feat: resolve and display article titles for naddr references

- Add articleTitleResolver service to fetch article titles from relays
- Extract naddr identifiers from markdown content
- Fetch article titles in parallel using relay pool
- Replace naddr references with actual article titles
- Fallback to identifier if title fetch fails
- Update markdown processing to be async for title resolution
- Pass relayPool through component tree to enable resolution

Example: nostr:naddr1... now shows as "My Article Title" instead of "article:identifier"

Improves readability by showing human-friendly article titles in cross-references

src/components/ContentPanel.tsx

@@ -3,6 +3,7 @@ import ReactMarkdown from 'react-markdown'
 import remarkGfm from 'remark-gfm'
 import { FontAwesomeIcon } from '@fortawesome/react-fontawesome'
 import { faSpinner } from '@fortawesome/free-solid-svg-icons'
+import { RelayPool } from 'applesauce-relay'
 import { Highlight } from '../types/highlights'
 import { readingTime } from 'reading-time-estimator'
 import { hexToRgb } from '../utils/colorHelpers'
@@ -32,6 +33,7 @@ interface ContentPanelProps {
   currentUserPubkey?: string
   followedPubkeys?: Set<string>
   settings?: UserSettings
+  relayPool?: RelayPool | null
   // For highlight creation
   onTextSelection?: (text: string) => void
   onClearSelection?: () => void
@@ -51,6 +53,7 @@ const ContentPanel: React.FC<ContentPanelProps> = ({
   highlightStyle = 'marker',
   highlightColor = '#ffff00',
   settings,
+  relayPool,
   onHighlightClick,
   selectedHighlightId,
   highlightVisibility = { nostrverse: true, friends: true, mine: true },
@@ -59,7 +62,7 @@ const ContentPanel: React.FC<ContentPanelProps> = ({
   onTextSelection,
   onClearSelection
 }) => {
-  const { renderedHtml: renderedMarkdownHtml, previewRef: markdownPreviewRef, processedMarkdown } = useMarkdownToHTML(markdown)
+  const { renderedHtml: renderedMarkdownHtml, previewRef: markdownPreviewRef, processedMarkdown } = useMarkdownToHTML(markdown, relayPool)
   
   const { finalHtml, relevantHighlights } = useHighlightedContent({
     html,

src/components/ThreePaneLayout.tsx

@@ -302,6 +302,7 @@ const ThreePaneLayout: React.FC<ThreePaneLayoutProps> = (props) => {
               currentUserPubkey={props.currentUserPubkey}
               followedPubkeys={props.followedPubkeys}
               settings={props.settings}
+              relayPool={props.relayPool}
             />
           )}
         </div>

src/hooks/useMarkdownToHTML.ts

@@ -1,11 +1,16 @@
 import React, { useState, useEffect, useRef } from 'react'
-import { replaceNostrUrisInMarkdown } from '../utils/nostrUriResolver'
+import { RelayPool } from 'applesauce-relay'
+import { extractNaddrUris, replaceNostrUrisInMarkdown, replaceNostrUrisInMarkdownWithTitles } from '../utils/nostrUriResolver'
+import { fetchArticleTitles } from '../services/articleTitleResolver'
 
 /**
  * Hook to convert markdown to HTML using a hidden ReactMarkdown component
- * Also processes nostr: URIs in the markdown
+ * Also processes nostr: URIs in the markdown and resolves article titles
  */
-export const useMarkdownToHTML = (markdown?: string): { 
+export const useMarkdownToHTML = (
+  markdown?: string,
+  relayPool?: RelayPool | null
+): { 
   renderedHtml: string
   previewRef: React.RefObject<HTMLDivElement>
   processedMarkdown: string 
@@ -21,24 +26,59 @@ export const useMarkdownToHTML = (markdown?: string): {
       return
     }
 
-    // Process nostr: URIs in markdown before rendering
-    const processed = replaceNostrUrisInMarkdown(markdown)
-    setProcessedMarkdown(processed)
+    let isCancelled = false
 
-    console.log('📝 Converting markdown to HTML...')
+    const processMarkdown = async () => {
+      // Extract all naddr references
+      const naddrs = extractNaddrUris(markdown)
       
-    const rafId = requestAnimationFrame(() => {
-      if (previewRef.current) {
-        const html = previewRef.current.innerHTML
-        console.log('✅ Markdown converted to HTML:', html.length, 'chars')
-        setRenderedHtml(html)
+      let processed: string
+      
+      if (naddrs.length > 0 && relayPool) {
+        // Fetch article titles for all naddrs
+        try {
+          const articleTitles = await fetchArticleTitles(relayPool, naddrs)
+          
+          if (isCancelled) return
+          
+          // Replace nostr URIs with resolved titles
+          processed = replaceNostrUrisInMarkdownWithTitles(markdown, articleTitles)
+          console.log(`📚 Resolved ${articleTitles.size} article titles`)
+        } catch (error) {
+          console.warn('Failed to fetch article titles:', error)
+          // Fall back to basic replacement
+          processed = replaceNostrUrisInMarkdown(markdown)
+        }
       } else {
-        console.warn('⚠️ markdownPreviewRef.current is null')
+        // No articles to resolve, use basic replacement
+        processed = replaceNostrUrisInMarkdown(markdown)
       }
-    })
       
