fix(a11y): add focus management and ARIA attributes to dialogs

Adds role="dialog", aria-modal, focus trap, auto-focus close button,
and Escape key handling to ZapDialog and SettingsModal.

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

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

@@ -3,7 +3,13 @@
     <Transition name="settings-modal">
       <div
         v-if="open"
+        ref="dialogRef"
+        role="dialog"
+        aria-modal="true"
+        aria-label="Settings"
         class="fixed inset-0 z-50 flex items-center justify-center p-4"
+        @keydown.escape="$emit('update:open', false)"
+        @keydown.tab="trapFocus"
       >
         <div
           class="absolute inset-0 bg-black/70 backdrop-blur-sm"
@@ -15,6 +21,7 @@
           <div class="flex items-center justify-between">
             <h2 class="text-sm font-semibold text-white/96">Settings</h2>
             <button
+              ref="closeButtonRef"
               class="min-w-[44px] min-h-[44px] flex items-center justify-center rounded-lg text-white/40 hover:text-white/70 hover:bg-white/10 transition-all"
               aria-label="Close settings"
               @click="$emit('update:open', false)"
@@ -192,11 +199,11 @@
 </template>
 
 <script setup lang="ts">
-import { ref, computed, watch } from 'vue'
+import { ref, computed, watch, nextTick } from 'vue'
 import { useMemoryStore, type MemoryItem } from '@/stores/memory'
 import { useChatStore } from '@/stores/chat'
 
-defineProps<{
+const props = defineProps<{
   open: boolean
 }>()
 
@@ -204,6 +211,34 @@ defineEmits<{
   'update:open': [value: boolean]
 }>()
 
+const dialogRef = ref<HTMLElement | null>(null)
+const closeButtonRef = ref<HTMLElement | null>(null)
+
+function trapFocus(e: KeyboardEvent) {
+  const dialog = dialogRef.value
+  if (!dialog) return
+  const focusable = dialog.querySelectorAll<HTMLElement>(
+    'button, [href], input, select, textarea, [tabindex]:not([tabindex="-1"])'
+  )
+  if (focusable.length === 0) return
+  const first = focusable[0]
+  const last = focusable[focusable.length - 1]
+  if (e.shiftKey && document.activeElement === first) {
+    e.preventDefault()
+    last.focus()
+  } else if (!e.shiftKey && document.activeElement === last) {
+    e.preventDefault()
+    first.focus()
+  }
+}
+
+watch(() => props.open, async (isOpen) => {
+  if (isOpen) {
+    await nextTick()
+    closeButtonRef.value?.focus()
+  }
+})
+
 // --- Memory ---
 const memoryStore = useMemoryStore()
 const newMemoryText = ref('')

packages/app/src/components/content/ZapDialog.vue

@@ -1,15 +1,23 @@
 <template>
   <div
     v-if="isOpen"
+    ref="dialogRef"
+    role="dialog"
+    aria-modal="true"
+    aria-label="Send zap"
     class="fixed inset-0 z-50 flex items-center justify-center"
     @click.self="close"
+    @keydown.escape="close"
+    @keydown.tab="trapFocus"
   >
     <div class="absolute inset-0 bg-black/60 backdrop-blur-sm" @click="close" />
     <div class="relative glass-card w-[320px] max-w-[90vw] p-5 space-y-4 animate-scale-in">
       <div class="flex items-center justify-between">
         <h3 class="text-sm font-bold text-white/90">Zap</h3>
         <button
+          ref="closeButtonRef"
           class="min-w-[44px] min-h-[44px] flex items-center justify-center rounded text-white/40 hover:text-white/70 transition-colors"
+          aria-label="Close"
           @click="close"
         >
           <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
@@ -118,6 +126,9 @@ const props = defineProps<{
 
 const emit = defineEmits<{ close: [] }>()
 
+const dialogRef = ref<HTMLElement | null>(null)
+const closeButtonRef = ref<HTMLElement | null>(null)
+
 const amountPresets = [21, 100, 500, 1000, 5000, 10000]
 const amount = ref(21)
 const message = ref('')
@@ -216,8 +227,29 @@ function copyInvoice() {
   setTimeout(() => { copied.value = false }, 2000)
 }
 
-watch(() => props.isOpen, (open) => {
-  if (!open) {
+function trapFocus(e: KeyboardEvent) {
+  const dialog = dialogRef.value
+  if (!dialog) return
+  const focusable = dialog.querySelectorAll<HTMLElement>(
+    'button, [href], input, select, textarea, [tabindex]:not([tabindex="-1"])'
+  )
+  if (focusable.length === 0) return
+  const first = focusable[0]
+  const last = focusable[focusable.length - 1]
+  if (e.shiftKey && document.activeElement === first) {
+    e.preventDefault()
+    last.focus()
+  } else if (!e.shiftKey && document.activeElement === last) {
+    e.preventDefault()
+    first.focus()
+  }
+}
+
+watch(() => props.isOpen, async (open) => {
+  if (open) {
+    await nextTick()
+    closeButtonRef.value?.focus()
+  } else {
     invoice.value = ''
     error.value = ''
   }