fix: the filter rail goes, and the subscriptions card stops listing what you don't pay for — and can be dismissed

Operator live review of #253 on the wide window. The images landed well, but:

- "the left rail feels like wasted space". The filters and check status move back into one row above the feed (PostsView). On a wide window the row lines up with the feed column, clear of the day gutter, and the container recentres without the 280px rail. The narrow layout is as before, with the status still first. This retires #407 option E; A and D stay.

- The "you can't see" link landed on the Subscriptions reconcile card, which listed 9 sources as `former_patron` under "sources your roster doesn't account for". The operator doesn't want sources they no longer pay for listed there, and wants the card dismissable "unless something changes":
  - MembershipReconcileCard renders only "creators you subscribe to but don't follow here" and the stale-roster warning.
  - Stopping pulls on lapsed sources is the membership sweep's job instead (#3995, next).
  - A close button dismisses the card. The dismissal is keyed to a fingerprint of what the card says (offered membership ids plus stale-roster flags), so a new subscription or a roster going stale brings it back. It's stored per browser, which is enough for a single-operator instance.

The backend still computes tracked_not_subscribed. #3995 acts on it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SHQB1YukL3VyvMK8rcbmV9

frontend/src/views/PostsView.vue

@@ -1,7 +1,7 @@
 <template>
   <!-- Width is set in CSS, not with `max-width` here: below 1600px it is
-       today's 900px column, and above it the feed widens and gains the rail
-       and day gutter (milestone #407). -->
+       today's 900px column, and above it the feed widens and gains the day
+       gutter (milestone #407). -->
   <v-container fluid class="pt-2 pb-6 fc-posts">
     <!-- In-context view: deep-linked to one post, with bidirectional infinite
          scroll — newer posts load above, older posts below. -->
@@ -51,19 +51,20 @@
     </template>
 
     <!-- Normal feed -->
-    <div v-else class="fc-posts__layout">
-      <!-- On a wide window this is a sticky left rail (#407 E); below the
-           breakpoint it lays out exactly as the old inline header did. -->
-      <aside class="fc-posts__rail">
+    <div v-else class="fc-posts__main">
+      <!-- Filters and status sit in one row above the feed. #407 option E put
+           them in a sticky left rail; the operator found it wasted space
+           (2026-09-13), so on a wide window this row lines up with the feed
+           column instead, clear of the day gutter. -->
+      <div class="fc-posts__toolbar">
+        <FeedStatusRibbon v-if="statusRibbon" class="fc-posts__status" />
         <PostsFilterBar
           :artist-id="artistFilter"
           :platform="platformFilter"
           @update:filters="onFilters"
         />
-        <FeedStatusRibbon v-if="statusRibbon" />
-      </aside>
+      </div>
 
-      <div class="fc-posts__main">
       <v-alert v-if="store.error" type="error" variant="tonal" closable class="mb-3">
         {{ String(store.error) }}
       </v-alert>
@@ -101,7 +102,6 @@
           <span v-else-if="store.done" class="fc-posts__end">End of stream</span>
         </div>
       </div>
-      </div>
     </div>
   </v-container>
 </template>
@@ -313,44 +313,25 @@ onUnmounted(() => { teardownFeed(); teardownAround() })
 }
 .fc-posts__day-count { font-size: 0.78rem; }
 
-/* Wide window (#407 D + E). The rail holds filters and status; each day's
-   heading moves into a sticky gutter beside its posts; the column widens and
-   the cards switch to their filmstrip layout on their own (PostCard measures
-   itself). 1600px is where a 280px rail and a 150px gutter still leave a card
-   wide enough to be worth the change. */
+/* Wide window (#407 A + D). Each day's heading moves into a sticky gutter
+   beside its posts; the column widens and the cards switch to their filmstrip
+   layout on their own (PostCard measures itself). The toolbar lines up with the
+   feed column, clear of the gutter. */
 @media (min-width: 1600px) {
-  .fc-posts { max-width: 2360px; }
-  .fc-posts__layout {
-    display: grid;
-    grid-template-columns: 280px minmax(0, 1fr);
-    gap: 40px;
-    align-items: start;
-  }
-  .fc-posts__rail {
-    position: sticky;
-    top: calc(var(--fc-nav-h, 64px) + 16px);
+  .fc-posts { max-width: 2080px; }
+  .fc-posts__main { max-width: 2080px; margin: 0 auto; }
+  .fc-posts__toolbar {
     display: flex;
-    flex-direction: column;
-    gap: 16px;
+    align-items: center;
+    flex-wrap: wrap;
+    gap: 8px 24px;
+    margin-left: calc(150px + 24px);
+    margin-bottom: 8px;
   }
-  .fc-posts__rail :deep(.fc-posts-filters) {
-    flex-direction: column;
-    align-items: stretch;
-    padding-bottom: 0;
-  }
-  .fc-posts__rail :deep(.fc-posts-filters__artist),
-  .fc-posts__rail :deep(.fc-posts-filters__platform) {
-    flex: none;
-    width: 100%;
-    min-width: 0;
-    max-width: none;
-  }
-  .fc-posts__rail :deep(.fc-ribbon) {
-    flex-direction: column;
-    align-items: flex-start;
-    gap: 8px;
-  }
-  .fc-posts__main { max-width: 1900px; }
+  /* Status reads after the filters on a wide row, but stays first when the
+     narrow layout stacks them (it is the front door's headline). */
+  .fc-posts__status { order: 2; padding: 0; }
+  .fc-posts__toolbar :deep(.fc-posts-filters) { padding-bottom: 0; }
   .fc-posts__day {
     display: grid;
     grid-template-columns: 150px minmax(0, 1fr);