feat(client): bind bare gl/gL to remove-checkbox for vimwiki parity

Upstream vimwiki binds bare gl/gL to remove-checkbox (item / whole list);
nuwiki had rebound the conceptual keys to gl<Space>/gL<Space> as remove-done,
a same-keys-different-effect parity trap. Bind bare gl/gL to remove-checkbox
instead — they share the gl… prefix so they fire after 'timeoutlen', exactly
as upstream. Remove-done becomes command-only; add -bang to *RemoveDone so
:NuwikiRemoveDone! reaches the whole-buffer sweep that gL<Space> previously
held (its only entry point).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

lua/nuwiki/keymaps.lua

@@ -231,10 +231,14 @@ function M.attach(bufnr, mappings)
       map('n', 'gL' .. key, function() cmd.list_change_symbol(sym, true) end,
           { desc = 'nuwiki: set list markers to ' .. sym }, bufnr)
     end
-    map('n', 'gl<Space>', cmd.list_remove_done,
-        { desc = 'nuwiki: remove done items (current list)' }, bufnr)
-    map('n', 'gL<Space>', cmd.list_remove_done_all,
-        { desc = 'nuwiki: remove done items (whole doc)' }, bufnr)
+    -- Bare gl/gL: remove the checkbox marker, keep the item text (upstream
+    -- VimwikiRemoveSingleCB / RemoveCBInList). They share the `gl…` prefix
+    -- with the maps above, so they fire after `timeoutlen` — exactly as
+    -- upstream. Remove-done is command-only (`:NuwikiRemoveDone[!]`).
+    map('n', 'gl', cmd.list_remove_checkbox,
+        { desc = 'nuwiki: remove checkbox (current item)' }, bufnr)
+    map('n', 'gL', cmd.list_remove_checkbox_in_list,
+        { desc = 'nuwiki: remove checkboxes (whole list)' }, bufnr)
     map('n', 'o',         open_below_with_bullet, { desc = 'nuwiki: open below + bullet' }, bufnr)
     map('n', 'O',         open_above_with_bullet, { desc = 'nuwiki: open above + bullet' }, bufnr)