feat(ui): improve password validation display with detailed requirements

- Enhance PasswordStrengthIndicator with visual checkmarks for each requirement
- Add explicit validation for uppercase, lowercase, and number requirements
- Show clear pass/fail indicators (CheckCircle/XCircle icons) for each criterion
- Add front-end validation matching production password policy
- Display specific error messages listing all missing requirements
- Align with production standards (8+ chars, uppercase, lowercase, number)

frontend/src/components/common/PasswordStrengthIndicator.jsx

@@ -1,24 +1,37 @@
 import { useMemo } from 'react';
+import { CheckCircle, XCircle } from 'lucide-react';
 
 /**
  * Password Strength Indicator Component
  * Calculates and displays password strength with visual feedback
+ * Shows requirements based on production environment standards
  */
 const PasswordStrengthIndicator = ({ password }) => {
+  const requirements = useMemo(() => {
+    const checks = {
+      minLength: password.length >= 8,
+      hasUppercase: /[A-Z]/.test(password),
+      hasLowercase: /[a-z]/.test(password),
+      hasNumber: /[0-9]/.test(password),
+    };
+
+    return checks;
+  }, [password]);
+
   const strength = useMemo(() => {
     if (!password) return { score: 0, label: '', color: '' };
 
     let score = 0;
 
-    // Length check
-    if (password.length >= 8) score++;
-    if (password.length >= 12) score++;
+    // Count met requirements (production standards)
+    if (requirements.minLength) score++;
+    if (requirements.hasUppercase) score++;
+    if (requirements.hasLowercase) score++;
+    if (requirements.hasNumber) score++;
 
-    // Character variety checks
-    if (/[a-z]/.test(password)) score++; // lowercase
-    if (/[A-Z]/.test(password)) score++; // uppercase
-    if (/[0-9]/.test(password)) score++; // numbers
-    if (/[^a-zA-Z0-9]/.test(password)) score++; // special chars
+    // Bonus points for extra length and special chars
+    if (password.length >= 12) score++;
+    if (/[^a-zA-Z0-9]/.test(password)) score++;
 
     // Determine label and color
     if (score <= 2) {
@@ -28,7 +41,13 @@ const PasswordStrengthIndicator = ({ password }) => {
     } else {
       return { score, label: 'Strong', color: 'bg-green-500' };
     }
-  }, [password]);
+  }, [password, requirements]);
+
+  // Check if all required criteria are met
+  const allRequirementsMet = requirements.minLength &&
+                            requirements.hasUppercase &&
+                            requirements.hasLowercase &&
+                            requirements.hasNumber;
 
   if (!password) return null;
 
@@ -52,17 +71,56 @@ const PasswordStrengthIndicator = ({ password }) => {
           style={{ width: `${widthPercentage}%` }}
         />
       </div>
-      <ul className="mt-2 text-xs text-gray-600 space-y-1">
-        <li className={password.length >= 8 ? 'text-green-600' : ''}>
-          ✓ At least 8 characters
-        </li>
-        <li className={/[A-Z]/.test(password) && /[a-z]/.test(password) ? 'text-green-600' : ''}>
-          ✓ Upper and lowercase letters
-        </li>
-        <li className={/[0-9]/.test(password) ? 'text-green-600' : ''}>
-          ✓ At least one number
-        </li>
-      </ul>
+      <div className="mt-2 space-y-1">
+        <p className="text-xs font-medium text-gray-700 mb-1.5">Password requirements:</p>
+        <ul className="space-y-1">
+          <li className="flex items-center gap-1.5 text-xs">
+            {requirements.minLength ? (
+              <CheckCircle className="w-4 h-4 text-green-600 flex-shrink-0" />
+            ) : (
+              <XCircle className="w-4 h-4 text-gray-400 flex-shrink-0" />
+            )}
+            <span className={requirements.minLength ? 'text-green-600' : 'text-gray-600'}>
+              At least 8 characters
+            </span>
+          </li>
+          <li className="flex items-center gap-1.5 text-xs">
+            {requirements.hasUppercase ? (
+              <CheckCircle className="w-4 h-4 text-green-600 flex-shrink-0" />
+            ) : (
+              <XCircle className="w-4 h-4 text-gray-400 flex-shrink-0" />
+            )}
+            <span className={requirements.hasUppercase ? 'text-green-600' : 'text-gray-600'}>
+              At least one uppercase letter (A-Z)
+            </span>
+          </li>
+          <li className="flex items-center gap-1.5 text-xs">
+            {requirements.hasLowercase ? (
+              <CheckCircle className="w-4 h-4 text-green-600 flex-shrink-0" />
+            ) : (
+              <XCircle className="w-4 h-4 text-gray-400 flex-shrink-0" />
+            )}
+            <span className={requirements.hasLowercase ? 'text-green-600' : 'text-gray-600'}>
+              At least one lowercase letter (a-z)
+            </span>
+          </li>
+          <li className="flex items-center gap-1.5 text-xs">
+            {requirements.hasNumber ? (
+              <CheckCircle className="w-4 h-4 text-green-600 flex-shrink-0" />
+            ) : (
+              <XCircle className="w-4 h-4 text-gray-400 flex-shrink-0" />
+            )}
+            <span className={requirements.hasNumber ? 'text-green-600' : 'text-gray-600'}>
+              At least one number (0-9)
+            </span>
+          </li>
+        </ul>
+      </div>
+      {!allRequirementsMet && password.length > 0 && (
+        <p className="mt-2 text-xs text-red-600">
+          Please meet all requirements above
+        </p>
+      )}
     </div>
   );
 };

frontend/src/pages/RegisterPage.jsx

@@ -174,14 +174,29 @@ const RegisterPage = () => {
     e.preventDefault();
     setError('');
 
-    // Validation
+    // Validation - passwords match
     if (formData.password !== formData.confirmPassword) {
       setError('Passwords do not match');
       return;
     }
 
+    // Validation - password requirements (production standards)
+    const passwordErrors = [];
     if (formData.password.length < 8) {
-      setError('Password must be at least 8 characters long');
+      passwordErrors.push('at least 8 characters');
+    }
+    if (!/[A-Z]/.test(formData.password)) {
+      passwordErrors.push('one uppercase letter');
+    }
+    if (!/[a-z]/.test(formData.password)) {
+      passwordErrors.push('one lowercase letter');
+    }
+    if (!/[0-9]/.test(formData.password)) {
+      passwordErrors.push('one number');
+    }
+
+    if (passwordErrors.length > 0) {
+      setError(`Password must contain ${passwordErrors.join(', ')}`);
       return;
     }