chore: clean .gitignore cache

frontend/src/utils/passwordStrength.ts

@@ -0,0 +1,80 @@
+export interface PasswordStrength {
+  score: number; // 0-4
+  label: string;
+  color: string; // Tailwind color class prefix (e.g., 'red', 'yellow', 'green')
+  feedback: string[];
+}
+
+export function calculatePasswordStrength(password: string): PasswordStrength {
+  let score = 0;
+  const feedback: string[] = [];
+
+  if (!password) {
+    return {
+      score: 0,
+      label: 'Empty',
+      color: 'gray',
+      feedback: [],
+    };
+  }
+
+  // Length check
+  if (password.length < 8) {
+    feedback.push('Too short (min 8 chars)');
+  } else {
+    score += 1;
+  }
+
+  if (password.length >= 12) {
+    score += 1;
+  }
+
+  // Complexity checks
+  const hasLower = /[a-z]/.test(password);
+  const hasUpper = /[A-Z]/.test(password);
+  const hasNumber = /\d/.test(password);
+  const hasSpecial = /[^A-Za-z0-9]/.test(password);
+
+  const varietyCount = [hasLower, hasUpper, hasNumber, hasSpecial].filter(Boolean).length;
+
+  if (varietyCount >= 3) {
+    score += 1;
+  }
+  if (varietyCount === 4) {
+    score += 1;
+  }
+
+  // Penalties
+  if (varietyCount < 2 && password.length >= 8) {
+    feedback.push('Add more variety (uppercase, numbers, symbols)');
+  }
+
+  // Cap score at 4
+  score = Math.min(score, 4);
+
+  // Determine label and color
+  let label = 'Very Weak';
+  let color = 'red';
+
+  switch (score) {
+    case 0:
+    case 1:
+      label = 'Weak';
+      color = 'red';
+      break;
+    case 2:
+      label = 'Fair';
+      color = 'yellow';
+      break;
+    case 3:
+      label = 'Good';
+      color = 'green';
+      break;
+    case 4:
+      label = 'Strong';
+      color = 'green';
+      break;
+  }
+
+  return { score, label, color, feedback };
+}