feat(ui,api): update action buttons, password modal button, and dashboard user count

- Exclude hidden super administrator from dashboard active users count

- Rename UPDATE PASSWORD button to UPDATE in change password modal

- Use single-word labels and uniform dimensions for user profile action buttons

backend/src/controllers/dashboardController.js

@@ -12,7 +12,7 @@ exports.getStats = (req, res) => {
         let totalStudents;
         let completedDocuments;
         let missingDocuments;
-        const activeUsers = db.prepare('SELECT COUNT(*) as count FROM users WHERE is_active = 1').get().count;
+        const activeUsers = db.prepare('SELECT COUNT(*) as count FROM users WHERE is_active = 1 AND COALESCE(is_hidden, 0) = 0').get().count;
 
         // Resolve Active Academic Year
         const activeAy = db.prepare("SELECT * FROM academic_years WHERE status = 'active' LIMIT 1").get()