feat(office): table detail panes and Alt+1/2/3 layout toggles

Add spreadsheet-style list, split detail pane with forms and document preview,
and Alt+1/2/3 to show/hide panes with even width distribution.

Co-authored-by: Cursor <cursoragent@cursor.com>

cmd/office/ui/table_test.go

@@ -0,0 +1,98 @@
+package ui
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/eslider/go-onlyoffice/cmd/office/model"
+)
+
+func sampleItems() []model.Item {
+	return []model.Item{
+		{ID: "2", Title: "Bravo", Subtitle: "b", Kind: model.KindTask, Raw: map[string]any{"status": "Open"}},
+		{ID: "1", Title: "Alpha", Subtitle: "a", Kind: model.KindTask, Raw: map[string]any{"status": "Done"}},
+	}
+}
+
+func TestDataTableSortByTitle(t *testing.T) {
+	tbl := newDataTable()
+	tbl.SetSize(80, 12)
+	tbl.SetData(model.ListSpec{Subject: model.SubjectTasks}, sampleItems())
+	tbl.cursorCol = indexOfColumn(tbl, "title")
+	tbl.ToggleSort()
+	if model.CellText(tbl.items[tbl.order[0]], "title") != "Alpha" {
+		t.Fatalf("expected Alpha first after sort, order=%v", tbl.order)
+	}
+}
+
+func TestDataTableMoveColScrolls(t *testing.T) {
+	tbl := newDataTable()
+	tbl.SetSize(24, 10)
+	items := make([]model.Item, 1)
+	items[0] = model.Item{ID: "1", Title: "One", Raw: map[string]any{
+		"alpha": "a", "beta": "b", "gamma": "c", "delta": "d",
+	}}
+	tbl.SetData(model.ListSpec{Subject: model.SubjectTasks}, items)
+	last := len(tbl.columns) - 1
+	tbl.cursorCol = last
+	tbl.ensureColVisible()
+	if tbl.colScroll == 0 && last > 2 {
+		t.Fatalf("expected horizontal scroll for wide table, colScroll=%d", tbl.colScroll)
+	}
+}
+
+func TestDataTableViewHighlightsActiveCell(t *testing.T) {
+	tbl := newDataTable()
+	tbl.SetSize(80, 12)
+	tbl.SetFocused(true)
+	tbl.SetData(model.ListSpec{Subject: model.SubjectTasks}, sampleItems())
+	tbl.cursorRow = 1
+	tbl.cursorCol = 2
+	view := tbl.View()
+	if !strings.Contains(view, "Alpha") {
+		t.Fatal("view missing row data")
+	}
+	if !strings.Contains(view, "Title") {
+		t.Fatal("view missing header")
+	}
+}
+
+func TestDataTableFillsPaneWidth(t *testing.T) {
+	tbl := newDataTable()
+	tbl.SetSize(80, 12)
+	tbl.SetData(model.ListSpec{Subject: model.SubjectTasks}, sampleItems())
+	indices, widths := tbl.visibleLayout()
+	sum := 0
+	for _, i := range indices {
+		sum += widths[i]
+	}
+	if sum != 80 {
+		t.Fatalf("visible columns width sum=%d want 80", sum)
+	}
+}
+
+func TestDistributeColumnWidthsFillsTotal(t *testing.T) {
+	cols := []model.TableColumn{
+		{Key: "_sel", Width: 3},
+		{Key: "id", Width: 10},
+		{Key: "title", Width: 20},
+	}
+	indices := []int{0, 1, 2}
+	w := distributeColumnWidths(33, 80, indices, cols)
+	sum := w[0] + w[1] + w[2]
+	if sum != 80 {
+		t.Fatalf("sum=%d want 80", sum)
+	}
+	if w[2] <= 20 {
+		t.Fatalf("title should expand, got %d", w[2])
+	}
+}
+
+func indexOfColumn(tbl DataTable, key string) int {
+	for i, c := range tbl.columns {
+		if c.Key == key {
+			return i
+		}
+	}
+	return 0
+}