feat(chat): add AI memory panel with persistent facts (M9.7)

Collapsible memory panel below persona selector. Add/edit/delete
persistent facts (max 20) injected into every system prompt. Facts
stored in localStorage, shown as collapsed "Memory (N/20)" toggle.

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

packages/app/src/components/chat/ChatWindow.vue

@@ -21,6 +21,7 @@
     <ContextBar :messages="messages" />
 
     <PersonaSelector />
+    <MemoryPanel />
 
     <!-- Collapsed: prompt index -->
     <PromptIndex
@@ -119,6 +120,7 @@ import ChatSearch from './ChatSearch.vue'
 import ContextBar from './ContextBar.vue'
 import ComparisonView from './ComparisonView.vue'
 import PersonaSelector from './PersonaSelector.vue'
+import MemoryPanel from './MemoryPanel.vue'
 import ErrorBoundary from '@/components/ui/ErrorBoundary.vue'
 import type { Message, ImageAttachment } from '@aiui/core/types/message'
 

packages/app/src/components/chat/MemoryPanel.vue

@@ -0,0 +1,122 @@
+<template>
+  <div class="px-3 md:px-4 pb-1">
+    <!-- Collapsed toggle -->
+    <button
+      class="flex items-center gap-1.5 text-[11px] text-white/40 hover:text-white/60 transition-colors"
+      @click="isExpanded = !isExpanded"
+    >
+      <svg
+        class="w-3 h-3 transition-transform duration-200"
+        :class="isExpanded ? 'rotate-90' : ''"
+        fill="currentColor"
+        viewBox="0 0 20 20"
+      >
+        <path fill-rule="evenodd" d="M7.293 14.707a1 1 0 010-1.414L10.586 10 7.293 6.707a1 1 0 011.414-1.414l4 4a1 1 0 010 1.414l-4 4a1 1 0 01-1.414 0z" clip-rule="evenodd" />
+      </svg>
+      Memory ({{ memoryStore.items.length }}/20)
+    </button>
+
+    <!-- Expanded panel -->
+    <div v-if="isExpanded" class="mt-2 space-y-1.5 animate-fade-up-fast">
+      <div
+        v-for="item in memoryStore.items"
+        :key="item.id"
+        class="group flex items-start gap-2 rounded-lg bg-white/5 border border-white/5 px-2.5 py-1.5"
+      >
+        <div v-if="editingId === item.id" class="flex-1 flex gap-1.5">
+          <input
+            v-model="editText"
+            type="text"
+            class="flex-1 bg-transparent text-xs text-white/80 outline-none"
+            @keydown.enter="saveEdit(item.id)"
+            @keydown.escape="cancelEdit"
+          />
+          <button
+            class="text-[10px] text-accent/70 hover:text-accent"
+            @click="saveEdit(item.id)"
+          >
+            Save
+          </button>
+        </div>
+        <template v-else>
+          <p class="flex-1 text-xs text-white/60 leading-relaxed">{{ item.text }}</p>
+          <div class="shrink-0 flex gap-0.5 opacity-0 group-hover:opacity-100 transition-opacity">
+            <button
+              class="w-5 h-5 flex items-center justify-center rounded text-white/30 hover:text-white/60 hover:bg-white/10 transition-all"
+              title="Edit"
+              @click="startEdit(item)"
+            >
+              <svg class="w-3 h-3" viewBox="0 0 20 20" fill="currentColor"><path d="M13.586 3.586a2 2 0 112.828 2.828l-.793.793-2.828-2.828.793-.793zM11.379 5.793L3 14.172V17h2.828l8.38-8.379-2.83-2.828z" /></svg>
+            </button>
+            <button
+              class="w-5 h-5 flex items-center justify-center rounded text-white/30 hover:text-red-400/80 hover:bg-white/10 transition-all"
+              title="Delete"
+              @click="memoryStore.deleteItem(item.id)"
+            >
+              <svg class="w-3 h-3" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M6 18L18 6M6 6l12 12" />
+              </svg>
+            </button>
+          </div>
+        </template>
+      </div>
+
+      <!-- Add new -->
+      <div v-if="!memoryStore.isFull" class="flex gap-1.5">
+        <input
+          v-model="newText"
+          type="text"
+          class="flex-1 bg-white/5 border border-white/10 rounded-lg px-2.5 py-1.5 text-xs text-white/80 outline-none focus:border-accent/40 placeholder:text-white/25"
+          placeholder="Add a memory..."
+          @keydown.enter="addMemory"
+        />
+        <button
+          class="px-2.5 py-1.5 rounded-lg text-[11px] bg-accent/15 text-accent/80 hover:bg-accent/25 transition-all"
+          :disabled="!newText.trim()"
+          @click="addMemory"
+        >
+          Add
+        </button>
+      </div>
+      <p v-else class="text-[10px] text-white/25">
+        Maximum 20 memories reached
+      </p>
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { ref } from 'vue'
+import { useMemoryStore, type MemoryItem } from '@/stores/memory'
+
+const memoryStore = useMemoryStore()
+
+const isExpanded = ref(false)
+const newText = ref('')
+const editingId = ref<string | null>(null)
+const editText = ref('')
+
+function addMemory() {
+  if (!newText.value.trim()) return
+  memoryStore.addItem(newText.value)
+  newText.value = ''
+}
+
+function startEdit(item: MemoryItem) {
+  editingId.value = item.id
+  editText.value = item.text
+}
+
+function saveEdit(id: string) {
+  if (editText.value.trim()) {
+    memoryStore.updateItem(id, editText.value)
+  }
+  editingId.value = null
+  editText.value = ''
+}
+
+function cancelEdit() {
+  editingId.value = null
+  editText.value = ''
+}
+</script>

