feat(insights): fix DBSCAN, Persian embeddings crash, D3 physics layouts, and D3 node not found runtime error

memento-note/components/memory-echo-section.tsx

@@ -10,6 +10,9 @@ import { useLanguage } from '@/lib/i18n/LanguageProvider'
 import type { BlockSuggestion } from '@/components/block-picker'
 import { toast } from 'sonner'
 import { useNoteEditorContext } from '@/components/note-editor/note-editor-context'
+import { stripHtmlToPlainText } from '@/lib/text/plain-text'
+import { detectTextDirection } from '@/lib/clip/rtl-content'
+import { SEMANTIC_SIMILARITY_FLOOR_CLIP } from '@/lib/ai/semantic-proximity'
 
 interface ConnectionData {
   noteId: string
@@ -40,16 +43,16 @@ interface PreviewTarget {
   excerpt: string
 }
 
-function stripHtml(html: string): string {
-  return html.replace(/<[^>]+>/g, ' ').replace(/\s+/g, ' ').trim()
-}
-
 function excerpt(text: string, max = 150): string {
-  const plain = stripHtml(text)
+  const plain = stripHtmlToPlainText(text)
   if (plain.length <= max) return plain
   return `${plain.slice(0, max).trim()}…`
 }
 
+function isRtlText(text: string): boolean {
+  return detectTextDirection(text) === 'rtl'
+}
+
 async function resolveBlockForEmbed(sourceNoteId: string, hint: string): Promise<{ block: BlockSuggestion; mode: 'live' | 'citation' } | null> {
   const params = new URLSearchParams({ noteId: sourceNoteId, hint })
   const res = await fetch(`/api/blocks/resolve?${params}`)
@@ -155,7 +158,7 @@ export function MemoryEchoSection({
   useEffect(() => {
     if (isLoading || connections.length === 0) return
     const top = connections[0]
-    if (!top || top.similarity < 0.75) return
+    if (!top || top.similarity < SEMANTIC_SIMILARITY_FLOOR_CLIP) return
     const key = `memory-echo-scroll-${noteId}`
     if (sessionStorage.getItem(key)) return
     sessionStorage.setItem(key, '1')
@@ -167,7 +170,7 @@ export function MemoryEchoSection({
   const handleEmbed = useCallback(async (conn: ConnectionData) => {
     setEmbeddingId(conn.noteId)
     try {
-      const hint = excerpt(stripHtml(conn.content), 300)
+      const hint = (conn.content || '').trim().slice(0, 12000)
       const resolved = await resolveBlockForEmbed(conn.noteId, hint)
       const noteTitle = conn.title || t('memoryEcho.comparison.untitled')
 
@@ -200,7 +203,7 @@ export function MemoryEchoSection({
         return
       }
 
-      const citationText = stripHtml(
+      const citationText = stripHtmlToPlainText(
         resolved?.block.content || conn.content || hint
       ).slice(0, 1200)
 
@@ -213,7 +216,9 @@ export function MemoryEchoSection({
 
       if (editorCtx.state.isMarkdown) {
         const quoted = citationText.split('\n').map(line => `> ${line}`).join('\n')
-        const mdCitation = `\n\n${quoted}\n\n— [${noteTitle}](/home?openNote=${conn.noteId})\n`
+        const mdCitation = isRtlText(citationText)
+          ? `\n\n<div dir="rtl" lang="fa">\n\n${quoted}\n\n— [${noteTitle}](/home?openNote=${conn.noteId})\n\n</div>\n`
+          : `\n\n${quoted}\n\n— [${noteTitle}](/home?openNote=${conn.noteId})\n`
         editorCtx.actions.setContent(editorCtx.state.content + mdCitation)
         toast.success(t('memoryEcho.editorSection.citationSuccess'))
         return
@@ -326,7 +331,14 @@ export function MemoryEchoSection({
             </div>
           )}
 
-          <blockquote className="border-l-2 border-indigo-500/20 pl-3 font-serif italic text-sm leading-relaxed text-foreground/85">
+          <blockquote
+            className={cn(
+              'border-indigo-500/20 pl-3 font-serif italic text-sm leading-relaxed text-foreground/85',
+              isRtlText(topConnection.content) ? 'border-r-2 border-l-0 pr-3 pl-0 text-right' : 'border-l-2',
+            )}
+            dir={isRtlText(topConnection.content) ? 'rtl' : undefined}
+            lang={isRtlText(topConnection.content) ? 'fa' : undefined}
+          >
             « {excerpt(topConnection.content)} »
           </blockquote>