perf: several dragged items cross to another place as one tar stream; older agents get them one by one

internal/server/ai_test.go

@@ -147,3 +147,14 @@ func TestAIChatNeedsUserOn(t *testing.T) {
 		t.Fatalf("on: %d %q", w.Code, b)
 	}
 }
+
+func TestVersionAtLeast(t *testing.T) {
+	for _, c := range []struct {
+		v    string
+		want bool
+	}{{"0.2.0", true}, {"0.10.1", true}, {"0.1.9", false}, {"", false}, {"dev", false}, {"1.0", true}} {
+		if got := versionAtLeast(c.v, "0.2.0"); got != c.want {
+			t.Errorf("%q: %v", c.v, got)
+		}
+	}
+}