feed: support nostr:npub uri scheme (part of nip-21)

added support for nostr:npub links in textnotes content.

src/utils/dom.ts

@@ -1,3 +1,4 @@
+import {nip19} from 'nostr-tools';
 import {isNotNull} from './array';
 import {isValidURL} from './url';
 
@@ -96,6 +97,13 @@ export const parseTextContent = (
             href: `lightning:${word}`
           }, `lightning:${word.slice(0, 24)}…`);
         }
+        if (word.startsWith('nostr:npub') && word.length === 69) {
+          const npub = word.slice(6);
+          const {type, data} = nip19.decode(npub);
+          if (type === 'npub') {
+            return elem('a', {href: `/${npub}`, data: {profile: data}}, data.slice(6, 15))
+          }
+        }
         if (!word.match(/^(https?:\/\/|www\.)\S*/)) {
           return word;
         }