a11y(web-dashboard): add aria labels, roles, and live regions to interactive components

- EmergencyControls: aria-label on all buttons and confirmation input
- OrderForm: aria-label and aria-pressed on buy/sell toggle buttons
- DashboardLayout: aria-label on navigation
- StatusBar: aria-live on connection status, aria-hidden on decorative indicator dot

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

web-dashboard/src/components/common/DashboardLayout.tsx

@@ -36,7 +36,7 @@ export function DashboardLayout({ children }: Props) {
   return (
     <div className="flex flex-col h-screen">
       {/* Top navigation */}
-      <nav className="flex items-center gap-1 px-4 py-2 bg-[var(--color-bg-secondary)] border-b border-[var(--color-border)]">
+      <nav aria-label="Dashboard navigation" className="flex items-center gap-1 px-4 py-2 bg-[var(--color-bg-secondary)] border-b border-[var(--color-border)]">
         <span className="text-sm font-bold text-[var(--color-accent)] mr-4">FOXHUNT</span>
         {NAV_ITEMS.map((item) => (
           <NavLink

web-dashboard/src/components/common/StatusBar.tsx

@@ -12,11 +12,12 @@ export function StatusBar() {
   return (
     <footer className="flex items-center justify-between px-4 py-1 text-xs bg-[var(--color-bg-secondary)] border-t border-[var(--color-border)] text-[var(--color-text-secondary)]">
       <div className="flex items-center gap-4">
-        <span className="flex items-center gap-1">
+        <span className="flex items-center gap-1" aria-live="polite">
           <span
             className={`inline-block w-2 h-2 rounded-full ${
               connected ? 'bg-[var(--color-green)]' : 'bg-[var(--color-red)]'
             }`}
+            aria-hidden="true"
           />
           WS: {connected ? 'Connected' : 'Disconnected'}
         </span>
@@ -29,6 +30,7 @@ export function StatusBar() {
         {authenticated && (
           <button
             onClick={logout}
+            aria-label="Sign out of the trading system"
             className="text-[var(--color-text-secondary)] hover:text-[var(--color-red)] transition-colors"
           >
             Sign Out

web-dashboard/src/components/risk/EmergencyControls.tsx

@@ -26,6 +26,7 @@ export function EmergencyControls() {
         {!showConfirm ? (
           <button
             onClick={() => setShowConfirm(true)}
+            aria-label="Trigger emergency stop — cancels all orders and closes all positions"
             className="w-full py-3 text-sm font-bold rounded bg-[var(--color-red)] text-white hover:bg-red-600 transition-colors"
           >
             EMERGENCY STOP
@@ -40,6 +41,7 @@ export function EmergencyControls() {
               value={confirmText}
               onChange={(e) => setConfirmText(e.target.value)}
               placeholder="Type STOP"
+              aria-label="Type STOP to confirm emergency shutdown"
               className="w-full px-2 py-1.5 text-sm rounded border border-[var(--color-red)] bg-[var(--color-bg-primary)] text-[var(--color-text-primary)] outline-none"
               autoFocus
             />
@@ -49,6 +51,7 @@ export function EmergencyControls() {
                   setShowConfirm(false);
                   setConfirmText('');
                 }}
+                aria-label="Cancel emergency stop"
                 className="py-1.5 text-xs rounded border border-[var(--color-border)] text-[var(--color-text-secondary)] hover:text-[var(--color-text-primary)]"
               >
                 Cancel
@@ -56,6 +59,7 @@ export function EmergencyControls() {
               <button
                 onClick={handleEmergencyStop}
                 disabled={confirmText !== 'STOP' || emergencyStop.isPending}
+                aria-label="Confirm emergency stop"
                 className="py-1.5 text-xs rounded bg-[var(--color-red)] text-white disabled:opacity-50"
               >
                 {emergencyStop.isPending ? 'Stopping...' : 'Confirm STOP'}

web-dashboard/src/components/trading/OrderForm.tsx

@@ -64,6 +64,8 @@ export function OrderForm() {
             <button
               type="button"
               onClick={() => setSide('buy')}
+              aria-label="Set order side to buy"
+              aria-pressed={side === 'buy'}
               className={`py-1.5 text-sm rounded font-medium transition-colors ${
                 side === 'buy'
                   ? 'bg-[var(--color-green)] text-white'
@@ -75,6 +77,8 @@ export function OrderForm() {
             <button
               type="button"
               onClick={() => setSide('sell')}
+              aria-label="Set order side to sell"
+              aria-pressed={side === 'sell'}
               className={`py-1.5 text-sm rounded font-medium transition-colors ${
                 side === 'sell'
                   ? 'bg-[var(--color-red)] text-white'