Initial neovim config

Lazy.nvim plugin manager, LSP (rust-analyzer, clangd, ts_ls, zls),
treesitter, telescope, bufferline, neo-tree, gitsigns, lazygit,
alabaster theme, persistence sessions, nvim-cmp, lualine, which-key.

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

lua/plugins/lsp.lua

@@ -0,0 +1,57 @@
+return {
+  {
+    "williamboman/mason.nvim",
+    opts = {},
+  },
+  {
+    "williamboman/mason-lspconfig.nvim",
+    dependencies = { "williamboman/mason.nvim", "neovim/nvim-lspconfig" },
+    opts = {
+      ensure_installed = {
+        "ts_ls",
+        "clangd",
+      },
+    },
+  },
+  {
+    "neovim/nvim-lspconfig",
+    dependencies = {
+      "williamboman/mason-lspconfig.nvim",
+      "hrsh7th/cmp-nvim-lsp",
+    },
+    config = function()
+      local capabilities = require("cmp_nvim_lsp").default_capabilities()
+
+      -- LSP keymaps on attach
+      vim.api.nvim_create_autocmd("LspAttach", {
+        callback = function(ev)
+          local map = function(keys, func, desc)
+            vim.keymap.set("n", keys, func, { buffer = ev.buf, desc = desc })
+          end
+          map("gd", vim.lsp.buf.definition, "Go to definition")
+          map("gD", vim.lsp.buf.declaration, "Go to declaration")
+          map("gr", vim.lsp.buf.references, "Go to references")
+          map("gi", vim.lsp.buf.implementation, "Go to implementation")
+          map("K", vim.lsp.buf.hover, "Hover documentation")
+          map("<leader>ca", vim.lsp.buf.code_action, "Code action")
+          map("<leader>rn", vim.lsp.buf.rename, "Rename symbol")
+          map("<leader>fs", "<cmd>Telescope lsp_document_symbols<cr>", "Document symbols")
+        end,
+      })
+
+      -- Configure servers using vim.lsp.config (Neovim 0.11+)
+      vim.lsp.config("ts_ls", { capabilities = capabilities })
+      vim.lsp.config("clangd", { capabilities = capabilities })
+      vim.lsp.config("zls", { capabilities = capabilities })
+
+      -- Enable servers
+      vim.lsp.enable({ "ts_ls", "clangd", "zls" })
+    end,
+  },
+  {
+    -- Rust gets its own dedicated plugin
+    "mrcjkb/rustaceanvim",
+    version = "^5",
+    lazy = false,
+  },
+}