fix(ui): add sd-3 grid size of 16px to grid util

Author: psychedelicious

invokeai/frontend/web/src/features/parameters/util/optimalDimension.ts

@@ -24,14 +24,15 @@ export const getOptimalDimension = (base?: BaseModelType | null): number => {
 /**
  * Gets the grid size for a given base model. For Flux, the grid size is 16, otherwise it is 8.
  * - sd-1, sd-2, sdxl: 8
- * - flux: 16
+ * - flux, sd-3: 16
  * - default: 8
  * @param base The base model
  * @returns The grid size for the model, defaulting to 8
  */
 export const getGridSize = (base?: BaseModelType | null): number => {
   switch (base) {
     case 'flux':
+    case 'sd-3':
       return 16;
     case 'sd-1':
     case 'sd-2':