fix(insights): a11y + UX Pro Max audit — accessible list view, reduced-motion, focus, lazy-load

Accessibility (CRITIQUE per UI/UX Pro Max skill):
- NetworkGraph Accessibility Grade D → added accessible List view alternative
  (toggle Graph/List with cluster→notes table, keyboard navigable)
- aria-label text summary on graph container for screen readers
- role=button + tabIndex + onKeyDown on bridge note cards (keyboard accessible)
- focus-visible:ring on all interactive cards (isolated clusters, bridges, list items)

UX (HIGH):
- prefers-reduced-motion: whileHover disabled when user prefers reduced motion
- cursor-pointer verified + focus-visible:ring-ochre on all clickable cards
- Mobile sidebar: hamburger Menu button in header (dispatches open-mobile-sidebar)

Performance (MEDIUM):
- NetworkGraph lazy-loaded via next/dynamic (D3 ~200KB deferred, ssr:false)
- Loading spinner shown while D3 chunk loads

i18n:
- listView, graphAriaLabel, listAriaLabel added to 15 locales

memento-note/locales/ar.json

@@ -3002,6 +3002,9 @@
       "scheduledCron": "مجدول",
       "lastSync": "آخر مزامنة"
     },
-    "resetFocus": "إعادة ضبط التركيز"
+    "resetFocus": "إعادة ضبط التركيز",
+    "listView": "List",
+    "graphAriaLabel": "Semantic network: {clusters} clusters, {notes} notes, {bridges} bridge notes. Switch to List view for accessible navigation.",
+    "listAriaLabel": "Accessible cluster list with notes and bridge connections"
   }
 }

memento-note/locales/de.json

@@ -3002,6 +3002,9 @@
       "scheduledCron": "Geplant",
       "lastSync": "Letzte Sync"
     },
-    "resetFocus": "Fokus zurücksetzen"
+    "resetFocus": "Fokus zurücksetzen",
+    "listView": "List",
+    "graphAriaLabel": "Semantic network: {clusters} clusters, {notes} notes, {bridges} bridge notes. Switch to List view for accessible navigation.",
+    "listAriaLabel": "Accessible cluster list with notes and bridge connections"
   }
 }

memento-note/locales/en.json

@@ -3532,7 +3532,10 @@
       "scheduledCron": "Scheduled",
       "lastSync": "Last sync"
     },
-    "resetFocus": "Reset focus"
+    "resetFocus": "Reset focus",
+    "listView": "List",
+    "graphAriaLabel": "Semantic network: {clusters} clusters, {notes} notes, {bridges} bridge notes. Switch to List view for accessible navigation.",
+    "listAriaLabel": "Accessible cluster list with notes and bridge connections"
   },
   "consent": {
     "banner": {

memento-note/locales/es.json

@@ -3002,6 +3002,9 @@
       "scheduledCron": "Programado",
       "lastSync": "Última sync"
     },
-    "resetFocus": "Restablecer enfoque"
+    "resetFocus": "Restablecer enfoque",
+    "listView": "List",
+    "graphAriaLabel": "Semantic network: {clusters} clusters, {notes} notes, {bridges} bridge notes. Switch to List view for accessible navigation.",
+    "listAriaLabel": "Accessible cluster list with notes and bridge connections"
   }
 }

memento-note/locales/fa.json

@@ -3041,6 +3041,9 @@
       "scheduledCron": "برنامه‌ریزی‌شده",
       "lastSync": "آخرین همگام‌سازی"
     },
-    "resetFocus": "بازنشانی تمرکز"
+    "resetFocus": "بازنشانی تمرکز",
+    "listView": "List",
+    "graphAriaLabel": "Semantic network: {clusters} clusters, {notes} notes, {bridges} bridge notes. Switch to List view for accessible navigation.",
+    "listAriaLabel": "Accessible cluster list with notes and bridge connections"
   }
 }

memento-note/locales/fr.json

@@ -3536,7 +3536,10 @@
       "scheduledCron": "CRON planifié",
       "lastSync": "Dernière synchro"
     },
-    "resetFocus": "Réinitialiser focus"
+    "resetFocus": "Réinitialiser focus",
+    "listView": "Liste",
+    "graphAriaLabel": "Réseau sémantique : {clusters} thèmes, {notes} notes, {bridges} notes-ponts. Basculez en vue Liste pour une navigation accessible.",
+    "listAriaLabel": "Liste accessible des clusters avec notes et connexions ponts"
   },
   "consent": {
     "banner": {

