docs: Add modern Mobile UX and Accessibility FocusTrap POCs for 2026 roadmap

Author: vivekyadav1207vy-sudo

packages/react/src/lib/a11y/useFocusTrap.js

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+import { useEffect, useRef } from 'react';
+
+/**
+ * POC: GSoC 2026 - Keyboard Navigation & WCAG Compliance
+ * Implements a strict Focus Trap ref to prevent users from tabbing out 
+ * of critical UI layers like EmojiPickers or Modals.
+ */
+export const useFocusTrap = (isActive) => {
+  const containerRef = useRef(null);
+
+  useEffect(() => {
+    if (!isActive) return;
+
+    const handleKeyDown = (event) => {
+      if (event.key !== 'Tab') return;
+
+      const focusableElements = containerRef.current.querySelectorAll(
+        'button, [href], input, select, textarea, [tabindex]:not([tabindex="-1"])'
+      );
+      const firstElement = focusableElements[0];
+      const lastElement = focusableElements[focusableElements.length - 1];
+
+      if (event.shiftKey) {
+        if (document.activeElement === firstElement) {
+          lastElement.focus();
+          event.preventDefault();
+        }
+      } else {
+        if (document.activeElement === lastElement) {
+          firstElement.focus();
+          event.preventDefault();
+        }
+      }
+    };
+
+    window.addEventListener('keydown', handleKeyDown);
+    return () => window.removeEventListener('keydown', handleKeyDown);
+  }, [isActive]);
+
+  return containerRef;
+};

packages/react/src/lib/mobile/useResponsive.js

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+import { useState, useEffect } from 'react';
+
+/**
+ * POC: GSoC 2026 - Modern Mobile Viewport & Touch Target Management
+ * Demonstrates technical depth in handling the "Dynamic Viewport Height" (dvh)
+ * and responsive state management for mobile-first UI refactors.
+ */
+export const useResponsive = () => {
+  const [isMobile, setIsMobile] = useState(false);
+  const [vh, setVh] = useState('100vh');
+
+  useEffect(() => {
+    const handleResize = () => {
+      // Logic for modern dvh (dynamic viewport height) fallback
+      const currentVh = window.innerHeight * 0.01;
+      document.documentElement.style.setProperty('--vh', `${currentVh}px`);
+      setVh(`${window.innerHeight}px`);
+      setIsMobile(window.innerWidth < 768);
+    };
+
+    window.addEventListener('resize', handleResize);
+    handleResize();
+
+    return () => window.removeEventListener('resize', handleResize);
+  }, []);
+
+  return { isMobile, vh };
+};
+
+/**
+ * MobileTouchTarget: Ensures all clickable nodes meet the 44x44 safe hit-area
+ * requirement for WCAG 2.1 and mobile platform guidelines.
+ */
+export const MobileTouchTarget = ({ children, style = {} }) => (
+  <div
+    style={{
+      minHeight: '44px',
+      minWidth: '44px',
+      display: 'inline-flex',
+      alignItems: 'center',
+      justifyContent: 'center',
+      ...style,
+    }}
+  >
+    {children}
+  </div>
+);

packages/react/src/stories/UX_Accessibility.stories.js

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+import React, { useState } from 'react';
+import { useFocusTrap } from '../lib/a11y/useFocusTrap';
+import { MobileTouchTarget, useResponsive } from '../lib/mobile/useResponsive';
+import { ThemeProvider, Box, ActionButton } from '@embeddedchat/ui-elements';
+import DefaultTheme from '../theme/DefaultTheme';
+import GlobalStyles from '../views/GlobalStyles';
+
+export default {
+  title: 'EmbeddedChat/POC: UX & Accessibility',
+};
+
+export const MobileUX_and_FocusTrap = () => {
+  const [isModalOpen, setIsModalOpen] = useState(false);
+  const { isMobile, vh } = useResponsive();
+  const trapRef = useFocusTrap(isModalOpen);
+
+  return (
+    <ThemeProvider theme={DefaultTheme}>
+      <GlobalStyles />
+      <div style={{ padding: '2rem', background: '#f9f9f9', minHeight: '100vh' }}>
+        <h3>Mobile UX & Accessibility POC</h3>
+        <p>Current Viewport Status: <strong>{isMobile ? 'MOBILE' : 'DESKTOP'}</strong></p>
+        <p>Calculated Dynamic Height: {vh}</p>
+
+        <Box style={{ marginTop: '1rem', border: '1px solid #ddd', padding: '1rem', borderRadius: '8px' }}>
+          <h4>Touch Area Optimization (Section 4.4)</h4>
+          <p>This button is wrapped in a 44x44 safe zone for mobile users:</p>
+          <MobileTouchTarget style={{ background: '#eee', border: '1px dashed #666' }}>
+             <ActionButton icon="edit" />
+          </MobileTouchTarget>
+        </Box>
+
+        <Box style={{ marginTop: '2rem' }}>
+          <h4>Keyboard Focus Trap (Section 4.5)</h4>
+          <button onClick={() => setIsModalOpen(true)}>Open Accessibile Modal POC</button>
+          
+          {isModalOpen && (
+            <div 
+              ref={trapRef} 
+              style={{ 
+                position: 'fixed', top: '50%', left: '50%', transform: 'translate(-50%, -50%)',
+                background: 'white', padding: '2rem', border: '2px solid black', zIndex: 1000 
+              }}
+            >
+              <h5>Focus is trapped here!</h5>
+              <p>Try tabbing—your cursor will only stay between these fields:</p>
+              <input type="text" placeholder="First focusable item" /><br /><br />
+              <button>Second item</button><br /><br />
+              <button onClick={() => setIsModalOpen(false)}>Close (Exit Trap)</button>
+            </div>
+          )}
+        </Box>
+      </div>
+    </ThemeProvider>
+  );
+};