nvim: fix startup errors, add language + project-run support

Startup errors:
- catppuccin: the bufferline integration moved to catppuccin.special.bufferline
- lspconfig-extended: drop the removed LazyVim keymaps API for
  opts.servers["*"].keys, and move remove-workspace-folder to <leader>clR
  so it stops colliding with LspRestart on <leader>clr
- options: lazyvim_cmp = "blink" is not a valid value, it is "blink.cmp"

Language support (python, c/cpp, rust, zephyr, and the common ones) via
lazyvim.json extras: dap.core, clangd, cmake, docker, git, json, rust,
toml, yaml.

- lang/zephyr.lua: gated entirely on ZEPHYR_BASE / ZEPHYR_SDK_INSTALL_DIR /
  GNUARMEMB_TOOLCHAIN_PATH, returning {} when none are set, so it is inert
  on machines without Zephyr. Nothing is hardcoded: the clangd
  --query-driver globs are built from those vars, falling back to resolving
  the cross-gcc through exepath()+fs_realpath(). Adds devicetree/kconfig
  treesitter and filetypes (*.overlay, Kconfig.*, prj.conf, *_defconfig).
- clangd/config.yaml: strip the GCC-only flags Zephyr emits into
  compile_commands.json (-fno-printf-return-value, -mfp16-format=*, ...),
  which clang rejects as "Unknown argument". Remove only drops flags that
  are present, so it is a no-op for native builds. Takes a built Zephyr app
  from 15 diagnostics to 0, with CONFIG_* resolving into the generated
  autoconf.h.
- npm-servers.lua: npm is not installed here, so yaml/docker servers failed
  to install on every startup and to spawn on every matching file. Sets
  both enabled = false and mason = false for servers whose binary is
  missing from PATH and from mason/bin.

Project runner under <leader>R (<leader>r is refactoring), dispatching on
the detected project type -- zephyr, rust, python, cmake, make:

  Rr run project   Rb build   Rt test   RF build+flash   Rf run file
  Rk configure     Rc clean   Rs select target/board     Ri info

Zephyr boards are picked with vim.ui.select over `west boards`, cached per
scan and persisted per project root under stdpath("state"), never written
into the project. A build with no board set prompts first, then proceeds.
Detection walks up from the last real file buffer, tracked by an autocmd,
because a terminal opened by one of these verbs would otherwise become the
buffer detection ran from.

Also <leader>b1..b9/b0 jump to buffer N (ordinal, no longer skipping the
current one) and <leader>b<Left>/<Right> cycle.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01StGBghPW9Dm7z7uj2VNWHr

nvim/lua/plugins/npm-servers.lua

@@ -0,0 +1,60 @@
+-- Some language servers are distributed only as npm packages, and Node on Arch
+-- ships without npm. Without this guard you get two separate rounds of errors:
+--
+--   1. mason-lspconfig retries the install on every startup and fails, once per
+--      server ("failed to install yamlls" ...).
+--   2. LazyVim still enables the server, so opening any matching file fails with
+--      "Spawning language server with cmd: { "yaml-language-server", ... } failed".
+--
+-- So each server below is disabled unless its binary can actually be found.
+-- Nothing is hardcoded to this host: the check is a PATH lookup plus Mason's own
+-- bin directory, so the moment the server exists it enables itself again.
+--
+-- To get them: sudo pacman -S npm
+--              nvim +"MasonInstall yaml-language-server dockerfile-language-server" +qa
+
+-- LazyVim server name -> the executable Mason/npm installs for it.
+local npm_servers = {
+  yamlls = "yaml-language-server",
+  dockerls = "docker-langserver",
+  docker_compose_language_service = "docker-compose-langserver",
+}
+
+local mason_bin = vim.fs.joinpath(vim.fn.stdpath("data"), "mason", "bin")
+
+---@param bin string
+---@return boolean
+local function available(bin)
+  if vim.fn.executable(bin) == 1 then
+    return true
+  end
+  -- Mason prepends its bin dir to PATH only after setup, so look there directly.
+  return vim.uv.fs_stat(vim.fs.joinpath(mason_bin, bin)) ~= nil
+end
+
+local missing = {}
+for server, bin in pairs(npm_servers) do
+  if not available(bin) then
+    missing[#missing + 1] = server
+  end
+end
+
+if #missing == 0 then
+  return {}
+end
+
+return {
+  {
+    "neovim/nvim-lspconfig",
+    opts = function(_, opts)
+      opts.servers = opts.servers or {}
+      for _, server in ipairs(missing) do
+        opts.servers[server] = vim.tbl_deep_extend("force", opts.servers[server] or {}, {
+          enabled = false, -- do not try to spawn a binary that is not there
+          mason = false, -- and do not retry the impossible install every startup
+        })
+      end
+      return opts
+    end,
+  },
+}