fix: add keyboard navigation to feedback type dropdown

Arrow keys open/navigate options, Enter/Space selects, Escape closes.
Added ARIA attributes (combobox, listbox, option) and click-outside
dismiss. Mouse hover also updates the highlight.

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

frontend/src/pages/FeedbackPage.tsx

@@ -1,4 +1,4 @@
-import { useState } from 'react'
+import { useState, useRef, useEffect } from 'react'
 import { MessageSquareText, Send, CheckCircle2, ChevronDown } from 'lucide-react'
 import { useAuthStore } from '@/store/authStore'
 import { feedbackApi } from '@/api'
@@ -26,6 +26,9 @@ export function FeedbackPage() {
   const [isSubmitting, setIsSubmitting] = useState(false)
   const [submitted, setSubmitted] = useState(false)
   const [typeDropdownOpen, setTypeDropdownOpen] = useState(false)
+  const [highlightedIndex, setHighlightedIndex] = useState(-1)
+  const triggerRef = useRef<HTMLButtonElement>(null)
+  const listboxRef = useRef<HTMLDivElement>(null)
 
   const canSubmit = email.trim() && feedbackType && message.trim().length >= 10
 
@@ -34,8 +37,70 @@ export function FeedbackPage() {
   const handleSelectType = (value: string) => {
     setFeedbackType(value)
     setTypeDropdownOpen(false)
+    setHighlightedIndex(-1)
+    triggerRef.current?.focus()
   }
 
+  const handleDropdownKeyDown = (e: React.KeyboardEvent) => {
+    switch (e.key) {
+      case 'ArrowDown':
+        e.preventDefault()
+        if (!typeDropdownOpen) {
+          setTypeDropdownOpen(true)
+          setHighlightedIndex(0)
+        } else {
+          setHighlightedIndex(i => (i + 1) % FEEDBACK_TYPES.length)
+        }
+        break
+      case 'ArrowUp':
+        e.preventDefault()
+        if (!typeDropdownOpen) {
+          setTypeDropdownOpen(true)
+          setHighlightedIndex(FEEDBACK_TYPES.length - 1)
+        } else {
+          setHighlightedIndex(i => (i - 1 + FEEDBACK_TYPES.length) % FEEDBACK_TYPES.length)
+        }
+        break
+      case 'Enter':
+      case ' ':
+        e.preventDefault()
+        if (typeDropdownOpen && highlightedIndex >= 0) {
+          handleSelectType(FEEDBACK_TYPES[highlightedIndex].value)
+        } else {
+          setTypeDropdownOpen(true)
+          setHighlightedIndex(0)
+        }
+        break
+      case 'Escape':
+        e.preventDefault()
+        setTypeDropdownOpen(false)
+        setHighlightedIndex(-1)
+        triggerRef.current?.focus()
+        break
+      case 'Tab':
+        if (typeDropdownOpen) {
+          setTypeDropdownOpen(false)
+          setHighlightedIndex(-1)
+        }
+        break
+    }
+  }
+
+  useEffect(() => {
+    if (!typeDropdownOpen) return
+    const handleClickOutside = (e: MouseEvent) => {
+      if (
+        triggerRef.current && !triggerRef.current.contains(e.target as Node) &&
+        listboxRef.current && !listboxRef.current.contains(e.target as Node)
+      ) {
+        setTypeDropdownOpen(false)
+        setHighlightedIndex(-1)
+      }
+    }
+    document.addEventListener('mousedown', handleClickOutside)
+    return () => document.removeEventListener('mousedown', handleClickOutside)
+  }, [typeDropdownOpen])
+
   const handleSubmit = async (e: React.FormEvent) => {
     e.preventDefault()
     if (!canSubmit || isSubmitting) return
@@ -119,8 +184,15 @@ export function FeedbackPage() {
               </label>
               <div className="relative">
                 <button
+                  ref={triggerRef}
                   type="button"
+                  role="combobox"
+                  aria-expanded={typeDropdownOpen}
+                  aria-haspopup="listbox"
+                  aria-controls="feedback-type-listbox"
+                  aria-activedescendant={highlightedIndex >= 0 ? `feedback-type-${highlightedIndex}` : undefined}
                   onClick={() => setTypeDropdownOpen(!typeDropdownOpen)}
+                  onKeyDown={handleDropdownKeyDown}
                   className={cn(
                     "w-full rounded-lg border border-border bg-card px-3 py-2 text-left flex items-center justify-between focus:border-primary focus:ring-1 focus:ring-primary/20 focus:outline-none",
                     feedbackType ? "text-foreground" : "text-muted-foreground"
@@ -130,15 +202,25 @@ export function FeedbackPage() {
                   <ChevronDown size={16} className={cn("transition-transform", typeDropdownOpen && "rotate-180")} />
                 </button>
                 {typeDropdownOpen && (
-                  <div className="absolute z-10 mt-1 w-full rounded-lg border border-border bg-card shadow-lg overflow-hidden">
-                    {FEEDBACK_TYPES.map(type => (
+                  <div
+                    ref={listboxRef}
+                    id="feedback-type-listbox"
+                    role="listbox"
+                    className="absolute z-10 mt-1 w-full rounded-lg border border-border bg-card shadow-lg overflow-hidden"
+                  >
+                    {FEEDBACK_TYPES.map((type, index) => (
                       <button
                         key={type.value}
+                        id={`feedback-type-${index}`}
                         type="button"
+                        role="option"
+                        aria-selected={feedbackType === type.value}
                         onClick={() => handleSelectType(type.value)}
+                        onMouseEnter={() => setHighlightedIndex(index)}
                         className={cn(
                           "w-full text-left px-3 py-2.5 hover:bg-accent transition-colors",
-                          feedbackType === type.value && "bg-accent"
+                          feedbackType === type.value && "bg-accent",
+                          highlightedIndex === index && feedbackType !== type.value && "bg-accent/50"
                         )}
                       >
                         <div className="text-sm font-medium text-foreground">{type.value}</div>