div class="fc-gallery-layout__main">
         <PostInfoHeader />
         <GalleryFilterBar v-if="store.filter.post_id == null" />
-        <HiddenReviewStrip />
+        <HiddenReviewStrip v-if="store.filter.post_id == null" />
         <EmptyState v-if="store.isEmpty" />
         <GalleryGrid v-else @open="openImage" />
       </div>