feat(500): Settings shows the shipped reply shapes, what adjusts each, and how often each arrives

Settings > General > Reply shapes. One menu row per shape (core, completion,
asks, plan): its title and when it arrives, how many of the operator's
preferences adjust it, and its deliveries over 30 days (in full / as a
reminder, "—" when the counts cannot be read). A verdict line leads. Opening a
row shows the shipped text, read-only because it is product, and the
preferences mounted on its moment; each opens in the rule editor, and "Adjust
this" opens a new preference already mounted on the shape's moment with a
starting trigger.

The rule editor takes an optional preset (kind, moments, trigger) and, opened
outside the Rules view, asks where a new record lives instead of dropping it.
GET /api/retrieval/reply-shapes now returns reply_shapes.overview: the
catalog plus mounted preferences (the same lookup that delivers them) and
counts from the reply_shape delivery rows. #5497 (step 5 of milestone 500).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

frontend/src/views/SettingsView.vue

@@ -10,6 +10,7 @@ import type { User } from "@/types/auth";
 import PaginationBar from "@/components/PaginationBar.vue";
 import TagInput from "@/components/TagInput.vue";
 import MomentsSettings from "@/components/MomentsSettings.vue";
+import ReplyShapesSettings from "@/components/ReplyShapesSettings.vue";
 import { fmtDate, fmtLogStamp } from "@/utils/dateFormat";
 import { fetchVersion, type VersionPayload } from "@/api/version";
 
@@ -2250,6 +2251,15 @@ async function deleteUser(userId: number) {
         <MomentsSettings />
       </section>
 
+      <section class="settings-section full-width">
+        <h2>Reply shapes</h2>
+        <p class="section-desc">
+          The default shape of each kind of reply, delivered to a session when it is due.
+          Adjust one with a preference; it arrives beside the shape and wins.
+        </p>
+        <ReplyShapesSettings />
+      </section>
+
     </div>
 
     <!-- ── Account ── -->