Fix WebSocket authentication and duplicate filters

- Remove mock authentication from authSlice to enable real user login
- Fix WebSocket connection errors by using real JWT tokens
- Consolidate duplicate filters on insights page into single shared filter
- Update InsightsDashboard to accept props instead of managing own state
- Add MUI Grid styling for 20% min-width and centering
- Improve UX with unified filter controls for both insights and predictions

maternal-web/app/globals.css

@@ -165,3 +165,23 @@ body {
   outline: 2px solid #FF8B7D;
   outline-offset: 2px;
 }
+
+/* ============================================
+   MUI Grid Custom Styling
+   ============================================ */
+
+/* MUI Grid minimum width and centering */
+.mui-17fpwt7-MuiGrid-root {
+  min-width: 20% !important;
+}
+
+/* Center MUI Grid containers and items */
+.MuiGrid-container {
+  justify-content: center !important;
+}
+
+.MuiGrid-item {
+  display: flex !important;
+  justify-content: center !important;
+  align-items: center !important;
+}