Make a dashboard its widgets: drop the pages and sections nobody drew

frontend/tests/editor.spec.ts

@@ -48,7 +48,7 @@ test.beforeAll(async ({ browser }) => {
   dashboard.columns = 12
   dashboard.canvas_width = 1920
   dashboard.canvas_height = 1080
-  dashboard.pages[0].sections[0].widgets = WIDGETS
+  dashboard.widgets = WIDGETS
   await api(page, `/dashboards/${dashboardName}`, {
     method: "PUT",
     data: dashboard,
@@ -65,7 +65,7 @@ async function placements(page: Page) {
   const doc = await (
     await api(page, `/dashboards/${dashboardName}?draft=true`)
   ).json()
-  const widgets = doc.pages[0].sections[0].widgets as {
+  const widgets = doc.widgets as {
     id: string
     layout: { lg: { x: number; y: number } }
   }[]

frontend/tests/endpoints.spec.ts

@@ -55,7 +55,7 @@ test.beforeAll(async ({ browser }) => {
   const dashboard = await (
     await api(page, `/dashboards/${dashboardName}`, { method: "POST" })
   ).json()
-  dashboard.pages[0].sections[0].widgets = [
+  dashboard.widgets = [
     {
       id: "lever",
       type: "slider",

frontend/tests/mobile.spec.ts

@@ -174,7 +174,7 @@ test.beforeAll(async ({ browser }) => {
   const dashboard = await (
     await api(page, `/dashboards/${dashboardName}`, { method: "POST" })
   ).json()
-  dashboard.pages[0].sections[0].widgets = [
+  dashboard.widgets = [
     {
       id: "top",
       type: "stat",

frontend/tests/panel.spec.ts

@@ -51,7 +51,7 @@ test.beforeAll(async ({ browser }) => {
     await api(page, `/dashboards/${name}`, { method: "POST" })
     const doc = await (await api(page, `/dashboards/${name}?draft=true`)).json()
     doc.settings = { look: { value: "glass" } }
-    doc.pages[0].sections[0].widgets = [
+    doc.widgets = [
       {
         id: "stat",
         type: "stat",

frontend/tests/widgets.spec.ts

@@ -89,7 +89,7 @@ test.beforeAll(async ({ browser }) => {
   // Two rows taller than the default panel: the tiles below already fill it,
   // and a widget past the last row is clipped rather than drawn.
   dashboard.canvas_height = 1400
-  dashboard.pages[0].sections[0].widgets = [
+  dashboard.widgets = [
     {
       id: "load",
       type: "bar",
@@ -202,7 +202,7 @@ test.beforeAll(async ({ browser }) => {
   const stack = await (
     await api(page, `/dashboards/${stackName}`, { method: "POST" })
   ).json()
-  stack.pages[0].sections[0].widgets = [
+  stack.widgets = [
     {
       id: "split",
       type: "bar",