fix(quotes): keep same-thread board previews local

src/stores/__tests__/interaction-stores.test.ts

@@ -4,7 +4,7 @@ import useCreateBoardModalStore from '../use-create-board-modal-store';
 import useDirectoryModalStore from '../use-directory-modal-store';
 import useDisclaimerModalStore, { DISCLAIMER_ACCEPTED_KEY } from '../use-disclaimer-modal-store';
 import useFeedResetStore from '../use-feed-reset-store';
-import usePostNumberStore from '../use-post-number-store';
+import usePostNumberStore, { getCidForPostNumber, getScopedNumberToCidMap } from '../use-post-number-store';
 import useReplyModalStore from '../use-reply-modal-store';
 import useSelectedTextStore from '../use-selected-text-store';
 import useSortingStore from '../use-sorting-store';
@@ -235,6 +235,26 @@ describe('interaction stores', () => {
     expect(usePostNumberStore.getState().numberToCid).toBe(numberToCidRef);
   });
 
+  it('merges alias-scoped post number maps when the exact board scope is only partially populated', () => {
+    const numberToCid = {
+      'music.eth': {
+        1: 'op-cid',
+        2: 'reply-cid',
+      },
+      'music.bso': {
+        30: 'late-reply-cid',
+      },
+    };
+
+    expect(getScopedNumberToCidMap(numberToCid, 'music.bso')).toEqual({
+      1: 'op-cid',
+      2: 'reply-cid',
+      30: 'late-reply-cid',
+    });
+    expect(getCidForPostNumber(numberToCid, 'music.bso', 1)).toBe('op-cid');
+    expect(getCidForPostNumber(numberToCid, 'music.bso', 30)).toBe('late-reply-cid');
+  });
+
   it('opens reply modals with quoted selection and mobile scroll state', () => {
     Object.defineProperty(window, 'innerWidth', {
       configurable: true,

src/stores/use-post-number-store.ts

@@ -1,5 +1,6 @@
 import { create } from 'zustand';
 import type { Comment } from '@bitsocialnet/bitsocial-react-hooks';
+import { normalizeBoardAddress } from '../hooks/use-directories';
 
 interface PostNumberState {
   // Post numbers are only unique within a board, so scope by canonical community address.
@@ -8,6 +9,38 @@ interface PostNumberState {
   registerComments: (comments: Comment[]) => void;
 }
 
+export const getScopedNumberToCidMap = (numberToCid: Record<string, Record<number, string>>, communityAddress?: string) => {
+  if (!communityAddress) {
+    return undefined;
+  }
+
+  const normalizedCommunityAddress = normalizeBoardAddress(communityAddress);
+  const exactMatch = numberToCid[communityAddress];
+  const matchingEntries = Object.entries(numberToCid).filter(([address]) => normalizeBoardAddress(address) === normalizedCommunityAddress);
+
+  if (matchingEntries.length === 0) {
+    return exactMatch;
+  }
+
+  if (!exactMatch && matchingEntries.length === 1) {
+    return matchingEntries[0][1];
+  }
+
+  if (!exactMatch) {
+    return matchingEntries.reduce<Record<number, string>>((mergedMap, [, scopedMap]) => ({ ...mergedMap, ...scopedMap }), {});
+  }
+
+  if (matchingEntries.length === 1) {
+    return exactMatch;
+  }
+
+  const aliasEntries = matchingEntries.filter(([address]) => address !== communityAddress);
+  return aliasEntries.reduce<Record<number, string>>((mergedMap, [, scopedMap]) => ({ ...mergedMap, ...scopedMap }), { ...exactMatch });
+};
+
+export const getCidForPostNumber = (numberToCid: Record<string, Record<number, string>>, communityAddress: string | undefined, postNumber: number) =>
+  getScopedNumberToCidMap(numberToCid, communityAddress)?.[postNumber];
+
 const usePostNumberStore = create<PostNumberState>((set) => ({
   numberToCid: {},
   cidToNumber: {},