Hover preview incorrectly narrows union of literal and type

Nadie ha tomado este issue todavía.

### How are you using the lua-language-server?

Visual Studio Code Extension (sumneko.lua)

### Which OS are you using?

Linux

### What is the issue affecting?

Hover

### Expected Behaviour

```lua
---@alias inttype -1 | 0 | integer
---@type inttype
local intvar = 1
---@alias stringtype "a" | "b" | string
---@type stringtype
local stringvar = "x"
```

I expect the hover previews for `inttype`, `intvar`, `stringtype`, and `stringvar` to show the full expansion of the `intttype` and `stringtype` aliases, something like

```
inttype:
| -1
| 0
| integer
```
and
```
stringtype:
| "a"
| "b"
| string
```

### Actual Behaviour

The rendered preview of the type aliases omits the overall type:
```
inttype:
| -1
| 0
```
and
```
stringtype:
| "a"
| "b"
```

This is especially weird because if those were the actual type definitions then the two assignments in the example would be type errors, which they are not.

### Reproduction steps

Put the code above into a Lua file in vscode with the language server extension running. Hover over the type aliases and the variables. The problem happens with just one literal in each union, two aren't required but I thought they illustrated the preview problem better.

### Additional Notes

The reason I want to make "useless" union types like this is for hinting to humans that those specific values are special in some way.

### Log File

_No response_

Reproduce el problema en un archivo Lua abierto en la extensión de Visual Studio Code pasando el cursor sobre los alias y las variables que se muestran en el informe. Sigue la ruta de renderizado de tipos del hover para las uniones que combinan valores literales con integer o string, y verifica que las vistas previas conserven el tipo general junto con los miembros literales.

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