fix: match action button + close icon color to primary (price color); add shadow + backdrop blur to Alert

client/src/shared/ui/NotificationStack/NotificationStack.tsx

@@ -38,6 +38,8 @@ export function NotificationStack() {
               px: 2,
               py: 1.5,
               alignItems: 'center',
+              boxShadow: '0 4px 16px rgba(0,0,0,0.08)',
+              backdropFilter: 'blur(8px)',
               '& .MuiAlert-icon': {
                 py: 0.5,
                 mr: 1.5,
@@ -56,7 +58,7 @@ export function NotificationStack() {
                 ml: 1.5,
                 display: 'flex',
                 alignItems: 'center',
-                gap: 0.5,
+                gap: 1,
               },
             }}
             action={
@@ -76,7 +78,7 @@ export function NotificationStack() {
                       py: 0.5,
                       borderRadius: 8,
                       whiteSpace: 'nowrap',
-                      color: 'success.main',
+                      color: 'primary.main',
                       '&:hover': {
                         bgcolor: 'action.hover',
                       },
@@ -85,7 +87,11 @@ export function NotificationStack() {
                     {n.actionLabel}
                   </Button>
                 )}
-                <IconButton size="small" color="inherit" onClick={() => dismissNotification(n.id)}>
+                <IconButton
+                  size="small"
+                  onClick={() => dismissNotification(n.id)}
+                  sx={{ color: 'primary.main' }}
+                >
                   <CloseIcon fontSize="small" />
                 </IconButton>
               </>