feat: add user preference for audio notifications and play sound on new alerts

- Added sound_enabled column to users table with a default of true.

- Implemented a pleasant pop sound (notification.mp3) that plays when a new unread notification arrives.

- Added a toggle in the User Profile page allowing users to enable/disable the sound.

backend/index.js

@@ -399,11 +399,11 @@ apiRouter.post('/users', requireRole(['admin', 'manager', 'super_admin']), async
 });
 
 apiRouter.put('/users/:id', async (req, res) => {
-  const { name, bio, role, team_id, status, email } = req.body;
+  const { name, bio, role, team_id, status, email, sound_enabled } = req.body;
   try {
     const [existing] = await pool.query('SELECT * FROM users WHERE id = ?', [req.params.id]);
     if (existing.length === 0) return res.status(404).json({ error: 'Not found' });
-    
+
     const isSelf = req.user.id === req.params.id;
     const isManagerOrAdmin = ['admin', 'owner', 'manager', 'super_admin'].includes(req.user.role);
 
@@ -419,6 +419,7 @@ apiRouter.put('/users/:id', async (req, res) => {
     const finalTeamId = isManagerOrAdmin && team_id !== undefined ? team_id : existing[0].team_id;
     const finalStatus = isManagerOrAdmin && status !== undefined ? status : existing[0].status;
     const finalEmail = email !== undefined ? email : existing[0].email;
+    const finalSoundEnabled = isSelf && sound_enabled !== undefined ? sound_enabled : (existing[0].sound_enabled ?? true);
 
     if (finalEmail !== existing[0].email) {
       const [emailCheck] = await pool.query('SELECT id FROM users WHERE email = ? AND id != ?', [finalEmail, req.params.id]);
@@ -426,12 +427,11 @@ apiRouter.put('/users/:id', async (req, res) => {
     }
 
     await pool.query(
-      'UPDATE users SET name = ?, bio = ?, email = ?, role = ?, team_id = ?, status = ? WHERE id = ?',
-      [name || existing[0].name, bio !== undefined ? bio : existing[0].bio, finalEmail, finalRole, finalTeamId || null, finalStatus, req.params.id]
+      'UPDATE users SET name = ?, bio = ?, email = ?, role = ?, team_id = ?, status = ?, sound_enabled = ? WHERE id = ?',
+      [name || existing[0].name, bio !== undefined ? bio : existing[0].bio, finalEmail, finalRole, finalTeamId || null, finalStatus, finalSoundEnabled, req.params.id]
     );
     res.json({ message: 'User updated successfully.' });
-  } catch (error) {
-    console.error('Update user error:', error);
+  } catch (error) {    console.error('Update user error:', error);
     res.status(500).json({ error: error.message });
   }
 });
@@ -510,6 +510,30 @@ apiRouter.put('/notifications/read-all', async (req, res) => {
   }
 });
 
+apiRouter.delete('/notifications/:id', async (req, res) => {
+  try {
+    await pool.query(
+      'DELETE FROM notifications WHERE id = ? AND user_id = ?',
+      [req.params.id, req.user.id]
+    );
+    res.json({ message: 'Notification deleted' });
+  } catch (error) {
+    res.status(500).json({ error: error.message });
+  }
+});
+
+apiRouter.delete('/notifications', async (req, res) => {
+  try {
+    await pool.query(
+      'DELETE FROM notifications WHERE user_id = ?',
+      [req.user.id]
+    );
+    res.json({ message: 'All notifications deleted' });
+  } catch (error) {
+    res.status(500).json({ error: error.message });
+  }
+});
+
 // --- Global Search ---
 apiRouter.get('/search', async (req, res) => {
   const { q } = req.query;
@@ -887,6 +911,13 @@ const provisionSuperAdmin = async (retries = 10, delay = 10000) => {
         console.log('Schema update note (populate slugs):', err.message);
       }
 
+      // Add sound_enabled column if it doesn't exist
+      try {
+        await connection.query('ALTER TABLE users ADD COLUMN sound_enabled BOOLEAN DEFAULT true');
+      } catch (err) {
+        if (err.code !== 'ER_DUP_FIELDNAME') console.log('Schema update note (sound_enabled):', err.message);
+      }
+
       // Update origin enum
       try {
         await connection.query("ALTER TABLE attendances MODIFY COLUMN origin ENUM('WhatsApp','Instagram','Website','LinkedIn','Indicação') NOT NULL");