feat(web): TODO-003 accessibility focus trap + ARIA roles in modals

web/src/components/AlarmOverlay.tsx

@@ -1,8 +1,10 @@
 'use client';
 
+import { useEffect, useRef, useCallback } from 'react';
 import { useTimerStore } from '@/lib/store';
 import { getUrgencyConfig } from '@/lib/urgency';
 import { formatTime } from '@/lib/format';
+import { alertLabel } from '@bytelyst/accessibility';
 import { Bell, BellOff } from 'lucide-react';
 
 export function AlarmOverlay() {
@@ -11,15 +13,48 @@ export function AlarmOverlay() {
 
   const firingTimers = timers.filter((t) => t.state === 'firing');
 
+  const overlayRef = useRef<HTMLDivElement>(null);
+
+  const trapFocus = useCallback((e: KeyboardEvent) => {
+    if (e.key !== 'Tab' || !overlayRef.current) return;
+    const focusable = overlayRef.current.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();
+    }
+  }, []);
+
+  useEffect(() => {
+    if (firingTimers.length === 0) return;
+    document.addEventListener('keydown', trapFocus);
+    // Auto-focus dismiss button
+    const el = overlayRef.current?.querySelector<HTMLElement>('button');
+    el?.focus();
+    return () => document.removeEventListener('keydown', trapFocus);
+  }, [firingTimers.length, trapFocus]);
+
   if (firingTimers.length === 0) return null;
 
   // Show the most urgent firing timer
   const timer = firingTimers[0];
   const urgencyConfig = getUrgencyConfig(timer.urgency);
   const isCritical = timer.urgency === 'critical';
+  const a11yAlert = alertLabel(isCritical ? 'danger' : 'info', `Timer fired: ${timer.label}`);
 
   return (
-    <div className="fixed inset-0 z-[100] flex items-center justify-center">
+    <div
+      ref={overlayRef}
+      className="fixed inset-0 z-[100] flex items-center justify-center"
+      {...a11yAlert}
+    >
       {/* Backdrop */}
       <div
         className="absolute inset-0"
@@ -72,6 +107,7 @@ export function AlarmOverlay() {
           <div className="flex gap-3">
             <button
               onClick={() => snooze(timer.id, 5)}
+              aria-label="Snooze for 5 minutes"
               className="flex-1 py-3 rounded-xl text-sm font-medium transition-colors cursor-pointer flex items-center justify-center gap-2"
               style={{
                 backgroundColor: 'var(--cm-surface-card)',
@@ -83,6 +119,7 @@ export function AlarmOverlay() {
             </button>
             <button
               onClick={() => snooze(timer.id, 15)}
+              aria-label="Snooze for 15 minutes"
               className="flex-1 py-3 rounded-xl text-sm font-medium transition-colors cursor-pointer flex items-center justify-center gap-2"
               style={{
                 backgroundColor: 'var(--cm-surface-card)',
@@ -96,6 +133,7 @@ export function AlarmOverlay() {
 
           <button
             onClick={() => dismiss(timer.id)}
+            aria-label={`Dismiss ${timer.label} alarm`}
             className="w-full py-3 rounded-xl text-sm font-medium transition-colors cursor-pointer"
             style={{
               backgroundColor: isCritical ? urgencyConfig.color : 'var(--cm-critical-20)',

web/src/components/CreateTimerModal.tsx

@@ -1,6 +1,6 @@
 'use client';
 
-import { useState } from 'react';
+import { useState, useEffect, useRef, useCallback } from 'react';
 import { useTimerStore } from '@/lib/store';
 import { URGENCY_ORDER, getUrgencyConfig } from '@/lib/urgency';
 import type { UrgencyLevel } from '@/lib/urgency';
@@ -23,6 +23,33 @@ interface CreateTimerModalProps {
 export function CreateTimerModal({ isOpen, onClose }: CreateTimerModalProps) {
   const { addAlarm, addCountdown, addPomodoro, addEvent } = useTimerStore();
   const maintenanceMode = useMaintenanceMode();
+  const dialogRef = useRef<HTMLDivElement>(null);
+
+  const trapFocus = useCallback((e: KeyboardEvent) => {
+    if (e.key === 'Escape') { onClose(); return; }
+    if (e.key !== 'Tab' || !dialogRef.current) return;
+    const focusable = dialogRef.current.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();
+    }
+  }, [onClose]);
+
+  useEffect(() => {
+    if (!isOpen) return;
+    document.addEventListener('keydown', trapFocus);
+    const el = dialogRef.current?.querySelector<HTMLElement>('input, button');
+    el?.focus();
+    return () => document.removeEventListener('keydown', trapFocus);
+  }, [isOpen, trapFocus]);
 
   const [tab, setTab] = useState<TabType>('countdown');
   const [nlInput, setNlInput] = useState('');
@@ -215,6 +242,10 @@ export function CreateTimerModal({ isOpen, onClose }: CreateTimerModalProps) {
 
       {/* Modal */}
       <div
+        ref={dialogRef}
+        role="dialog"
+        aria-modal="true"
+        aria-label="Create new timer"
         className="relative w-full max-w-md mx-4 rounded-2xl border shadow-2xl overflow-hidden"
         style={{
           backgroundColor: 'var(--cm-bg-elevated)',