fix(tv): replace season sheet with advanced request modal, not stack it

When a user has advanced-request permission, the season-select sheet
opened the advanced request modal via router.back() + push(). back() is
batched, so the push landed first and the advanced sheet stacked on top
of the season sheet, breaking focus. Add a `replace` option to
showRequestModal and use it here so the advanced modal takes the season
sheet's place in the stack.

Claude-Session: https://claude.ai/code/session_016Hhu5DruGLPhdP4LAoy1Xd

app/(auth)/tv-season-select-modal.tsx

@@ -257,14 +257,15 @@ export default function TVSeasonSelectModalPage() {
     };
 
     if (modalState.hasAdvancedRequestPermission) {
-      // Close this modal and open the advanced request modal
-      router.back();
+      // Replace this sheet with the advanced request modal so it takes our
+      // place in the stack instead of stacking on top (which breaks focus).
       showRequestModal({
         requestBody: body,
         title: modalState.title,
         id: modalState.mediaId,
         mediaType: MediaType.TV,
         onRequested: modalState.onRequested,
+        replace: true,
       });
       return;
     }

hooks/useTVRequestModal.ts

@@ -11,6 +11,12 @@ interface ShowRequestModalParams {
   id: number;
   mediaType: MediaType;
   onRequested: () => void;
+  /**
+   * Replace the current route instead of pushing. Use when opening the request
+   * modal from another modal (e.g. the season selector) so the new sheet takes
+   * its place rather than stacking on top of it (which breaks TV focus).
+   */
+  replace?: boolean;
 }
 
 export const useTVRequestModal = () => {
@@ -25,7 +31,11 @@ export const useTVRequestModal = () => {
         mediaType: params.mediaType,
         onRequested: params.onRequested,
       });
-      router.push("/(auth)/tv-request-modal");
+      if (params.replace) {
+        router.replace("/(auth)/tv-request-modal");
+      } else {
+        router.push("/(auth)/tv-request-modal");
+      }
     },
     [router],
   );