packages/app/src/composables/useAI.ts

@@ -4,6 +4,7 @@ import { searchWeb } from '@/composables/useWebSearch'
 import { getApiKey } from '@/utils/key-vault'
 import type { ImageAttachment } from '@aiui/core/types/message'
 import { usePersonaStore } from '@/stores/personas'
+import { useMemoryStore } from '@/stores/memory'
 
 type Provider = 'claude' | 'openrouter' | 'mock'
 
@@ -304,7 +305,7 @@ function formatWebSearchContext(results: { title: string; url: string; content?:
 - You MAY add [[podcast_ext:...]] or [[film_ext:...]] tags for "to learn more" recommendations after your answer.\n\n${lines.join('\n')}`
 }
 
-/** Build the system prompt, incorporating persona if active */
+/** Build the system prompt, incorporating persona and memory */
 function buildSystemPrompt(chatStore: ReturnType<typeof useChatStore>): string {
   let prompt = SYSTEM_PROMPT
 
@@ -318,6 +319,10 @@ function buildSystemPrompt(chatStore: ReturnType<typeof useChatStore>): string {
     }
   }
 
+  // Append memory facts
+  const memoryStore = useMemoryStore()
+  prompt += memoryStore.buildMemoryContext()
+
   if (chatStore.webSearchEnabled) {
     prompt += `
 

packages/app/src/stores/memory.ts

@@ -0,0 +1,85 @@
+import { defineStore } from 'pinia'
+import { ref, computed } from 'vue'
+
+export interface MemoryItem {
+  id: string
+  text: string
+}
+
+const STORAGE_KEY = 'aiui-memory'
+const MAX_ITEMS = 20
+
+function generateId(): string {
+  if (typeof crypto !== 'undefined' && typeof crypto.randomUUID === 'function') {
+    return crypto.randomUUID()
+  }
+  return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, (c) => {
+    const r = (Math.random() * 16) | 0
+    return (c === 'x' ? r : (r & 0x3) | 0x8).toString(16)
+  })
+}
+
+function loadFromStorage(): MemoryItem[] {
+  try {
+    const raw = localStorage.getItem(STORAGE_KEY)
+    if (!raw) return []
+    return JSON.parse(raw)
+  } catch {
+    return []
+  }
+}
+
+function saveToStorage(items: MemoryItem[]) {
+  localStorage.setItem(STORAGE_KEY, JSON.stringify(items))
+}
+
+export const useMemoryStore = defineStore('memory', () => {
+  const items = ref<MemoryItem[]>(loadFromStorage())
+
+  const isFull = computed(() => items.value.length >= MAX_ITEMS)
+
+  function persist() {
+    saveToStorage(items.value)
+  }
+
+  function addItem(text: string): MemoryItem | null {
+    if (items.value.length >= MAX_ITEMS) return null
+    const trimmed = text.trim()
+    if (!trimmed) return null
+    const item: MemoryItem = { id: generateId(), text: trimmed }
+    items.value.push(item)
+    persist()
+    return item
+  }
+
+  function updateItem(id: string, text: string) {
+    const item = items.value.find(x => x.id === id)
+    if (!item) return
+    item.text = text.trim()
+    persist()
+  }
+
+  function deleteItem(id: string) {
+    const idx = items.value.findIndex(x => x.id === id)
+    if (idx !== -1) {
+      items.value.splice(idx, 1)
+      persist()
+    }
+  }
+
+  /** Build the memory section for the system prompt */
+  function buildMemoryContext(): string {
+    if (items.value.length === 0) return ''
+    const facts = items.value.map(i => `- ${i.text}`).join('\n')
+    return `\n\n**User memory (always remember these facts):**\n${facts}`
+  }
+
+  return {
+    items,
+    isFull,
+    addItem,
+    updateItem,
+    deleteItem,
+    buildMemoryContext,
+  }
+})