refactor: increase min-height for grid cells in base styles (#10315)

Author: vursen

packages/crud/test/a11y.test.js

@@ -13,6 +13,16 @@ describe('a11y', () => {
     await setViewport({ width: 1024, height: 768 });
   });
 
+  beforeEach(() => {
+    fixtureSync(`
+      <style>
+        :root {
+          --vaadin-grid-row-border-width: 0px;
+        }
+      </style>
+    `);
+  });
+
   function focusRestorationTests(testId, createFixture) {
     describe(`focus restoration - ${testId}`, () => {
       let grid, form, dialog, newButton, saveButton, cancelButton, editButtons;

packages/grid/src/styles/vaadin-grid-base-styles.js

@@ -337,6 +337,7 @@ export const gridStyles = css`
     text-overflow: ellipsis;
     padding: var(--vaadin-grid-cell-padding, var(--vaadin-padding-container));
     flex: 1;
+    min-height: 1lh;
     min-width: 0;
   }