Harden Soma table pagination and pinning

src/uix/soma/components/table/table-core.svelte.test.ts

@@ -148,6 +148,32 @@ describe('createTable', () => {
 		}
 	});
 
+	it('normalizes invalid pagination state', () => {
+		const { table, cleanup } = withTable<Person>({
+			data: () => people,
+			columns,
+			pagination: { enabled: true },
+			initialPagination: { pageIndex: -4, pageSize: 0 }
+		});
+
+		try {
+			expect(table.pagination).toEqual({ pageIndex: 0, pageSize: 1 });
+			expect(table.pageCount).toBe(4);
+			expect(table.rows.map((row) => row.original.name)).toEqual(['Ada']);
+
+			table.setPageSize(2.8);
+			flushSync();
+			expect(table.pagination).toEqual({ pageIndex: 0, pageSize: 2 });
+			expect(table.pageCount).toBe(2);
+
+			table.setPageIndex(Number.POSITIVE_INFINITY);
+			flushSync();
+			expect(table.pagination.pageIndex).toBe(0);
+		} finally {
+			cleanup();
+		}
+	});
+
 	it('passes the source row index to accessor functions after sorting and pagination', () => {
 		const indexedColumns: ColumnDef<Person>[] = [
 			{
@@ -190,6 +216,11 @@ describe('createTable', () => {
 			expect(table.headers.map((header) => header.id)).toEqual(['name', 'status', 'score', 'age']);
 			expect(table.getPinnedOffset('name')).toBe(0);
 
+			table.pinColumn('status', 'left');
+			flushSync();
+			expect(table.headers.map((header) => header.id)).toEqual(['name', 'status', 'score', 'age']);
+			expect(table.getIsColumnPinned('status')).toBe(false);
+
 			table.pinColumn('score', 'left');
 			flushSync();
 			expect(table.headers.map((header) => header.id)).toEqual(['name', 'score', 'status', 'age']);

src/uix/soma/components/table/table-core.svelte.ts

@@ -220,13 +220,24 @@ function applyGlobalFilter<TData>(
 
 // ── Pagination logic ─────────────────────────────────────────────────────────
 
+function normalizePageSize(size: number): number {
+	if (!Number.isFinite(size)) return 1;
+	return Math.max(1, Math.floor(size));
+}
+
+function normalizePageIndex(index: number): number {
+	if (!Number.isFinite(index)) return 0;
+	return Math.max(0, Math.floor(index));
+}
+
 function applyPagination<TData>(
 	rows: IndexedRow<TData>[],
 	pagination: PaginationState | undefined
 ): IndexedRow<TData>[] {
 	if (!pagination) return rows;
-	const start = pagination.pageIndex * pagination.pageSize;
-	return rows.slice(start, start + pagination.pageSize);
+	const pageSize = normalizePageSize(pagination.pageSize);
+	const start = normalizePageIndex(pagination.pageIndex) * pageSize;
+	return rows.slice(start, start + pageSize);
 }
 
 // ── Table row/cell models ────────────────────────────────────────────────────
@@ -429,12 +440,12 @@ export function createTable<TData>(config: TableConfig<TData>): TableInstance<TD
 	let globalFilter = $state<string>(config.initialGlobalFilter ?? '');
 	let columnVisibility = $state<ColumnVisibilityState>(config.initialColumnVisibility ?? {});
 	let selection = $state<RowSelectionState>(config.initialSelection ?? {});
-	let pagination = $state<PaginationState>(
-		config.initialPagination ?? {
-			pageIndex: 0,
-			pageSize: config.pagination?.pageSize ?? 10
-		}
-	);
+	let pagination = $state<PaginationState>({
+		pageIndex: normalizePageIndex(config.initialPagination?.pageIndex ?? 0),
+		pageSize: normalizePageSize(
+			config.initialPagination?.pageSize ?? config.pagination?.pageSize ?? 10
+		)
+	});
 	let columnPinning = $state<ColumnPinningState>(config.initialColumnPinning ?? {});
 	let columnSizing = $state<ColumnSizingState>(config.initialColumnSizing ?? {});
 	let rowDetailOpen = $state<RowDetailState>(config.initialRowDetailOpen ?? {});
@@ -460,7 +471,7 @@ export function createTable<TData>(config: TableConfig<TData>): TableInstance<TD
 
 	const pageCount = $derived.by(() => {
 		if (!config.pagination?.enabled) return 1;
-		return Math.max(1, Math.ceil(totalRowCount / pagination.pageSize));
+		return Math.max(1, Math.ceil(totalRowCount / normalizePageSize(pagination.pageSize)));
 	});
 
 	const paginatedRows = $derived.by(() => {
@@ -712,13 +723,13 @@ export function createTable<TData>(config: TableConfig<TData>): TableInstance<TD
 	const canNextPage = $derived.by(() => pagination.pageIndex < pageCount - 1);
 
 	function setPageIndex(index: number) {
-		const clamped = Math.max(0, Math.min(index, pageCount - 1));
+		const clamped = Math.max(0, Math.min(normalizePageIndex(index), pageCount - 1));
 		pagination = { ...pagination, pageIndex: clamped };
 		config.onPaginationChange?.(pagination);
 	}
 
 	function setPageSize(size: number) {
-		pagination = { pageIndex: 0, pageSize: size };
+		pagination = { pageIndex: 0, pageSize: normalizePageSize(size) };
 		config.onPaginationChange?.(pagination);
 	}
 
@@ -739,7 +750,7 @@ export function createTable<TData>(config: TableConfig<TData>): TableInstance<TD
 
 	function pinColumn(columnId: string, position: ColumnPinningPosition) {
 		const col = resolvedColumns.find((c) => c.id === columnId);
-		if (!col || col.def.enablePinning === false) return;
+		if (!col || col.def.enablePinning !== true) return;
 		const left = (columnPinning.left ?? []).filter((id) => id !== columnId);
 		const right = (columnPinning.right ?? []).filter((id) => id !== columnId);
 		if (position === 'left') {