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/config/autocmds.lua

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+local augroup = vim.api.nvim_create_augroup
+local autocmd = vim.api.nvim_create_autocmd
+
+-- Highlight on yank
+autocmd("TextYankPost", {
+  group = augroup("highlight_yank", { clear = true }),
+  callback = function()
+    vim.highlight.on_yank({ timeout = 200 })
+  end,
+})
+
+-- Remove trailing whitespace on save
+autocmd("BufWritePre", {
+  group = augroup("trim_whitespace", { clear = true }),
+  pattern = "*",
+  command = "%s/\\s\\+$//e",
+})
+
+-- Restore cursor position
+autocmd("BufReadPost", {
+  group = augroup("restore_cursor", { clear = true }),
+  callback = function()
+    local mark = vim.api.nvim_buf_get_mark(0, '"')
+    local lcount = vim.api.nvim_buf_line_count(0)
+    if mark[1] > 0 and mark[1] <= lcount then
+      pcall(vim.api.nvim_win_set_cursor, 0, mark)
+    end
+  end,
+})
+
+-- Auto-resize splits on window resize
+autocmd("VimResized", {
+  group = augroup("auto_resize", { clear = true }),
+  command = "tabdo wincmd =",
+})

lua/config/keymaps.lua

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+vim.g.mapleader = " "
+vim.g.maplocalleader = " "
+
+local map = vim.keymap.set
+
+-- Better window navigation
+map("n", "<C-h>", "<C-w>h", { desc = "Go to left window" })
+map("n", "<C-j>", "<C-w>j", { desc = "Go to lower window" })
+map("n", "<C-k>", "<C-w>k", { desc = "Go to upper window" })
+map("n", "<C-l>", "<C-w>l", { desc = "Go to right window" })
+
+-- Resize windows
+map("n", "<C-Up>", ":resize +2<CR>", { desc = "Increase window height" })
+map("n", "<C-Down>", ":resize -2<CR>", { desc = "Decrease window height" })
+map("n", "<C-Left>", ":vertical resize -2<CR>", { desc = "Decrease window width" })
+map("n", "<C-Right>", ":vertical resize +2<CR>", { desc = "Increase window width" })
+
+-- Buffers
+map("n", "<S-l>", ":bnext<CR>", { desc = "Next buffer" })
+map("n", "<S-h>", ":bprevious<CR>", { desc = "Previous buffer" })
+map("n", "<leader>bd", ":bdelete<CR>", { desc = "Delete buffer" })
+
+-- Move lines up/down in visual mode
+map("v", "J", ":m '>+1<CR>gv=gv", { desc = "Move selection down" })
+map("v", "K", ":m '<-2<CR>gv=gv", { desc = "Move selection up" })
+
+-- Keep cursor centered when scrolling
+map("n", "<C-d>", "<C-d>zz")
+map("n", "<C-u>", "<C-u>zz")
+
+-- Keep cursor centered on search results
+map("n", "n", "nzzzv")
+map("n", "N", "Nzzzv")
+
+-- Clear search highlight
+map("n", "<Esc>", ":nohlsearch<CR>", { desc = "Clear search highlight" })
+
+-- Better paste (don't override register)
+map("x", "<leader>p", '"_dP', { desc = "Paste without overwriting register" })
+
+-- Save file
+map("n", "<C-s>", ":w<CR>", { desc = "Save file" })
+
+-- Diagnostic navigation
+map("n", "[d", vim.diagnostic.goto_prev, { desc = "Previous diagnostic" })
+map("n", "]d", vim.diagnostic.goto_next, { desc = "Next diagnostic" })
+map("n", "<leader>e", vim.diagnostic.open_float, { desc = "Show diagnostic" })

lua/config/options.lua

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+local opt = vim.opt
+
+-- Line numbers
+opt.number = true
+opt.relativenumber = true
+
+-- Tabs & indentation
+opt.tabstop = 4
+opt.shiftwidth = 4
+opt.expandtab = true
+opt.smartindent = true
+
+-- Search
+opt.ignorecase = true
+opt.smartcase = true
+opt.hlsearch = true
+opt.incsearch = true
+
+-- Appearance
+opt.termguicolors = true
+opt.signcolumn = "yes"
+opt.cursorline = true
+opt.scrolloff = 8
+opt.sidescrolloff = 8
+
+-- Line wrapping
+opt.wrap = false
+
+-- Clipboard
+opt.clipboard = "unnamedplus"
+
+-- Split behavior
+opt.splitright = true
+opt.splitbelow = true
+
+-- Undo / swap
+opt.undofile = true
+opt.swapfile = false
+opt.backup = false
+
+-- Performance
+opt.updatetime = 250
+opt.timeoutlen = 300
+
+-- Completion menu
+opt.completeopt = "menuone,noselect"
+
+-- File encoding
+opt.fileencoding = "utf-8"