[NVIM] Add markdown table and checklist support

render-markdown (tables/checkboxes only), vim-table-mode, prettier via
conform, cell jumps and checkbox toggle.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

nvim/init.vim

@@ -92,6 +92,12 @@ Plug 'pangloss/vim-javascript'
 " Tex
 Plug 'lervag/vimtex'
 
+" Markdown
+Plug 'nvim-tree/nvim-web-devicons'
+Plug 'MeanderingProgrammer/render-markdown.nvim'
+Plug 'dhruvasagar/vim-table-mode'
+Plug 'stevearc/conform.nvim'
+
 "Go
 Plug 'fatih/vim-go'
 
@@ -498,5 +504,45 @@ try
 catch
     " Ignore non existing file
 endtry
+" Markdown
+if !exists('g:vscode')
+" Table mode under <Leader>T (<Leader>t is TextWrapToggle)
+let g:table_mode_corner = '|' " GFM-valid delimiter row
+let g:table_mode_map_prefix = '<Leader>T'
+let g:table_mode_tableize_d_map = '<Leader>Td'
+
+lua << EOF
+-- Only tables and checkboxes; everything else stays plain markdown
+local off = { enabled = false }
+require('render-markdown').setup({
+    -- gutter signs open the signcolumn after wrapped tables are sized -> overflow
+    sign = off,
+    heading = off, code = off, dash = off, bullet = off, quote = off, link = off,
+    html = off, latex = off, yaml = off, inline_highlight = off,
+    checkbox = { unchecked = { icon = '󰄱 ' }, checked = { icon = '󰱒 ' } },
+})
+vim.keymap.set('n', '<Leader>mr', '<cmd>RenderMarkdown toggle<CR>', { desc = 'Toggle render markdown' })
+
+-- Prettier aligns tables on save; :FormatToggle disables it per buffer
+require('conform').setup({
+    formatters_by_ft = { markdown = { 'prettier' } },
+    formatters = {
+        prettier = { prepend_args = { '--prose-wrap', 'preserve', '--print-width', '120' } },
+    },
+    -- async: Node startup can be slow, don't block :w
+    format_after_save = function(bufnr)
+        if vim.g.disable_autoformat or vim.b[bufnr].disable_autoformat then return end
+        return {}
+    end,
+})
+vim.api.nvim_create_user_command('FormatToggle', function()
+    vim.b.disable_autoformat = not vim.b.disable_autoformat
+    print('Format on save ' .. (vim.b.disable_autoformat and 'off' or 'on'))
+end, {})
+vim.keymap.set('n', '<Leader>F', function() require('conform').format({ async = true }) end,
+    { desc = 'Format document' })
+EOF
+endif
+
 let g:tex_flavor = "latex"
 autocmd FileType yaml setlocal ts=2 sts=2 sw=2 expandtab