feat(git): open commits from gitlog in the same window

lua/git/init.lua

@@ -28,9 +28,9 @@ end
 ---@class ow.Git.NewScratchOpts
 ---@field name string?
 ---@field bufhidden ("hide"|"wipe")?  defaults to "hide"
----@field split ("above"|"below"|"left"|"right")?  defaults to splitbelow-aware horizontal
+---@field split (false|"above"|"below"|"left"|"right")? defaults to splitbelow-aware horizontal. `false` places the buffer in the current window (drops a `'` mark first so the user can jump back).
 
----Open a split with a fresh non-modifiable scratch buffer. Default split
+---Create a fresh non-modifiable scratch buffer and place it. Default split
 ---direction is horizontal, honouring `splitbelow`. Caller flips
 ---`modifiable`, fills the buffer, and sets `filetype` once content lands.
 ---@param opts ow.Git.NewScratchOpts?
@@ -47,6 +47,11 @@ function M.new_scratch(opts)
     if opts.name then
         pcall(vim.api.nvim_buf_set_name, buf, opts.name)
     end
+    if opts.split == false then
+        vim.cmd.normal({ "m'", bang = true })
+        vim.api.nvim_set_current_buf(buf)
+        return buf, vim.api.nvim_get_current_win()
+    end
     local split = opts.split or (vim.o.splitbelow and "below" or "above")
     local win = vim.api.nvim_open_win(buf, true, { split = split })
     return buf, win