Improve file structure

lua/config/options.lua

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+-- Line numbers
+vim.opt.number = true
+vim.opt.relativenumber = true
+
+-- Tabs & indentation
+vim.opt.tabstop = 4        -- number of spaces a tab counts for
+vim.opt.shiftwidth = 4     -- spaces for each indent
+vim.opt.expandtab = true   -- convert tabs to spaces
+vim.opt.smartindent = true
+
+-- Searching
+vim.opt.ignorecase = true  -- case-insensitive search...
+vim.opt.smartcase = true   -- ...unless you use capitals
+vim.opt.hlsearch = true
+vim.opt.incsearch = true
+
+-- UI / UX
+vim.opt.termguicolors = true
+vim.opt.cursorline = true
+vim.opt.signcolumn = "yes" -- avoid text shifting
+vim.opt.wrap = false       -- no line wrapping
+
+-- Behavior
+vim.opt.scrolloff = 8      -- keep lines above/below cursor
+vim.opt.sidescrolloff = 8
+vim.opt.updatetime = 300   -- faster diagnostics
+vim.opt.timeoutlen = 500   -- faster key sequences
+
+-- Clipboard (use system clipboard)
+vim.opt.clipboard = "unnamedplus"