Describe the bug
With a writable stream and an invalid FAT, RootStorage.Dispose can loop for an uncomfortably long time.
This was found by a fuzzer (FatChainLoopInDispose.zip).

Note that attempting to open the attached file with OpenMcdf.Explorer will fail, since it tries to open all streams and detects the FAT corruption.

To Reproduce

    [TestMethod]
    [Timeout(3000, CooperativeCancellation = false)]
    [DataRow("FatChainLoopInDispose")]
    public void FatChainLoopInDispose(string fileName)
    {
        var bytes = File.ReadAllBytes(fileName);
        using var stream = new MemoryStream(bytes);
        using var rootStorage = RootStorage.Open(stream, StorageModeFlags.LeaveOpen);
        Assert.ThrowsExactly<FileNotFoundException>(() => rootStorage.OpenStream("Metadata"));
    }

This test will time out, but it will succeed with a read-only stream (e.g. new MemoryStream(bytes, false) or a FileStream with FileAccess.Read).

Expected behavior
Not to hang.

Actual behavior
Several minutes hang.

Environment (please complete the following information):

• Version 3.3.0
• OS: Windows 11 23H2
• TFM: net10.0