-    return () => cancelAnimationFrame(rafId)
-  }, [markdown])
+      if (isCancelled) return
+      
+      setProcessedMarkdown(processed)
+
+      console.log('📝 Converting markdown to HTML...')
+      
+      const rafId = requestAnimationFrame(() => {
+        if (previewRef.current && !isCancelled) {
+          const html = previewRef.current.innerHTML
+          console.log('✅ Markdown converted to HTML:', html.length, 'chars')
+          setRenderedHtml(html)
+        } else if (!isCancelled) {
+          console.warn('⚠️ markdownPreviewRef.current is null')
+        }
+      })
+
+      return () => cancelAnimationFrame(rafId)
+    }
+
+    processMarkdown()
+
+    return () => {
+      isCancelled = true
+    }
+  }, [markdown, relayPool])
 
   return { renderedHtml, previewRef, processedMarkdown }
 }

src/services/articleTitleResolver.ts

@@ -0,0 +1,87 @@
+import { RelayPool, completeOnEose } from 'applesauce-relay'
+import { lastValueFrom, takeUntil, timer, toArray } from 'rxjs'
+import { nip19 } from 'nostr-tools'
+import { AddressPointer } from 'nostr-tools/nip19'
+import { Helpers } from 'applesauce-core'
+import { RELAYS } from '../config/relays'
+
+const { getArticleTitle } = Helpers
+
+/**
+ * Fetch article title for a single naddr
+ * Returns the title or null if not found/error
+ */
+export async function fetchArticleTitle(
+  relayPool: RelayPool,
+  naddr: string
+): Promise<string | null> {
+  try {
+    const decoded = nip19.decode(naddr)
+    
+    if (decoded.type !== 'naddr') {
+      return null
+    }
+
+    const pointer = decoded.data as AddressPointer
+
+    // Define relays to query
+    const relays = pointer.relays && pointer.relays.length > 0 
+      ? pointer.relays 
+      : RELAYS
+
+    // Fetch the article event
+    const filter = {
+      kinds: [pointer.kind],
+      authors: [pointer.pubkey],
+      '#d': [pointer.identifier]
+    }
+
+    const events = await lastValueFrom(
+      relayPool
+        .req(relays, filter)
+        .pipe(completeOnEose(), takeUntil(timer(5000)), toArray())
+    )
+
+    if (events.length === 0) {
+      return null
+    }
+
+    // Sort by created_at and take the most recent
+    events.sort((a, b) => b.created_at - a.created_at)
+    const article = events[0]
+
+    return getArticleTitle(article) || null
+  } catch (err) {
+    console.warn('Failed to fetch article title for', naddr, err)
+    return null
+  }
+}
+
+/**
+ * Fetch titles for multiple naddrs in parallel
+ * Returns a map of naddr -> title
+ */
+export async function fetchArticleTitles(
+  relayPool: RelayPool,
+  naddrs: string[]
+): Promise<Map<string, string>> {
+  const titleMap = new Map<string, string>()
+  
+  // Fetch all titles in parallel
+  const results = await Promise.allSettled(
+    naddrs.map(async (naddr) => {
+      const title = await fetchArticleTitle(relayPool, naddr)
+      return { naddr, title }
+    })
+  )
+
+  // Process results
+  results.forEach((result) => {
+    if (result.status === 'fulfilled' && result.value.title) {
+      titleMap.set(result.value.naddr, result.value.title)
+    }
+  })
+
+  return titleMap
+}
+

src/utils/nostrUriResolver.tsx

@@ -23,6 +23,21 @@ export function extractNostrUris(text: string): string[] {
   })
 }
 
+/**
+ * Extract all naddr (article) identifiers from text
+ */
+export function extractNaddrUris(text: string): string[] {
+  const allUris = extractNostrUris(text)
+  return allUris.filter(uri => {
+    try {
+      const decoded = decode(uri)
+      return decoded.type === 'naddr'
+    } catch {
+      return false
+    }
+  })
+}
+
 /**
  * Decode a NIP-19 identifier and return a human-readable link
  * For articles (naddr), returns an internal app link
@@ -99,6 +114,38 @@ export function replaceNostrUrisInMarkdown(markdown: string): string {
   })
 }
 
+/**
+ * Replace nostr: URIs in markdown with proper markdown links, using resolved titles for articles
+ * This converts: nostr:naddr1... to [Article Title](link)
+ * @param markdown The markdown content to process
+ * @param articleTitles Map of naddr -> title for resolved articles
+ */
+export function replaceNostrUrisInMarkdownWithTitles(
+  markdown: string, 
+  articleTitles: Map<string, string>
+): string {
+  return markdown.replace(NOSTR_URI_REGEX, (match) => {
+    // Extract just the NIP-19 identifier (without nostr: prefix)
+    const encoded = match.replace(/^nostr:/, '')
+    const link = createNostrLink(encoded)
+    
+    // For articles, use the resolved title if available
+    try {
+      const decoded = decode(encoded)
+      if (decoded.type === 'naddr' && articleTitles.has(encoded)) {
+        const title = articleTitles.get(encoded)!
+        return `[${title}](${link})`
+      }
+    } catch (error) {
+      // Ignore decode errors, fall through to default label
+    }
+    
+    // For other types or if title not resolved, use default label
+    const label = getNostrUriLabel(encoded)
+    return `[${label}](${link})`
+  })
+}
+
 /**
  * Replace nostr: URIs in HTML with clickable links
  * This is used when processing HTML content directly