fix(commands)+docs: even out :NuwikiUISelect; exhaustive subgroup key lists

- ftplugin/vimwiki.vim: add buffer-local :NuwikiUISelect to the Vim path
  (it previously existed only on the Neovim path, contradicting the docs'
  "buffer-local on every .wiki buffer" claim — a global fallback masked it).
  Now symmetric with :VimwikiUISelect.

- Make every keymap subgroup description list all of its bindings instead
  of trailing with "…": the README mappings-subgroups table, the README
  config-example comments, the README g:nuwiki_no_<group>_mappings rows,
  the doc/nuwiki.txt group→keys list, and the lua/nuwiki/config.lua comment.
  Also fixes the doc list that had dropped aH/iH from text_objects and adds
  the mouse group. Each notes that the <Leader>w prefix follows map_prefix.

helptags validates (no dup tags); all keymap suites pass (266+18+21 Vim,
275 Lua); :NuwikiUISelect confirmed defined on a Vim .wiki buffer.

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

doc/nuwiki.txt

@@ -267,15 +267,32 @@ Vim-specific globals ~
     Per-subgroup opt-outs, each defaulting to 0. Setting one to 1 drops just
     that group's buffer-local keymaps while leaving the rest in place; the
     whole-layer |g:nuwiki_no_default_mappings| still wins over all of them.
-    These mirror the Lua-side `mappings.<group>` booleans. Valid groups:
-        `wiki_prefix`     `<Leader>w*`
-        `links`           `<CR>`, `<S-CR>`, `<Tab>`, `<BS>`, `+`, …
-        `lists`           `<C-Space>`, `gl*`, `o`/`O`, insert-mode list edits
+    These mirror the Lua-side `mappings.<group>` booleans. Every binding in
+    each group (the `<Leader>w` prefix follows |g:nuwiki_map_prefix|):
+        `wiki_prefix`     `<Leader>ww`, `<Leader>wt`, `<Leader>ws`,
+                          `<Leader>wi`, `<Leader>w<Leader>w`,
+                          `<Leader>w<Leader>y`, `<Leader>w<Leader>t`,
+                          `<Leader>w<Leader>m`, `<Leader>w<Leader>i`
+        `links`           `<CR>`, `<S-CR>`, `<C-CR>`, `<C-S-CR>`, `<D-CR>`,
+                          `<M-CR>`, `<BS>`, `<Tab>`, `<S-Tab>`, `+` (n/x),
+                          `<Leader>wn`, `<Leader>wd`, `<Leader>wr`,
+                          `<Leader>wc` (n/x)
+        `lists`           `<C-Space>` (also `<C-@>`/`<Nul>`), `gnt`, `gln`,
+                          `glp`, `glx`, `glh`, `gll`, `gLh`, `gLl`, `glr`,
+                          `gLr`, `gl-`, `gl*`, `gl#`, `gl1`, `gli`, `glI`,
+                          `gla`, `glA`, `gL-`, `gL*`, `gL#`, `gL1`, `gLi`,
+                          `gLI`, `gLa`, `gLA`, `gl`, `gL`, `o`, `O`; insert
+                          `<C-D>`, `<C-T>`, `<C-L><C-J>`, `<C-L><C-K>`,
+                          `<C-L><C-M>`, `<CR>`
         `headers`         `=`, `-`, `]]`, `[[`, `]=`, `[=`, `]u`, `[u`
-        `table_editing`   `gqq`, `<A-Left>`, `<A-Right>`, insert `<Tab>`
+        `table_editing`   `gqq`, `gq1`, `gww`, `gw1`, `<A-Left>`,
+                          `<A-Right>`; insert `<Tab>`, `<S-Tab>`
         `diary`           `<C-Down>`, `<C-Up>`
         `html_export`     `<Leader>wh`, `<Leader>whh`, `<Leader>wha`
-        `text_objects`    `ah`, `ih`, `al`, `il`, `a\`, `i\`, `ac`, `ic`
+        `text_objects`    `ah`, `ih`, `aH`, `iH`, `al`, `il`, `a\`, `i\`,
+                          `ac`, `ic`
+        `mouse`           `<2-LeftMouse>`, `<S-2-LeftMouse>`,
+                          `<C-2-LeftMouse>`, `<MiddleMouse>`, `<RightMouse>`
 
                                                         *g:nuwiki_map_prefix*
 `g:nuwiki_map_prefix`          `'<Leader>w'`