Running bubbletea apps inside vim gives bad output

Being experimenting with running bubbletea programs inside vim/neovim using `:!app`, here's what I've found:

# Problem 1: stdin and opening a tty

If you don't pass a `WithInput` option, bubbletea will fallback to `/dev/stdin`, which is OK, but then it'll try to open a new tty, which fails inside vim.

Passing `WithInput(nil)` fixes the issue.

## Problem 1.2: `WithInput(os.Stdin)`

If instead of a `nil` input, you pass `os.Stdin` directly, you get a even weirder error:

```
:!go run .
^[[?25lcould not run program: error creating cancelreader: add reader to epoll interest list
exit status 1

shell returned 1
```

# Problem 2: ansi escape codes in output

Ok, let's keep the `WithInput(nil)`, if you then run the program from within vim, you'll get ansi escape code sequences all over the place:

```
:!go run .
^[[?25l
/ Spinning...

h/l, ←/→: change spinner • q: exit
^[[0D^[[1A^[[1A^[[1A^[[2K^[[1A^[[0D^[[2K
- Spinning...
^[[1B^[[1B^[[0D^[[1A^[[1A^[[1A^[[2K^[[1A^[[0D^[[2K
\ Spinning...
^[[1B^[[1B^[[0D^[[1A^[[1A^[[1A^[[2K^[[1A^[[0D^[[2K
| Spinning...
^[[1B^[[1B^[[0D^[[1A^[[1A^[[1A^[[2K^[[1A^[[0D^[[2K
/ Spinning...
^[[1B^[[1B^[[0D^[[1A^[[1A^[[1A^[[2K^[[1A^[[0D^[[2K
```

To be honest, that seems to happen with other things too, e.g., fish shell:

```
:!echo (set_color --bold magenta) "Hello world"
^[[1m^[[35m Hello world

Press ENTER or type command to continue
```

---

# Footnotes

- Lipgloss examples seem to work properly
- Termenv examples also print the escape codes, so maybe the problem is there?
- I think the biggest real bugs here involve setting the input, not sure what the right behavior should be though