Enabling `ui2` breaks transparency consistency in `MsgArea`

### Description A very minor inconsistency – enabling the new ui2 with: ``` require('vim._core.ui2').enable() ``` Changes how the message/command line looks like – it makes the line darker and disables transparency. I believe that this effect is not desired. How it look with the old messages UI: <img width="777" height="555" alt="Image" src="https://github.com/user-attachments/assets/192bec4a-77d3-43f5-a5e0-8cdaf347d691" /> And with the new UI: <img width="777" height="555" alt="Image" src="https://github.com/user-attachments/assets/57a6538b-20a1-4fcf-93a2-332ee9534f84" /> My catppuccin setup: ```lua require("catppuccin").setup({ transparent_background = true, dim_inactive = { enabled = true }, }) vim.cmd.colorscheme("catppuccin") ``` ### Neovim version ```markdown NVIM v0.12.2 Build type: Release LuaJIT 2.1.1774896198 Run "nvim -V1 -v" for more info ``` ### Terminal and multiplexer Ghostty 1.3.1 ### Catppuccin version / branch / rev main ### Steps to reproduce 1. Set up config with: ```lua vim.pack.add({ "https://github.com/catppuccin/nvim", }) require("catppuccin").setup({ transparent_background = true, dim_inactive = { enabled = true }, }) vim.cmd.colorscheme("catppuccin") ``` 2. Everything looks "normal" 3. Add `require('vim._core.ui2').enable()` to your config 4. Save and reload 5. The command/mgs line will be darker ### Expected behavior Enabling ui2 should not make the msg area darker and non-transparent ### Actual behavior The msg area becomes darker and non-transparent when ui2 is enabled ### Repro ```Lua require('vim._core.ui2').enable() vim.pack.add({ "https://github.com/catppuccin/nvim", }) require("catppuccin").setup({ transparent_background = true, dim_inactive = { enabled = true }, }) vim.cmd.colorscheme("catppuccin") ```