feat: improve dapp accessibility

Docs/accessibility.md

@@ -0,0 +1,29 @@
+# ZCore dapp accessibility guidelines
+
+This checklist applies to the authenticated dapp in `Front/`.
+
+## Auth flows
+
+- Keep wallet connection controls keyboard reachable and give them explicit accessible names.
+- Announce wallet auth and signing errors with `role="alert"` and `aria-live="polite"`.
+- Preserve visible focus on CTA buttons, secondary links, and wallet switch controls.
+
+## Dashboard
+
+- Wrap dapp pages in the `DappShell` landmark so keyboard users can skip directly to content.
+- Expose credit score and tier progress with screen-reader labels, not only visual bars.
+- Keep score and tier text available as real text, not only icons or decorative graphics.
+
+## Visual checks
+
+- Text and badge contrast should meet WCAG 2.1 AA contrast for normal text.
+- Decorative grid, noise, and icons should be hidden from assistive technology with `aria-hidden`.
+- Each page should keep a logical heading order from page title to section content.
+
+## Local audit loop
+
+1. Start the dapp locally.
+2. Navigate `/login`, `/register`, and `/dashboard` using only the keyboard.
+3. Confirm the skip link appears on first tab focus.
+4. Confirm wallet auth errors are announced by a screen reader or browser accessibility tree.
+5. Run Lighthouse or axe on the scoped pages before opening a UI PR.

Front/components/connect-wallet-button.tsx

@@ -18,7 +18,13 @@ export function ConnectWalletButton({
 
   if (!isReady) {
     return (
-      <Button variant={variant} className={className} disabled>
+      <Button
+        variant={variant}
+        className={className}
+        disabled
+        aria-label="Loading available Stellar wallets"
+        aria-busy="true"
+      >
         <Loader2 className="mr-2 h-4 w-4 animate-spin" />
         Loading wallets...
       </Button>
@@ -27,7 +33,13 @@ export function ConnectWalletButton({
 
   if (address) {
     return (
-      <Button variant="outline" className={className} disabled>
+      <Button
+        variant="outline"
+        className={className}
+        disabled
+        aria-label={`Connected Stellar wallet ${walletName ?? "wallet"} ${address}`}
+        title={`Connected wallet ${address}`}
+      >
         <Wallet className="mr-2 h-4 w-4" />
         {walletName ? `${walletName}: ` : ""}
         {truncateWallet(address)}
@@ -41,6 +53,8 @@ export function ConnectWalletButton({
       className={className}
       onClick={() => connect()}
       disabled={isConnecting}
+      aria-label={isConnecting ? "Opening Stellar wallet selector" : "Connect Stellar wallet"}
+      aria-busy={isConnecting}
     >
       {isConnecting ? (
         <>

Front/components/dapp-shell.tsx

@@ -10,13 +10,21 @@ interface DappShellProps {
 export function DappShell({ children, className, withGrid = true }: DappShellProps) {
   return (
     <div className={cn("min-h-screen bg-black text-white relative", className)}>
+      <a
+        href="#main-content"
+        className="sr-only focus:not-sr-only focus:fixed focus:left-4 focus:top-4 focus:z-50 focus:bg-white focus:px-4 focus:py-2 focus:text-xs focus:font-bold focus:uppercase focus:tracking-zk focus:text-black"
+      >
+        Skip to content
+      </a>
       {withGrid && (
         <>
           <div className="pointer-events-none fixed inset-0 grid-bg opacity-30" aria-hidden />
           <div className="pointer-events-none fixed inset-0 bg-noise opacity-[0.04]" aria-hidden />
         </>
       )}
-      <div className="relative">{children}</div>
+      <main id="main-content" className="relative" tabIndex={-1}>
+        {children}
+      </main>
     </div>
   )
 }

Front/components/tier-badge.tsx

@@ -6,6 +6,7 @@ export function TierBadge({ tier, className }: { tier: string; className?: strin
 
   return (
     <span
+      aria-label={`Credit tier ${TIER_LABELS[key]}`}
       className={cn(
         "inline-flex items-center border px-3 py-1 text-[10px] font-bold uppercase tracking-zk",
         TIER_COLORS[key],

Front/components/tier-progress.tsx

@@ -18,6 +18,12 @@ export function TierProgress({
   pointsToNext,
   className,
 }: TierProgressProps) {
+  const tierLabel =
+    currentTier in TIER_LABELS ? TIER_LABELS[currentTier as ProfileTier] : currentTier
+  const progressLabel = nextTier
+    ? `${score} points, ${tierLabel} tier, ${pointsToNext} points to reach ${TIER_LABELS[nextTier]}`
+    : `${score} points, ${tierLabel} tier, maximum tier reached`
+
   return (
     <div className={cn("space-y-2", className)}>
       <div className="flex justify-between text-xs">
@@ -29,6 +35,11 @@ export function TierProgress({
       </div>
       <div className="h-1.5 w-full overflow-hidden bg-white/[0.06]">
         <div
+          role="progressbar"
+          aria-label={progressLabel}
+          aria-valuemin={0}
+          aria-valuemax={100}
+          aria-valuenow={Math.round(progress)}
           className="h-full bg-gradient-to-r from-neutral-600 via-white to-neutral-400 transition-all duration-500 shadow-[0_0_12px_rgba(255,255,255,0.15)]"
           style={{ width: `${progress}%` }}
         />

Front/components/wallet-auth-card.tsx

@@ -120,8 +120,14 @@ export function WalletAuthCard({ mode }: WalletAuthCardProps) {
         )}
 
         {error && (
-          <Alert variant="destructive" className="border-red-500/30 bg-red-500/10">
-            <XCircle className="h-4 w-4" />
+          <Alert
+            variant="destructive"
+            className="border-red-500/30 bg-red-500/10"
+            role="alert"
+            aria-live="polite"
+            aria-atomic="true"
+          >
+            <XCircle className="h-4 w-4" aria-hidden="true" />
             <AlertDescription>{error}</AlertDescription>
           </Alert>
         )}