feat(ui): password strength meter with zxcvbn

Add PasswordStrengthMeter component showing visual bar and feedback.
Integrated in setup, settings change-password, and admin create-user forms.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

pnpm-lock.yaml

@@ -70,6 +70,9 @@ importers:
       uuid:
         specifier: ^11.1.0
         version: 11.1.0
+      zxcvbn:
+        specifier: ^4.4.2
+        version: 4.4.2
     devDependencies:
       '@playwright/test':
         specifier: ^1.58.2
@@ -3248,6 +3251,9 @@ packages:
   zimmerframe@1.1.4:
     resolution: {integrity: sha512-B58NGBEoc8Y9MWWCQGl/gq9xBCe4IiKM0a2x7GZdQKOW5Exr8S1W24J6OgM1njK8xCRGvAJIL/MxXHf6SkmQKQ==}
 
+  zxcvbn@4.4.2:
+    resolution: {integrity: sha512-Bq0B+ixT/DMyG8kgX2xWcI5jUvCwqrMxSFam7m0lAf78nf04hv6lNCsyLYdyYTrCVMqNDY/206K7eExYCeSyUQ==}
+
 snapshots:
 
   '@apideck/better-ajv-errors@0.3.6(ajv@8.18.0)':
@@ -6494,3 +6500,5 @@ snapshots:
   yaml@2.8.2: {}
 
   zimmerframe@1.1.4: {}
+
+  zxcvbn@4.4.2: {}