feat(uat-batch-21): a11y — auth-page link contrast bumped past AA

`text-[#007bff] hover:underline` (light blue, 12-14px) was falling
below WCAG 1.4.3 AA contrast against the auth shell's white card.
Bumped to `text-[#0058b3]` (darker variant of the same hue) and
added `underline underline-offset-2 hover:no-underline` so the link
is always visibly underlined as a backup affordance.

Affects: /login, /reset-password, /set-password, /portal/login,
/portal/forgot-password, portal password-set-form. Button bg colors
(white-text on the same blue) are unchanged — those pass AA at
button sizes.

tsc clean. 1419/1419 vitest pass.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/app/(auth)/login/page.tsx

@@ -133,7 +133,10 @@ export default function LoginPage() {
         <div className="space-y-1.5">
           <div className="flex items-center justify-between">
             <Label htmlFor="password">Password</Label>
-            <Link href="/reset-password" className="text-xs text-[#007bff] hover:underline">
+            <Link
+              href="/reset-password"
+              className="text-xs text-[#0058b3] underline-offset-2 underline hover:no-underline"
+            >
               Forgot password?
             </Link>
           </div>

src/app/(auth)/reset-password/page.tsx

@@ -88,7 +88,10 @@ export default function ResetPasswordPage() {
             If an account exists for that email address, we have sent a password reset link. Please
             check your inbox and spam folder.
           </p>
-          <Link href="/login" className="inline-block text-sm text-[#007bff] hover:underline">
+          <Link
+            href="/login"
+            className="inline-block text-sm text-[#0058b3] underline-offset-2 underline hover:no-underline"
+          >
             Back to sign in
           </Link>
         </div>
@@ -118,7 +121,10 @@ export default function ResetPasswordPage() {
 
           <p className="text-center text-sm text-gray-500">
             Remember your password?{' '}
-            <Link href="/login" className="text-[#007bff] hover:underline">
+            <Link
+              href="/login"
+              className="text-[#0058b3] underline-offset-2 underline hover:no-underline"
+            >
               Sign in
             </Link>
           </p>

src/app/(auth)/set-password/page.tsx

@@ -120,7 +120,10 @@ function SetPasswordInner() {
             Please use the link from the email we sent you. If the link is broken, ask your
             administrator for a new one.
           </p>
-          <Link href="/login" className="inline-block text-sm text-[#007bff] hover:underline">
+          <Link
+            href="/login"
+            className="inline-block text-sm text-[#0058b3] underline-offset-2 underline hover:no-underline"
+          >
             Back to sign in
           </Link>
         </div>

src/app/(portal)/portal/forgot-password/page.tsx

@@ -44,7 +44,7 @@ export default function PortalForgotPasswordPage() {
           </p>
           <Link
             href="/portal/login"
-            className="mt-6 inline-block text-sm text-[#007bff] hover:underline"
+            className="mt-6 inline-block text-sm text-[#0058b3] underline-offset-2 underline hover:no-underline"
           >
             Back to sign in
           </Link>
@@ -95,7 +95,10 @@ export default function PortalForgotPasswordPage() {
 
         <p className="text-center text-sm text-gray-500">
           Remember your password?{' '}
-          <Link href="/portal/login" className="text-[#007bff] hover:underline">
+          <Link
+            href="/portal/login"
+            className="text-[#0058b3] underline-offset-2 underline hover:no-underline"
+          >
             Sign in
           </Link>
         </p>

src/app/(portal)/portal/login/page.tsx

@@ -91,7 +91,10 @@ export default function PortalLoginPage() {
         <div className="space-y-1.5">
           <div className="flex items-center justify-between">
             <Label htmlFor="password">Password</Label>
-            <Link href="/portal/forgot-password" className="text-xs text-[#007bff] hover:underline">
+            <Link
+              href="/portal/forgot-password"
+              className="text-xs text-[#0058b3] underline-offset-2 underline hover:no-underline"
+            >
               Forgot password?
             </Link>
           </div>

src/components/portal/password-set-form.tsx

@@ -128,7 +128,7 @@ export function PasswordSetForm({
           </p>
           <Link
             href="/portal/forgot-password"
-            className="inline-block text-sm text-[#007bff] hover:underline"
+            className="inline-block text-sm text-[#0058b3] underline-offset-2 underline hover:no-underline"
           >
             Request a new link
           </Link>
@@ -148,7 +148,7 @@ export function PasswordSetForm({
           <p className="text-gray-500 text-sm">{successDescription}</p>
           <Link
             href="/portal/login"
-            className="mt-6 inline-block text-sm text-[#007bff] hover:underline"
+            className="mt-6 inline-block text-sm text-[#0058b3] underline-offset-2 underline hover:no-underline"
           >
             Sign in
           </Link>