Show NSFW-node posts to authenticated local members in Curated and Swarm feeds

Hop-State: A_06FP9V8EJ8CX3VM4D7DDZJR
Hop-Proposal: R_06FP9V7H6GNGX6CFBQN8HER
Hop-Task: T_06FP9TA4HBBMJPF6SDEMEC0
Hop-Attempt: AT_06FP9TA4HBQJXX3KT14FYN0

src/lib/nsfw/feed-access.ts

@@ -0,0 +1,17 @@
+export interface NsfwFeedViewer {
+    nsfwEnabled?: boolean;
+}
+
+export function shouldIncludeNsfwFeed({
+    viewer,
+    localNodeIsNsfw,
+}: {
+    viewer: NsfwFeedViewer | null;
+    localNodeIsNsfw: boolean;
+}): boolean {
+    if (!viewer) return false;
+
+    // Signing in to an NSFW node is consent to view its feed. On other nodes,
+    // the viewer's explicit account preference remains authoritative.
+    return localNodeIsNsfw || viewer.nsfwEnabled === true;
+}