fix(days): align note time limit to 250 and keep toasts above modal blur (#1252)

The day-note 'time' field capped at 150 server-side while the dialog and shared schema allow 250, so 151-250 char notes 400'd with a confusing 'time must be 150...' message. Raise the controller and MCP limits to 250. Also lift the toast container above modal overlays so the error toast isn't rendered behind the modal's backdrop blur.

client/src/components/shared/Toast.tsx

@@ -102,7 +102,9 @@ export function ToastContainer() {
       `}</style>
       <div style={{
         position: 'fixed', bottom: 24, left: '50%', transform: 'translateX(-50%)',
-        zIndex: 9999, display: 'flex', flexDirection: 'column-reverse', gap: 8,
+        // Above modal overlays (which sit around z-index 10000 with a backdrop-filter
+        // blur) so error toasts paint on top and stay legible instead of blurred behind.
+        zIndex: 100000, display: 'flex', flexDirection: 'column-reverse', gap: 8,
         pointerEvents: 'none', maxWidth: 420, width: '100%', padding: '0 16px',
       }}>
         {toasts.map(toast => (