feat(office): mail preview, infinite scroll, pane resize, and scrollbars

Polish the office TUI with proportional pane layout, drag resize, live
filtering, HTML mail preview, paginated mail lists, overflow scrollbars,
flattened navigation, and project save/status fixes; add UpdateProjectStatus.

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

cmd/office/ui/table_append_test.go

@@ -0,0 +1,40 @@
+package ui
+
+import (
+	"testing"
+
+	"github.com/eslider/go-onlyoffice/cmd/office/model"
+)
+
+func TestDataTableAppendItemsDedupes(t *testing.T) {
+	tbl := newDataTable()
+	tbl.SetSize(40, 10)
+	tbl.SetData(model.ListSpec{Subject: model.SubjectMailInbox}, []model.Item{
+		{ID: "1", Title: "A", Kind: model.KindMail},
+	})
+	added := tbl.AppendItems([]model.Item{
+		{ID: "1", Title: "dup", Kind: model.KindMail},
+		{ID: "2", Title: "B", Kind: model.KindMail},
+	})
+	if added != 1 || len(tbl.Items()) != 2 {
+		t.Fatalf("added=%d len=%d", added, len(tbl.Items()))
+	}
+}
+
+func TestDataTableNearEnd(t *testing.T) {
+	tbl := newDataTable()
+	tbl.SetSize(40, 10)
+	items := make([]model.Item, 10)
+	for i := range items {
+		items[i] = model.Item{ID: string(rune('0' + i)), Title: "x", Kind: model.KindMail}
+	}
+	tbl.SetData(model.ListSpec{Subject: model.SubjectMailInbox}, items)
+	tbl.cursorRow = 7
+	if !tbl.NearEnd(3) {
+		t.Fatal("expected near end")
+	}
+	tbl.cursorRow = 0
+	if tbl.NearEnd(3) {
+		t.Fatal("expected not near end")
+	}
+}