Fix login form text contrast in dark mode

- Add explicit text-ink color to username/email/password input fields
- Add explicit bg-paper background class to inputs for proper styling
- Fixes visibility issue where input text was too light to read in dark mode
- Improves contrast and readability for both admin and customer login forms

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

src/app/account/login/page.tsx

@@ -32,7 +32,7 @@ export default function LoginPage({ searchParams }: { searchParams: { error?: st
           <label htmlFor="email" className="tag-label mb-2 block">
             Email
           </label>
-          <input id="email" name="email" type="email" required className="w-full border border-line px-3 py-2 text-sm" />
+          <input id="email" name="email" type="email" required className="w-full border border-line bg-paper px-3 py-2 text-sm text-ink" />
         </div>
         <div>
           <label htmlFor="password" className="tag-label mb-2 block">
@@ -43,7 +43,7 @@ export default function LoginPage({ searchParams }: { searchParams: { error?: st
             name="password"
             type="password"
             required
-            className="w-full border border-line px-3 py-2 text-sm"
+            className="w-full border border-line bg-paper px-3 py-2 text-sm text-ink"
           />
         </div>
         <button type="submit" className="bg-clay px-6 py-3 text-sm font-medium text-paper hover:bg-clay-dark">

src/app/admin/login/page.tsx

@@ -30,7 +30,7 @@ export default function AdminLoginPage({ searchParams }: { searchParams: { error
             name="username"
             required
             autoFocus
-            className="w-full border border-line px-3 py-2 text-sm"
+            className="w-full border border-line bg-paper px-3 py-2 text-sm text-ink"
           />
         </div>
         <div>
@@ -42,7 +42,7 @@ export default function AdminLoginPage({ searchParams }: { searchParams: { error
             name="password"
             type="password"
             required
-            className="w-full border border-line px-3 py-2 text-sm"
+            className="w-full border border-line bg-paper px-3 py-2 text-sm text-ink"
           />
         </div>
         <button type="submit" className="bg-clay px-6 py-3 text-sm font-medium text-paper hover:bg-clay-dark">