fix(client): VimwikiColorize accepts a range (no more E481 on selection)

Selecting text and running :VimwikiColorize {color} raised
"E481: No range allowed" — Vim prepends '<,'> to the command when invoked
from a visual selection, but the command was defined without -range.

All four colorize command defs (Vim + Neovim, Vimwiki* + Nuwiki*) are now
-range and forward the range count to the handler. A ranged (visual)
invocation wraps the '< / '> selection; a bare invocation wraps the cword.
The x-mode <Leader>wc mapping passes the visual flag explicitly.

The Vim-branch colorize() gained selection support (it was cword-only),
matching the Neovim branch, so both clients wrap a visual selection
identically. visual_selection_range() (Lua) no longer gates on
vim.fn.visualmode() — the explicit visual flag now carries that intent, and
the marks check guards unset selections.

Tests: cmd.Colorize_range_wraps_selection (nvim) and
colorize.{command_wraps_cword,visual_wraps_selection,ranged_command_no_error}
(vim). nvim 268, vim 257+18, all green.

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

development/vimwiki-gap.md

@@ -129,11 +129,17 @@ fix site.
   bug: `colorize()` inferred visual-vs-normal from `vim.fn.visualmode()`, which
   returns the *last* session visual mode with stale `'<`/`'>` marks — so the
   normal-mode command wrapped a leftover selection instead of the cword.
-  `colorize(color, visual)` now takes an explicit `visual` flag passed only by
-  the `x`-mode `<Leader>wc` mapping (`lua/nuwiki/keymaps.lua`); the command and
-  normal mapping always wrap the cword. Covered by `cmd.VimwikiColorize_uses_arg`,
-  `cmd.Colorize_ignores_stale_visual_selection`, and
-  `colorize.visual_wraps_selection` in `development/tests/test-keymaps.lua`.
+  `colorize(color, visual)` now takes an explicit `visual` flag; the command and
+  normal mapping always wrap the cword. Third bug: the commands were not
+  `-range`, so selecting text and running `:VimwikiColorize` (which Vim turns
+  into `:'<,'>VimwikiColorize`) raised `E481: No range allowed`. All four
+  command defs are now `-range` and pass the range to the handler — a ranged
+  (visual) invocation wraps the `'<`/`'>` selection on both clients; the
+  `x`-mode `<Leader>wc` mapping passes the visual flag directly. Covered by
+  `cmd.VimwikiColorize_uses_arg`, `cmd.Colorize_ignores_stale_visual_selection`,
+  `colorize.visual_wraps_selection`, `cmd.Colorize_range_wraps_selection` in
+  `test-keymaps.lua` and `colorize.{command_wraps_cword,visual_wraps_selection,
+  ranged_command_no_error}` in `test-keymaps-vim.vim`.
 - [ ] **`VimwikiTableMoveColumn{Left,Right}` dispatch to different backing names
   per client** — Vim branch → `table_move_left/right`; Neovim branch →
   `table_move_column_left/right`. Harmless today (each name exists in its own