Add work nvim language pack, switch tmux prefix to Ctrl-Space

Work language support (C#, TS, JS, CSS, HTML, Prettier) is now gated
behind a stow-loaded work-languages.lua module so it only activates
when the work package is stowed. Tmux prefix changed from Ctrl-b to
Ctrl-Space to match the neovim Space-leader feel.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

work/.config/nvim/lua/work-languages.lua

@@ -0,0 +1,21 @@
+-- Loaded by init.lua when this file exists (work stow package active).
+-- Mirrors work-dev-settings.el: C#, TypeScript, JavaScript, CSS, HTML + Prettier.
+return {
+  servers = {
+    ts_ls     = {},  -- handles TypeScript, TSX, JavaScript, JSX
+    cssls     = {},
+    html      = {},
+    csharp_ls = {},
+  },
+  parsers = { 'c_sharp', 'css', 'html', 'javascript', 'tsx', 'typescript' },
+  formatters = {
+    javascript      = { 'prettier' },
+    javascriptreact = { 'prettier' },
+    typescript      = { 'prettier' },
+    typescriptreact = { 'prettier' },
+    css             = { 'prettier' },
+    html            = { 'prettier' },
+    json            = { 'prettier' },
+  },
+  tools = { 'prettier' },
+}