Refactor admin panel: enhance user management and security features

- Added role-based access control for user management links in admin navigation.
- Improved user account display with a dedicated account link.
- Implemented form submission confirmation for delete actions in the admin interface.
- Introduced a password visibility toggle on the login page.
- Added login throttling to prevent brute-force attacks, recording failed attempts.
- Created a CLI script for creating an admin user, replacing the previous hardcoded admin credentials.
- Updated database schema to support login attempt tracking.
- Enhanced user editing functionality, allowing role changes with restrictions.
- Improved modal handling for user actions, ensuring better focus management.
- Added styles for new account management page and improved modal transitions.

package.json

@@ -7,7 +7,7 @@
     "dev": "concurrently --kill-others-on-fail \"npm:dev:php\" \"npm:dev:sass\" \"npm:dev:browser\"",
     "dev:php": "php -S localhost:8000",
     "dev:sass": "sass --watch --source-map src/scss/styles.scss:styles.css",
-    "dev:browser": "browser-sync start --proxy http://localhost:8000 --files \"*.php,admin/**/*.php,inc/**/*.php,main.js,styles.css\" --no-open",
+    "dev:browser": "browser-sync start --proxy http://localhost:8000 --files \"*.php,admin/**/*.php,inc/**/*.php,main.js,styles.css\" --no-open --no-ui",
     "build:sass": "sass --no-source-map src/scss/styles.scss:styles.css",
     "dist": "npm run build:sass && node scripts/build-dist.js"
   },