fix(init): add nowait to buffer keymap opts

Problem: Buffer-local mappings like `!` could be swallowed by Neovim's
operator-pending machinery or by global maps sharing a prefix, since
the keymap opts did not include `nowait`.

Solution: Add `nowait = true` to the shared `opts` table used for all
buffer-local mappings in `_setup_buf_mappings`.

lua/pending/init.lua

@@ -232,7 +232,7 @@ end
 function M._setup_buf_mappings(bufnr)
   local cfg = require('pending.config').get()
   local km = cfg.keymaps
-  local opts = { buffer = bufnr, silent = true }
+  local opts = { buffer = bufnr, silent = true, nowait = true }
 
   ---@type table<string, fun()>
   local actions = {