refactor: update styles in MembersDirectory and NewsletterArchive for consistency and improved theming

- Updated color classes to use CSS variables for better maintainability and theming.
- Refactored component styles in MembersDirectory.js to enhance visual consistency.
- Adjusted loading states and empty states in NewsletterArchive.js for improved user experience.
- Added new brand colors to tailwind.config.js for future use.

src/components/ui/password-input.jsx

@@ -1,9 +1,9 @@
-import * as React from "react"
-import { Eye, EyeOff } from "lucide-react"
-import { cn } from "@/lib/utils"
+import * as React from "react";
+import { Eye, EyeOff } from "lucide-react";
+import { cn } from "@/lib/utils";
 
 const PasswordInput = React.forwardRef(({ className, ...props }, ref) => {
-  const [showPassword, setShowPassword] = React.useState(false)
+  const [showPassword, setShowPassword] = React.useState(false);
 
   return (
     <div className="relative">
@@ -19,7 +19,7 @@ const PasswordInput = React.forwardRef(({ className, ...props }, ref) => {
       <button
         type="button"
         onClick={() => setShowPassword(!showPassword)}
-        className="absolute right-3 top-1/2 -translate-y-1/2 text-[#6B708D] hover:text-[#3D405B] transition-colors focus:outline-none"
+        className="absolute right-3 top-1/2 -translate-y-1/2 text-var(--slate-muted) hover:text-var(--slate-dark) transition-colors focus:outline-none"
         tabIndex={-1}
       >
         {showPassword ? (
@@ -29,8 +29,8 @@ const PasswordInput = React.forwardRef(({ className, ...props }, ref) => {
         )}
       </button>
     </div>
-  )
-})
-PasswordInput.displayName = "PasswordInput"
+  );
+});
+PasswordInput.displayName = "PasswordInput";
 
-export { PasswordInput }
+export { PasswordInput };