memento-note/locales/hi.json

@@ -3002,6 +3002,9 @@
       "scheduledCron": "अनुसूचित",
       "lastSync": "अंतिम सिंक"
     },
-    "resetFocus": "फोकस रीसेट करें"
+    "resetFocus": "फोकस रीसेट करें",
+    "listView": "List",
+    "graphAriaLabel": "Semantic network: {clusters} clusters, {notes} notes, {bridges} bridge notes. Switch to List view for accessible navigation.",
+    "listAriaLabel": "Accessible cluster list with notes and bridge connections"
   }
 }

memento-note/locales/it.json

@@ -3002,6 +3002,9 @@
       "scheduledCron": "Programmato",
       "lastSync": "Ultima sync"
     },
-    "resetFocus": "Reimposta focus"
+    "resetFocus": "Reimposta focus",
+    "listView": "List",
+    "graphAriaLabel": "Semantic network: {clusters} clusters, {notes} notes, {bridges} bridge notes. Switch to List view for accessible navigation.",
+    "listAriaLabel": "Accessible cluster list with notes and bridge connections"
   }
 }

memento-note/locales/ja.json

@@ -3002,6 +3002,9 @@
       "scheduledCron": "予定済み",
       "lastSync": "前回同期"
     },
-    "resetFocus": "フォーカス解除"
+    "resetFocus": "フォーカス解除",
+    "listView": "List",
+    "graphAriaLabel": "Semantic network: {clusters} clusters, {notes} notes, {bridges} bridge notes. Switch to List view for accessible navigation.",
+    "listAriaLabel": "Accessible cluster list with notes and bridge connections"
   }
 }

memento-note/locales/ko.json

@@ -3002,6 +3002,9 @@
       "scheduledCron": "예약됨",
       "lastSync": "마지막 동기화"
     },
-    "resetFocus": "포커스 해제"
+    "resetFocus": "포커스 해제",
+    "listView": "List",
+    "graphAriaLabel": "Semantic network: {clusters} clusters, {notes} notes, {bridges} bridge notes. Switch to List view for accessible navigation.",
+    "listAriaLabel": "Accessible cluster list with notes and bridge connections"
   }
 }

memento-note/locales/nl.json

@@ -3002,6 +3002,9 @@
       "scheduledCron": "Gepland",
       "lastSync": "Laatste sync"
     },
-    "resetFocus": "Focus resetten"
+    "resetFocus": "Focus resetten",
+    "listView": "List",
+    "graphAriaLabel": "Semantic network: {clusters} clusters, {notes} notes, {bridges} bridge notes. Switch to List view for accessible navigation.",
+    "listAriaLabel": "Accessible cluster list with notes and bridge connections"
   }
 }

memento-note/locales/pl.json

@@ -3002,6 +3002,9 @@
       "scheduledCron": "Zaplanowano",
       "lastSync": "Ostatnia sync"
     },
-    "resetFocus": "Resetuj fokus"
+    "resetFocus": "Resetuj fokus",
+    "listView": "List",
+    "graphAriaLabel": "Semantic network: {clusters} clusters, {notes} notes, {bridges} bridge notes. Switch to List view for accessible navigation.",
+    "listAriaLabel": "Accessible cluster list with notes and bridge connections"
   }
 }

memento-note/locales/pt.json

@@ -3002,6 +3002,9 @@
       "scheduledCron": "Programado",
       "lastSync": "Última sync"
     },
-    "resetFocus": "Repor foco"
+    "resetFocus": "Repor foco",
+    "listView": "List",
+    "graphAriaLabel": "Semantic network: {clusters} clusters, {notes} notes, {bridges} bridge notes. Switch to List view for accessible navigation.",
+    "listAriaLabel": "Accessible cluster list with notes and bridge connections"
   }
 }

memento-note/locales/ru.json

@@ -3002,6 +3002,9 @@
       "scheduledCron": "Запланировано",
       "lastSync": "Последняя sync"
     },
-    "resetFocus": "Сбросить фокус"
+    "resetFocus": "Сбросить фокус",
+    "listView": "List",
+    "graphAriaLabel": "Semantic network: {clusters} clusters, {notes} notes, {bridges} bridge notes. Switch to List view for accessible navigation.",
+    "listAriaLabel": "Accessible cluster list with notes and bridge connections"
   }
 }

memento-note/locales/zh.json

@@ -3002,6 +3002,9 @@
       "scheduledCron": "已计划",
       "lastSync": "上次同步"
     },
-    "resetFocus": "重置焦点"
+    "resetFocus": "重置焦点",
+    "listView": "List",
+    "graphAriaLabel": "Semantic network: {clusters} clusters, {notes} notes, {bridges} bridge notes. Switch to List view for accessible navigation.",
+    "listAriaLabel": "Accessible cluster list with notes and bridge connections"
   }
 }