Implement keyboard navigation using arrow keys in the whole application. (#2)

frontend/src/components/Modal.vue

@@ -1,5 +1,5 @@
 <template>
-  <div class="modal-overlay" @keydown.esc="$emit('close')" tabindex="-1">
+  <div class="modal-overlay" @keydown.esc="$emit('close')" @keydown="handleOverlayKeydown" tabindex="-1">
     <div class="modal" role="dialog" aria-modal="true">
       <slot />
     </div>
@@ -7,7 +7,130 @@
 </template>
 
 <script setup>
+import { ref, onMounted, onUnmounted, nextTick } from 'vue'
+import { navigateButtonRow, getDirection, focusPreferred, focusDialogDefault } from '@/utils/keynav'
+
+const props = defineProps({
+  // Optional: provide a fallback element to focus if original element is gone
+  focusFallback: { type: [HTMLElement, Object], default: null },
+  // Optional: index to help find next sibling when item is deleted
+  focusIndex: { type: Number, default: -1 },
+  // Optional: selector for finding siblings when restoring focus
+  focusSiblingSelector: { type: String, default: '' }
+})
+
 defineEmits(['close'])
+
+// Store the element that had focus before modal opened
+const previouslyFocusedElement = ref(null)
+
+/**
+ * Try to restore focus to the original element, or find a suitable fallback.
+ * Called on unmount to restore focus when modal closes.
+ */
+const restoreFocus = () => {
+  const prev = previouslyFocusedElement.value
+  if (!prev) return
+
+  // Check if the original element still exists in DOM and is focusable
+  if (document.body.contains(prev) && !prev.disabled) {
+    prev.focus()
+    return
+  }
+
+  // Original element is gone (deleted) - try to find a sibling
+  if (props.focusSiblingSelector && props.focusIndex >= 0) {
+    // Find container that has items matching the selector
+    const containers = [
+      props.focusFallback?.$el || props.focusFallback,
+      prev.closest('[data-nav-group]'),
+      prev.parentElement?.closest('section'),
+      document.querySelector('.view-root')
+    ].filter(Boolean)
+
+    for (const container of containers) {
+      if (!container) continue
+      const siblings = container.querySelectorAll(props.focusSiblingSelector)
+      if (siblings.length > 0) {
+        // Try to focus the next item, or the previous if we were at the end
+        const targetIndex = Math.min(props.focusIndex, siblings.length - 1)
+        const target = siblings[targetIndex]
+        if (target && !target.disabled) {
+          target.focus()
+          return
+        }
+      }
+    }
+  }
+
+  // Fall back to the provided fallback element
+  const fallback = props.focusFallback?.$el || props.focusFallback
+  if (fallback && document.body.contains(fallback)) {
+    const focusable = fallback.querySelector?.('button:not([disabled]), a, [tabindex="0"]') || fallback
+    if (focusable?.focus) {
+      focusable.focus()
+      return
+    }
+  }
+}
+
+const handleOverlayKeydown = (event) => {
+  const direction = getDirection(event)
+  if (!direction) return
+
+  // Check if we're in a modal-actions row
+  const target = event.target
+  const actionsRow = target.closest('.modal-actions')
+
+  if (actionsRow && (direction === 'left' || direction === 'right')) {
+    event.preventDefault()
+    navigateButtonRow(actionsRow, target, direction, { itemSelector: 'button' })
+  } else if (direction === 'up' && actionsRow) {
+    // From actions, try to go back to last input or focusable element in form
+    event.preventDefault()
+    const form = actionsRow.closest('form') || actionsRow.closest('.modal-form')
+    const inputs = form?.querySelectorAll('input, textarea, select, button:not(.modal-actions button)')
+    if (inputs && inputs.length > 0) {
+      inputs[inputs.length - 1].focus()
+    }
+  } else if (direction === 'down' && !actionsRow) {
+    // From an input, try to go to modal-actions
+    const form = target.closest('form') || target.closest('.modal-form')
+    if (form) {
+      event.preventDefault()
+      const actions = form.querySelector('.modal-actions')
+      if (actions) {
+        focusPreferred(actions, { primarySelector: '.btn-primary', itemSelector: 'button' })
+      }
+    }
+  }
+}
+
+onMounted(() => {
+  // Save currently focused element before modal takes focus
+  previouslyFocusedElement.value = document.activeElement
+
+  // Autofocus the most appropriate element:
+  // - For form dialogs (rename, edit): focus first input and select text
+  // - For other dialogs: focus primary button (or fallback)
+  nextTick(() => {
+    const modal = document.querySelector('.modal')
+    if (modal) {
+      // Mark primary button for keyboard navigation
+      const primaryBtn = modal.querySelector('.modal-actions .btn-primary')
+      if (primaryBtn) {
+        primaryBtn.setAttribute('data-nav-primary', '')
+      }
+      // Focus the most appropriate element
+      focusDialogDefault(modal)
+    }
+  })
+})
+
+onUnmounted(() => {
+  // Restore focus when modal closes
+  restoreFocus()
+})
 </script>
 
 <style scoped>