[FEATURE]: Full window & tabbed support

[aikhe]

Description

Add the ability to open Cake in a dedicated full window or a separate tab

Problem Statement

While floating windows and splits are efficient for brief interactions, they often feel cramped when dealing with verbose build logs or long-running processes.

Specifically, when working on complex tasks, I often need a "dedicated workspace" feel. Currently, I have to manually manage window layouts or use :only to achieve a full-screen experience, which disrupts the editor's original state and requires manual restoration afterward.

Desired Solution

I'd like to see a configuration option or specific commands that allow Cake to occupy the entire window frame or initialize in a completely new tab page.

Proposed Configuration:

require('cake').setup({
  mode = "full",
})

vim.api.nvim_create_user_command(
  "CakeFull",
  function(opts)
    local mode = (opts.args == "tabbed") and "tab" or "full"
    require("cake").open_full(mode)
  end,
  { nargs = "?" }
)

Expected changes:

Features:

• Layout: Full-screen container that occupies the entire editor surface or a dedicated tab page.
• Context Restoration: Automatically remembers and restores the previous window layout or tab when Cake is closed.
• Tab Integration: Native Neovim tab support, allowing for seamless switching between the code workspace and the Cake environment using standard tab navigation.
• Environment Isolation: Ensures the terminal and header UI are appropriately scaled to fill the expanded dimensions without breaking the layout.

API Usage:

• require('cake').open_full(mode): opens the plugin UI in 'full' or 'tab' mode.
• require('cake').toggle(): respects the full or tab mode if defined in the setup.