feat: add website display and filter non-platform tags

NIP-89 renderer improvements:
- Add getAppWebsite() helper to extract website from content JSON
- Display website URL in both feed and detail renderers with external link
- Filter out non-platform tags (r, t, client, alt, e, p, a) to prevent garbage display
- Remove relay hint display from HandlerRecommendationDetailRenderer
- Clean up unused relayHint parameter

Fixes the 'r r' tag appearing as a platform by properly excluding
common non-platform tags when detecting platform URLs.

src/components/nostr/kinds/ApplicationHandlerDetailRenderer.tsx

@@ -5,6 +5,7 @@ import {
   getSupportedKinds,
   getPlatformUrls,
   getHandlerIdentifier,
+  getAppWebsite,
 } from "@/lib/nip89-helpers";
 import { KindBadge } from "@/components/KindBadge";
 import { Badge } from "@/components/ui/badge";
@@ -16,6 +17,7 @@ import {
   Globe,
   Smartphone,
   TabletSmartphone,
+  ExternalLink,
 } from "lucide-react";
 
 interface ApplicationHandlerDetailRendererProps {
@@ -76,6 +78,7 @@ export function ApplicationHandlerDetailRenderer({
   const supportedKinds = getSupportedKinds(event);
   const platformUrls = getPlatformUrls(event);
   const identifier = getHandlerIdentifier(event);
+  const website = getAppWebsite(event);
 
   return (
     <div className="flex flex-col gap-6 p-6">
@@ -89,6 +92,19 @@ export function ApplicationHandlerDetailRenderer({
           <p className="text-muted-foreground text-lg">{description}</p>
         )}
 
+        {/* Website */}
+        {website && (
+          <a
+            href={website}
+            target="_blank"
+            rel="noopener noreferrer"
+            className="inline-flex items-center gap-1 text-primary hover:underline"
+          >
+            {website}
+            <ExternalLink className="size-3" />
+          </a>
+        )}
+
         {/* Metadata Grid */}
         <div className="grid grid-cols-2 gap-4 text-sm">
           {/* Publisher */}

src/components/nostr/kinds/ApplicationHandlerRenderer.tsx

@@ -7,6 +7,7 @@ import {
   getAppName,
   getSupportedKinds,
   getAvailablePlatforms,
+  getAppWebsite,
 } from "@/lib/nip89-helpers";
 import { KindBadge } from "@/components/KindBadge";
 import { Badge } from "@/components/ui/badge";
@@ -40,6 +41,7 @@ export function ApplicationHandlerRenderer({ event }: BaseEventProps) {
   const appName = getAppName(event);
   const supportedKinds = getSupportedKinds(event);
   const platforms = getAvailablePlatforms(event);
+  const website = getAppWebsite(event);
 
   // Show max 8 kinds in feed view
   const MAX_KINDS_IN_FEED = 8;
@@ -57,6 +59,19 @@ export function ApplicationHandlerRenderer({ event }: BaseEventProps) {
           {appName}
         </ClickableEventTitle>
 
+        {/* Website */}
+        {website && (
+          <a
+            href={website}
+            target="_blank"
+            rel="noopener noreferrer"
+            className="text-xs text-primary hover:underline"
+            onClick={(e) => e.stopPropagation()}
+          >
+            {website}
+          </a>
+        )}
+
         {/* Supported Kinds */}
         {displayKinds.length > 0 && (
           <div className="flex items-center gap-2 flex-wrap">

src/components/nostr/kinds/HandlerRecommendationDetailRenderer.tsx

@@ -45,11 +45,9 @@ function PlatformIcon({ platform }: { platform: string }) {
 function HandlerCard({
   address,
   platform,
-  relayHint,
 }: {
   address: { kind: number; pubkey: string; identifier: string };
   platform?: string;
-  relayHint?: string;
 }) {
   const { addWindow } = useGrimoire();
   const handlerEvent = useNostrEvent(address);
@@ -142,19 +140,14 @@ function HandlerCard({
       )}
 
       {/* Recommendation Context */}
-      {(platform || relayHint) && (
+      {platform && (
         <div className="flex flex-col gap-1 pt-2 border-t border-border text-xs text-muted-foreground">
-          {platform && (
-            <div>
-              Recommended for:{" "}
-              <Badge variant="outline" className="text-[10px] ml-1">
-                {platform}
-              </Badge>
-            </div>
-          )}
-          {relayHint && (
-            <div className="font-mono">Relay hint: {relayHint}</div>
-          )}
+          <div>
+            Recommended for:{" "}
+            <Badge variant="outline" className="text-[10px] ml-1">
+              {platform}
+            </Badge>
+          </div>
         </div>
       )}
     </div>
@@ -260,7 +253,6 @@ export function HandlerRecommendationDetailRenderer({
                 key={idx}
                 address={ref.address}
                 platform={ref.platform}
-                relayHint={ref.relayHint}
               />
             ))}
           </div>

src/lib/nip89-helpers.ts

@@ -123,14 +123,15 @@ export function getPlatformUrls(event: NostrEvent): Record<string, string> {
   }
 
   // Also check for any other platform tags
+  // Exclude common non-platform tags: d, k, r, t, client, etc.
+  const excludedTags = ["d", "k", "r", "t", "client", "alt", "e", "p", "a"];
   for (const tag of event.tags) {
     const tagName = tag[0];
     const tagValue = tag[1];
     if (
       tagValue &&
       !knownPlatforms.includes(tagName) &&
-      tagName !== "d" &&
-      tagName !== "k"
+      !excludedTags.includes(tagName)
     ) {
       // Could be a custom platform tag
       if (tagValue.includes("://") || tagValue.includes("<bech32>")) {
@@ -149,6 +150,26 @@ export function getAvailablePlatforms(event: NostrEvent): string[] {
   return Object.keys(getPlatformUrls(event));
 }
 
+/**
+ * Extract website URL from kind 31990 event content JSON
+ */
+export function getAppWebsite(event: NostrEvent): string | undefined {
+  if (event.kind !== 31990 || !event.content) return undefined;
+
+  try {
+    const metadata = JSON.parse(event.content);
+    if (metadata && typeof metadata === "object") {
+      const website = metadata.website;
+      if (website && typeof website === "string") {
+        return website;
+      }
+    }
+  } catch {
+    // Invalid JSON
+  }
+  return undefined;
+}
+
 /**
  * Get the d tag identifier from kind 31990 event
  */