feat(view): ensure it's above other floating windows

[LoneExile]

Ensure the which-key window appears above other floating windows,
such as the LSP diagnostics or terminal that floats.
This improves visibility when using the which-key plugin.

[ttytm]

Zindex should be a user configurable setting if it is added imho.

[LoneExile]

Zindex should be a user configurable setting if it is added imho.

Sure thing! I agree that making the z-index user configurable would be a better approach.
How about adding the z-index option within the 'window' table like this?

window = {
    border = "none",
    position = "bottom",
    margin = { 1, 0, 1, 0 },
    padding = { 1, 2, 1, 2 },
    winblend = 0,
    zindex = 1000 -- new user configurable option
},

[folke]

Great idea!

[LoneExile]

I've made the requested changes and updated the README.md and default config to include the user-configurable z-index setting.
Please take a look and let me know if any further adjustments are needed. Thanks!

[folke]

merged. thanks!