feat: restore previm markdown preview (lazy-loaded, ,mp)

QUICKSTART.md

@@ -87,6 +87,7 @@ Ctrl+h/j/k/l   splits + tmux panes
 ## Markdown
 
 ```
+,mp             preview in browser
 ,mt             table of contents
 ```
 

modules/languages.vim

@@ -17,6 +17,16 @@ if exists('g:plugs["vim-markdown"]')
     nnoremap <leader>mt :Toc<CR>
 endif
 
+if has('macunix')
+    let g:previm_open_cmd = '/usr/bin/open'
+elseif executable('xdg-open')
+    let g:previm_open_cmd = 'xdg-open'
+endif
+let g:previm_enable_realtime = 1
+if exists('g:plugs["previm"]')
+    nnoremap <leader>mp :PrevimOpen<CR>
+endif
+
 " ── vim-go (syntax only — vim-lsp handles intelligence) ─────────────────────
 
 let g:go_gopls_enabled            = 0

modules/plugins.vim

@@ -42,6 +42,7 @@ Plug 'prabirshrestha/asyncomplete-lsp.vim'
 Plug 'pangloss/vim-javascript', { 'for': ['javascript', 'javascript.jsx'] }
 Plug 'HerringtonDarkholme/yats.vim', { 'for': ['typescript', 'typescript.tsx'] }
 Plug 'preservim/vim-markdown', { 'for': 'markdown' }
+Plug 'previm/previm', { 'on': 'PrevimOpen' }
 Plug 'fatih/vim-go', { 'for': 'go' }
 
 " ── UI ───────────────────────────────────────────────────────────────────────

modules/tools.vim

@@ -155,6 +155,8 @@ function! s:CheatSheet() abort
         \ '  ,f        format',
         \ '  ,o        outline',
         \ '  ,cr       run file',
+        \ '  ,mp       markdown preview',
+        \ '  ,mt       table of contents',
         \ '  [g ]g     LSP diagnostics',
         \ '  [e ]e     ALE errors',
         \ '',