feat: add generate strong password button to Add Members form

Add a "Generate strong password" button with Sparkles icon to the
Add Members form in Settings > People. Generated passwords are shown
in plain text with a copy button and an amber warning to copy before
creating the user. Also upgraded the button style on the change
password page to match. Translated copy/warning strings for all 21
locales.

Closes #139

packages/shared/src/i18n/ar.ts

@@ -1499,6 +1499,9 @@ export const ar: TranslationKeys = {
       resetPasswordAction: "إعادة تعيين كلمة المرور",
       deleteUserAction: "حذف المستخدم",
       saveButton: "حفظ",
+      copyPasswordButton: "نسخ كلمة المرور",
+      passwordCopied: "تم النسخ!",
+      copyPasswordWarning: "انسخ كلمة المرور الآن. لن تتمكن من رؤيتها بعد إنشاء المستخدم.",
     },
     teams: {
       heading: "الفرق",