docs(traces): tag episode focus view and library detail with TRACES

Add TRACES comments linking the episode focus view and library detail
page to their existing requirements.

TRACES: UR-035, UR-038, UR-048 | DR-043, DR-061, DR-062

src/lib/components/library/EpisodeFocusView.svelte

@@ -1,3 +1,4 @@
+<!-- TRACES: UR-048 | DR-061, DR-062 -->
 <script lang="ts">
   import { goto } from "$app/navigation";
   import { truncateMiddle } from "$lib/utils/truncateMiddle";

src/routes/library/[id]/+page.svelte

@@ -1,3 +1,4 @@
+<!-- TRACES: UR-035, UR-038, UR-048 | DR-043, DR-062 -->
 <script lang="ts">
   import { onMount, untrack } from "svelte";
   import { page } from "$app/stores";
@@ -515,13 +516,17 @@
         </div>
       {/if}
 
-      <!-- Cast Section - for Movies, Series, and Episodes -->
-      {#if (item.type === "Movie" || item.type === "Series" || item.type === "Episode") && item.people?.length}
+      <!-- Cast / Related — for Movies and Episodes these sit above the content
+           block; for Series they render *below* the seasons instead, so
+           continuation content precedes discovery content (UX §5B.4). -->
+      {#if item.type !== "Series"}
+        <!-- Cast Section - for Movies and Episodes -->
+        {#if (item.type === "Movie" || item.type === "Episode") && item.people?.length}
           <CastSection people={item.people ?? undefined} />
         {/if}
 
-      <!-- Related Items Section - for Movies and Series -->
-      {#if (item.type === "Movie" || item.type === "Series") && (item.genres?.length || item.people?.length)}
+        <!-- Related Items Section - for Movies -->
+        {#if item.type === "Movie" && (item.genres?.length || item.people?.length)}
           <RelatedItemsSection
             currentItemId={item.id}
             itemType={item.type}
@@ -530,6 +535,7 @@
             limit={12}
           />
         {/if}
+      {/if}
 
       <!-- Content items -->
       <div>
@@ -580,6 +586,21 @@
                 />
               {/each}
             {/if}
+
+            <!-- Discovery content sits below the episodes (UX §5B.4) -->
+            {#if item.people?.length}
+              <CastSection people={item.people ?? undefined} />
+            {/if}
+
+            {#if item.genres?.length || item.people?.length}
+              <RelatedItemsSection
+                currentItemId={item.id}
+                itemType={item.type}
+                genres={item.genres ?? undefined}
+                people={item.people ?? undefined}
+                limit={12}
+              />
+            {/if}
           </div>
         {:else if item.type === "MusicArtist"}
           <!-- Enhanced artist detail view with discography -->