IFrame widget improvements (#15483)

changes - 
- make iframe side panel to match others -- ie use SidePanelHeader for
title
- make url optional in configuration to match that of the other widgets
(allow partial saves) - render No data status when error or no url
- split widget sizes into two -- graph widget sizes and widget sizes
(graph widgets are a subset of chart widgets)

packages/twenty-front/src/modules/page-layout/constants/GraphWidgetSizes.ts

@@ -0,0 +1,29 @@
+import { type WidgetSizeConfig } from '@/page-layout/types/WidgetSizeConfig';
+import { GraphType } from '~/generated-metadata/graphql';
+
+export const GRAPH_WIDGET_SIZES: Record<GraphType, WidgetSizeConfig> = {
+  [GraphType.AGGREGATE]: {
+    default: { w: 2, h: 2 },
+    minimum: { w: 2, h: 2 },
+  },
+  [GraphType.GAUGE]: {
+    default: { w: 3, h: 4 },
+    minimum: { w: 3, h: 4 },
+  },
+  [GraphType.PIE]: {
+    default: { w: 4, h: 4 },
+    minimum: { w: 3, h: 4 },
+  },
+  [GraphType.VERTICAL_BAR]: {
+    default: { w: 6, h: 6 },
+    minimum: { w: 4, h: 4 },
+  },
+  [GraphType.HORIZONTAL_BAR]: {
+    default: { w: 6, h: 6 },
+    minimum: { w: 4, h: 4 },
+  },
+  [GraphType.LINE]: {
+    default: { w: 6, h: 10 },
+    minimum: { w: 4, h: 4 },
+  },
+};