fix(lists): VimwikiToggleRejectedListItem -range parity (P3)

Upstream's :VimwikiToggleRejectedListItem is -range and binds glx in
visual mode; nuwiki's four defs were bare, so a ranged invocation raised
E481 and acted cursor-only. Same -range class already fixed for
ToggleListItem/Increment/Decrement -- ToggleRejected was missed.

All four defs (Vim+Neovim x Vimwiki*/Nuwiki*) are now -range, routed
through a new reject_list_item_range(l1, l2) looping over_range in both
clients, mirroring toggle_list_item_range. Visual glx stays cursor-only,
consistent with its <C-Space>/gln/glp siblings.

Also logs the 2026-06-02 re-audit findings in development/vimwiki-gap.md:
RemoveDone lost -range (low pri); config gaps list_margin
semantics/markdown-default, diary_months, markdown_header_style,
diary_caption_level=-1; and the path_html/template_path default-location
divergences. Mappings audit came back clean.

Tests: cmd.reject_list_item_range (test-keymaps.lua),
cmd.VimwikiToggleRejectedListItem_accepts_range (test-keymaps-vim.vim).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

development/tests/test-keymaps-vim.vim

@@ -669,6 +669,24 @@ call s:record(
       \ 'cmd.VimwikiListChangeLvl_accepts_range_and_args',
       \ 'err=' . s:lcl_err)
 
+" ===== :VimwikiToggleRejectedListItem -range =====
+" Was bare (range-less): `:1,3VimwikiToggleRejectedListItem` raised E481. The
+" reject is an LSP roundtrip (no server here), so assert only the attribute
+" parse: no E481.
+call s:set_buf(['- [ ] a', '- [ ] b', '- [ ] c'])
+let s:trl_err = ''
+try
+  silent 1,3VimwikiToggleRejectedListItem
+catch /E481/
+  let s:trl_err = v:exception
+catch
+  " non-E481 (e.g. no LSP attached) is expected and fine here.
+endtry
+call s:record(
+      \ s:trl_err ==# '' ? 1 : 0,
+      \ 'cmd.VimwikiToggleRejectedListItem_accepts_range',
+      \ 'err=' . s:trl_err)
+
 " ===== :VimwikiSplitLink -nargs=* =====
 " Upstream takes optional reuse/move-cursor flags; nuwiki's defs took none, so
 " `:VimwikiSplitLink 0 1` raised E488. Now -nargs=*: assert the arg parse