fix(v2): skip metadata aggregations on later gallery windows

Once the bootstrap or window 0 has populated the filter panel, alpha
strip, and id index, later window fetches only need their paged items.
Send with_char_index=false and with_filter_values=false so the backend
doesn't recompute those aggregations for every window.

Generated-By: PostHog Code
Task-Id: daf23950-b84a-4537-971c-3f85425c172c

Author: gantoine

frontend/src/services/api/rom.ts

@@ -182,6 +182,11 @@ export interface GetRomsParams {
   playerCountsLogic?: string | null;
   metadataProvidersLogic?: string | null;
   tagsLogic?: string | null;
+  // Skip the char index / filter-value aggregations server-side. Left
+  // undefined (the server default is `true`) unless a caller has already
+  // hydrated that metadata and only wants the paged items.
+  withCharIndex?: boolean;
+  withFilterValues?: boolean;
   // Cancellation: pass an AbortSignal to let the caller abort an
   // in-flight request (e.g. search-typing → previous query aborted,
   // gallery-context switch → previous platform's windows aborted).
@@ -231,6 +236,8 @@ async function getRoms({
   playerCountsLogic = null,
   metadataProvidersLogic = null,
   tagsLogic = null,
+  withCharIndex = undefined,
+  withFilterValues = undefined,
   signal = undefined,
 }: GetRomsParams) {
   const params = {
@@ -336,6 +343,10 @@ async function getRoms({
     ...(filterSaves !== null ? { has_saves: filterSaves } : {}),
     ...(filterStates !== null ? { has_states: filterStates } : {}),
     ...(filterVerified !== null ? { verified: filterVerified } : {}),
+    ...(withCharIndex !== undefined ? { with_char_index: withCharIndex } : {}),
+    ...(withFilterValues !== undefined
+      ? { with_filter_values: withFilterValues }
+      : {}),
   };
 
   return api.get<GetRomsResponse>(`/roms`, {

frontend/src/v2/stores/galleryRoms.ts

@@ -460,9 +460,18 @@ export default defineStore("v2GalleryRoms", {
       const controller = new AbortController();
       inFlightControllers.set(ctrlKey, controller);
 
+      // Once the bootstrap (or window 0) has populated the filter panel,
+      // alpha strip, and id index, later windows only need their paged
+      // items — skip the char index / filter-value aggregations so the
+      // backend doesn't recompute them for every window.
+      const skipMetadata = this.metadataLoaded;
+
       try {
         const response = await romApi.getRoms({
           ...params,
+          ...(skipMetadata
+            ? { withCharIndex: false, withFilterValues: false }
+            : {}),
           signal: controller.signal,
         });
         // Re-check that this window is still relevant — invalidateWindows