feat(keymap): Add nowait to buffer-local keymaps

Without nowait, single-key bindings like 'd' can feel sluggish if
the user has operator-pending mappings. Vim waits for potential
follow-up keys (dd, dw, etc.) before executing.

Author: MaxFangX

lua/vgit/core/keymap.lua

@@ -67,6 +67,7 @@ function keymap.buffer_set(buffer, opts, callback)
     desc = desc,
     silent = silent,
     noremap = noremap,
+    nowait = true,
     buffer = buffer.bufnr,
   })