Add NIP-05 badges, hashtag pages, keyword muting, suggestion dismissal, notification poller

- Article cover: aspect-video replaces max-h-72 for consistent 16:9
- NIP-05 verification badge on note cards with 1-hour TTL cache
- Dedicated hashtag feed pages (clicking #tag opens live feed, not search)
- Keyword muting: word-boundary matching, applied across all feed views
- Follow suggestion dismissal: persistent "don't suggest again" per person
- Background notification poller (60s): mentions, zaps, new followers
- All notification types independently toggleable in settings
- Centralized notification firing (removed inline store notifications)

src/components/feed/NoteContent.tsx

@@ -194,7 +194,7 @@ interface NoteContentProps {
 }
 
 export function NoteContent({ content, inline, mediaOnly }: NoteContentProps) {
-  const { openSearch } = useUIStore();
+  const { openHashtag } = useUIStore();
   const segments = parseContent(content);
   const images: string[] = segments.filter((s) => s.type === "image").map((s) => s.value);
   const videos: string[] = segments.filter((s) => s.type === "video").map((s) => s.value);
@@ -246,7 +246,7 @@ export function NoteContent({ content, inline, mediaOnly }: NoteContentProps) {
             <span
               key={i}
               className="text-accent/80 cursor-pointer hover:text-accent"
-              onClick={(e) => { e.stopPropagation(); openSearch(`#${seg.value}`); }}
+              onClick={(e) => { e.stopPropagation(); openHashtag(seg.value); }}
             >
               {seg.display}
             </span>
@@ -441,7 +441,7 @@ export function NoteContent({ content, inline, mediaOnly }: NoteContentProps) {
           <span
             key={i}
             className="text-accent/80 cursor-pointer hover:text-accent"
-            onClick={(e) => { e.stopPropagation(); openSearch(`#${seg.value}`); }}
+            onClick={(e) => { e.stopPropagation(); openHashtag(seg.value); }}
           >
             {seg.display}
           </span>