fix: normalize federated asset URLs in explore and social stores

Resolve remote instance avatars and space icons at the data boundary
so they render correctly instead of 404ing against the home instance.

packages/web/src/stores/exploreStore.ts

@@ -1,6 +1,7 @@
 import { create } from 'zustand';
 import type { ExploreSpace, JoinRequest, SpaceWithChannelsAndMembers } from '@backspace/shared';
 import { api } from '../api/client';
+import { resolveAssetUrl } from '../utils/assetUrls';
 import { useInstanceStore } from './instanceStore';
 import { useSpaceStore } from './spaceStore';
 
@@ -89,6 +90,9 @@ export const useExploreStore = create<ExploreState>((set, get) => ({
           const key = `${space.id}:${origin}`;
           if (seen.has(key)) continue;
           seen.add(key);
+          if (origin && space.icon) {
+            space.icon = resolveAssetUrl(space.icon, origin) ?? space.icon;
+          }
           allSpaces.push({ ...space, _instanceOrigin: origin, joined: space.joined ?? false });
         }
       }