Wire up NIP-19 / NIP-21 navigation + hashtag search from notes

- Mention clicks (nostr:npub1, nostr:nprofile) open internal ProfileView
- njump.me links intercepted: npub/nprofile decoded and opened internally,
  note/nevent/naddr fall through to browser (no reader yet)
- Hashtag clicks navigate to SearchView and auto-run the search
- openSearch(query) action added to UIStore; pendingSearch consumed on mount

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/components/feed/NoteContent.tsx

@@ -1,5 +1,6 @@
 import { ReactNode } from "react";
 import { nip19 } from "@nostr-dev-kit/ndk";
+import { useUIStore } from "../../stores/ui";
 
 // Regex patterns
 const URL_REGEX = /https?:\/\/[^\s<>"')\]]+/g;
@@ -116,7 +117,39 @@ function parseContent(content: string): ContentSegment[] {
   return segments;
 }
 
+// Returns true if we handled the URL internally (njump.me interception).
+function tryHandleUrlInternally(url: string): boolean {
+  try {
+    const u = new URL(url);
+    if (u.hostname === "njump.me") {
+      const entity = u.pathname.replace(/^\//, "");
+      if (entity) return tryOpenNostrEntity(entity);
+    }
+  } catch { /* not a valid URL */ }
+  return false;
+}
+
+// Decodes a NIP-19 bech32 string and navigates internally where possible.
+// Returns true if handled, false if the caller should fall back to a browser open.
+function tryOpenNostrEntity(raw: string): boolean {
+  try {
+    const decoded = nip19.decode(raw);
+    const { openProfile } = useUIStore.getState();
+    if (decoded.type === "npub") {
+      openProfile(decoded.data as string);
+      return true;
+    }
+    if (decoded.type === "nprofile") {
+      openProfile((decoded.data as { pubkey: string }).pubkey);
+      return true;
+    }
+    // note / nevent / naddr — no internal reader yet, fall through to njump.me
+  } catch { /* invalid entity */ }
+  return false;
+}
+
 export function NoteContent({ content }: { content: string }) {
+  const { openSearch } = 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);
@@ -136,6 +169,9 @@ export function NoteContent({ content }: { content: string }) {
             target="_blank"
             rel="noopener noreferrer"
             className="text-accent hover:text-accent-hover underline underline-offset-2 decoration-accent/40"
+            onClick={(e) => {
+              if (tryHandleUrlInternally(seg.value)) e.preventDefault();
+            }}
           >
             {seg.display}
           </a>
@@ -146,6 +182,10 @@ export function NoteContent({ content }: { content: string }) {
           <span
             key={i}
             className="text-accent cursor-pointer hover:text-accent-hover"
+            onClick={(e) => {
+              e.stopPropagation();
+              tryOpenNostrEntity(seg.value);
+            }}
           >
             @{seg.display}
           </span>
@@ -156,6 +196,10 @@ export function NoteContent({ content }: { content: string }) {
           <span
             key={i}
             className="text-accent/80 cursor-pointer hover:text-accent"
+            onClick={(e) => {
+              e.stopPropagation();
+              openSearch(`#${seg.value}`);
+            }}
           >
             {seg.display}
           </span>

src/components/search/SearchView.tsx

@@ -1,4 +1,4 @@
-import { useState, useRef } from "react";
+import { useState, useRef, useEffect } from "react";
 import { NDKEvent } from "@nostr-dev-kit/ndk";
 import { searchNotes, searchUsers } from "../../lib/nostr";
 import { useUserStore } from "../../stores/user";
@@ -88,7 +88,8 @@ function UserRow({ user }: { user: ParsedUser }) {
 }
 
 export function SearchView() {
-  const [query, setQuery] = useState("");
+  const { pendingSearch } = useUIStore();
+  const [query, setQuery] = useState(pendingSearch ?? "");
   const [noteResults, setNoteResults] = useState<NDKEvent[]>([]);
   const [userResults, setUserResults] = useState<ParsedUser[]>([]);
   const [loading, setLoading] = useState(false);
@@ -98,14 +99,24 @@ export function SearchView() {
 
   const isHashtag = query.trim().startsWith("#");
 
-  const handleSearch = async () => {
-    const q = query.trim();
+  // If opened with a pending search query (e.g. from a hashtag click), run it immediately
+  useEffect(() => {
+    if (pendingSearch) {
+      useUIStore.setState({ pendingSearch: null });
+      handleSearch(pendingSearch);
+    }
+  }, []);
+
+  const handleSearch = async (overrideQuery?: string) => {
+    const q = (overrideQuery ?? query).trim();
     if (!q) return;
+    if (overrideQuery) setQuery(overrideQuery);
     setLoading(true);
     setSearched(false);
     try {
+      const isTag = q.startsWith("#");
       const notesPromise = searchNotes(q);
-      const usersPromise = isHashtag ? Promise.resolve([]) : searchUsers(q);
+      const usersPromise = isTag ? Promise.resolve([]) : searchUsers(q);
       const [notes, userEvents] = await Promise.all([notesPromise, usersPromise]);
       setNoteResults(notes);
       setUserResults(userEvents.map(parseUserEvent));
@@ -137,7 +148,7 @@ export function SearchView() {
             className="flex-1 bg-transparent text-text text-[13px] placeholder:text-text-dim focus:outline-none"
           />
           <button
-            onClick={handleSearch}
+            onClick={() => handleSearch()}
             disabled={!query.trim() || loading}
             className="text-[11px] px-3 py-1 border border-border text-text-muted hover:text-accent hover:border-accent/40 transition-colors disabled:opacity-30 disabled:cursor-not-allowed shrink-0"
           >

src/stores/ui.ts

@@ -10,9 +10,11 @@ interface UIState {
   selectedPubkey: string | null;
   selectedNote: NDKEvent | null;
   previousView: View;
+  pendingSearch: string | null;
   setView: (view: View) => void;
   openProfile: (pubkey: string) => void;
   openThread: (note: NDKEvent, from: View) => void;
+  openSearch: (query: string) => void;
   goBack: () => void;
   toggleSidebar: () => void;
 }
@@ -23,9 +25,11 @@ export const useUIStore = create<UIState>((set, _get) => ({
   selectedPubkey: null,
   selectedNote: null,
   previousView: "feed",
+  pendingSearch: null,
   setView: (currentView) => set({ currentView }),
   openProfile: (pubkey) => set((s) => ({ currentView: "profile", selectedPubkey: pubkey, previousView: s.currentView as View })),
   openThread: (note, from) => set({ currentView: "thread", selectedNote: note, previousView: from }),
+  openSearch: (query) => set({ currentView: "search", pendingSearch: query }),
   goBack: () => set((s) => ({
     currentView: s.previousView !== s.currentView ? s.previousView : "feed",
     selectedNote: null,