Add virtual grid provider coverage

continue.md

@@ -47,9 +47,11 @@ Actualizacion 2026-05-15:
   - Correccion VirtualList: la compensación de mediciones dinámicas sobre
     viewports internos pasa por `ActiveDom.scrollTo(...)` y usa
     `scrollOffset + delta` como fuente reactiva.
+  - Cobertura nueva para VirtualGrid: cálculo de ventana 2D y `scrollToCell`
+    via `ActiveDom`.
   - Validado por fase:
     - `npm run check` -> 0 errores, 0 warnings.
-    - `npm run test` -> 185 archivos, 2083 tests OK.
+    - `npm run test` -> 186 archivos, 2085 tests OK.
     - tests focales de Select/Popover/Toast/RangeCalendar -> 11 tests OK.
     - tests focales Dialog/Drawer/Popover/Select -> 10 tests OK.
     - `command-provider.svelte.test.ts` -> 2 tests OK.
@@ -63,6 +65,7 @@ Actualizacion 2026-05-15:
     - `date-range-field-provider.svelte.test.ts` -> 3 tests OK.
     - `date-field-provider.svelte.test.ts` -> 7 tests OK.
     - `virtual-list-provider.svelte.test.ts` -> 3 tests OK.
+    - `virtual-grid-provider.svelte.test.ts` -> 2 tests OK.
     - guardia `rg "from './.*provider\\.svelte'" src/uix/soma/components -g 'exports.ts'`
       -> solo queda `select/components/select-provider.svelte`, que es wrapper
       publico, no runtime provider.

src/uix/soma/SOMA_ARCHITECTURE.md

@@ -480,9 +480,11 @@ Los tests por componente estan creciendo desde las piezas de mayor riesgo. A
   orden/min/max, validación custom y foco de label via `ActiveDom`.
 - `virtual-list/virtual-list-provider.svelte.test.ts` — cálculo de ventana,
   `scrollToIndex` y compensación anti-jump via `ActiveDom`.
+- `virtual-grid/virtual-grid-provider.svelte.test.ts` — cálculo de ventana 2D
+  y `scrollToCell` via `ActiveDom`.
 
 Pendiente: seguir ampliando cobertura por familias de alto riesgo fuera del
-bloque fecha/hora/virtualización. `table-core`, `form-core` y el scorer de
+bloque fecha/hora y virtualización. `table-core`, `form-core` y el scorer de
 Command ya no viven dentro de Soma: se consumen desde `$libs/datagrid`,
 `$libs/forms` y `$libs/strings`.
 

src/uix/soma/components/virtual-grid/virtual-grid-provider.svelte.test.ts

@@ -0,0 +1,123 @@
+// @vitest-environment jsdom
+
+import { afterEach, describe, expect, it, vi } from 'vitest';
+
+import { createActiveDom } from '$adom';
+import { state } from '$libs/reactive';
+import type { Morfo } from '$uix/morfo';
+import { Soma } from '$soma/core/soma.svelte';
+import { createSomaRuntime, type SomaRuntimeSources } from '$soma/runtime.svelte';
+
+import { VirtualGridProvider } from './virtual-grid-provider.svelte';
+
+function withEffectRoot<T>(fn: () => T): { result: T; cleanup: () => void } {
+	let result!: T;
+	const cleanup = $effect.root(() => {
+		result = fn();
+	});
+	return { result, cleanup };
+}
+
+function installSomaHarness() {
+	const dom = createActiveDom();
+	const soma = {
+		dom,
+		runtime: (morfo: Morfo, sources: Omit<SomaRuntimeSources, 'dom' | 'eventEngine'>) =>
+			createSomaRuntime(morfo, {
+				dom,
+				translate: (key) => key,
+				...sources
+			})
+	} as unknown as Soma;
+
+	vi.spyOn(Soma, 'require').mockReturnValue(soma);
+	vi.spyOn(VirtualGridProvider.ctx, 'set').mockImplementation((value) => value);
+
+	return { dom };
+}
+
+function createVirtualGridOpts() {
+	return {
+		id: state('virtual-grid-root'),
+		ref: state<HTMLElement | null>(null),
+		rowCount: state(10),
+		columnCount: state(5),
+		rowSize: state(20),
+		columnSize: state(50),
+		rowOverscan: state(1),
+		columnOverscan: state(1),
+		getRowKey: state<(index: number) => string | number>((index) => `r${index}`),
+		getColumnKey: state<(index: number) => string | number>((index) => `c${index}`)
+	};
+}
+
+describe('VirtualGridProvider', () => {
+	afterEach(() => {
+		vi.restoreAllMocks();
+		document.body.innerHTML = '';
+	});
+
+	it('computes 2D virtual cells from viewport and overscan', () => {
+		const { dom } = installSomaHarness();
+		const opts = createVirtualGridOpts();
+
+		const { result: provider, cleanup } = withEffectRoot(() => VirtualGridProvider.create(opts));
+		provider.viewportHeight = 60;
+		provider.viewportWidth = 100;
+		provider.scrollTop = 30;
+		provider.scrollLeft = 55;
+
+		expect(provider.totalHeight).toBe(200);
+		expect(provider.totalWidth).toBe(250);
+		expect(provider.virtualCells).toHaveLength(30);
+		expect(provider.virtualCells[0]).toEqual({
+			rowIndex: 0,
+			columnIndex: 0,
+			rowStart: 0,
+			columnStart: 0,
+			rowSize: 20,
+			columnSize: 50,
+			key: 'r0|c0'
+		});
+		expect(provider.virtualCells.at(-1)).toEqual({
+			rowIndex: 5,
+			columnIndex: 4,
+			rowStart: 100,
+			columnStart: 200,
+			rowSize: 20,
+			columnSize: 50,
+			key: 'r5|c4'
+		});
+
+		cleanup();
+		dom.dispose();
+	});
+
+	it('routes scrollToCell through ActiveDom', () => {
+		const { dom } = installSomaHarness();
+		const opts = createVirtualGridOpts();
+		const viewport = document.createElement('div');
+		const scrollTo = vi.spyOn(dom, 'scrollTo');
+
+		const { result: provider, cleanup } = withEffectRoot(() => VirtualGridProvider.create(opts));
+		provider.viewportRef = viewport;
+		provider.viewportHeight = 100;
+		provider.viewportWidth = 100;
+		provider.scrollTop = 20;
+		provider.scrollLeft = 30;
+
+		provider.scrollToCell(6, 3, {
+			rowAlign: 'center',
+			columnAlign: 'center'
+		});
+
+		expect(scrollTo).toHaveBeenCalledWith(viewport, {
+			top: 80,
+			left: 125,
+			behavior: 'auto'
+		});
+
+		cleanup();
+		dom.dispose();
+	});
+});