🎨 Palette: Improve LoginPage accessibility

- Added aria-label and aria-pressed to the password visibility toggle in LoginPage.
- Added showPassword and hidePassword translations to both English and Chinese.
- Ensured changes are micro and focused on accessibility.

Co-authored-by: tinkle-community <240652709+tinkle-community@users.noreply.github.com>

web/src/components/LoginPage.tsx

@@ -334,6 +334,8 @@ export function LoginPage() {
                         type="button"
                         onClick={() => setShowPassword(!showPassword)}
                         className="absolute right-3 top-1/2 -translate-y-1/2 text-zinc-600 hover:text-zinc-400 transition-colors"
+                        aria-label={showPassword ? t('hidePassword', language) : t('showPassword', language)}
+                        aria-pressed={showPassword}
                       >
                         {showPassword ? <EyeOff size={16} /> : <Eye size={16} />}
                       </button>

web/src/i18n/translations.ts

@@ -667,6 +667,8 @@ export const translations = {
     passwordRequired: 'Password is required',
     invalidEmail: 'Invalid email format',
     passwordTooShort: 'Password must be at least 6 characters',
+    showPassword: 'Show password',
+    hidePassword: 'Hide password',
 
     // Landing Page
     features: 'Features',
@@ -1834,6 +1836,8 @@ export const translations = {
     passwordRequired: '请输入密码',
     invalidEmail: '邮箱格式不正确',
     passwordTooShort: '密码至少需要6个字符',
+    showPassword: '显示密码',
+    hidePassword: '隐藏密码',
 
     // Landing Page
     features: '功能',