Update nvim config

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

lua/mappings.lua

@@ -1,10 +1,68 @@
 require "nvchad.mappings"
 
--- add yours here
-
 local map = vim.keymap.set
 
 map("n", ";", ":", { desc = "CMD enter command mode" })
-map("i", "jk", "<ESC>")
+map("i", "jj", "<ESC>")
+map("i", "оо", "<ESC>")
 
--- map({ "n", "i", "v" }, "<C-s>", "<cmd> w <cr>")
+-- Перемещение строк вверх/вниз в Visual режиме
+map("v", "<A-j>", ":m '>+1<CR>gv=gv", { desc = "Move line down" })
+map("v", "<A-k>", ":m '<-2<CR>gv=gv", { desc = "Move line up" })
+
+-- Курсор остаётся на месте при объединении строк
+map("n", "J", "mzJ`z", { desc = "Join lines keeping cursor" })
+
+-- Центрировать экран при скролле и поиске
+map("n", "<C-d>", "<C-d>zz", { desc = "Scroll down centered" })
+map("n", "<C-u>", "<C-u>zz", { desc = "Scroll up centered" })
+map("n", "n", "nzzzv", { desc = "Next search centered" })
+map("n", "N", "Nzzzv", { desc = "Prev search centered" })
+
+-- Вставка поверх выделения без потери буфера
+map("x", "<leader>p", '"_dP', { desc = "Paste without yanking" })
+
+-- Быстрое сохранение
+map({ "n", "i", "v" }, "<C-s>", "<cmd>w<CR>", { desc = "Save file" })
+
+-- Markdown превью: scroll sync
+local mdviewer_sync = vim.api.nvim_create_augroup("MDViewerScrollSync", { clear = true })
+local mdviewer_preview_win = nil
+
+local function setup_scroll_sync()
+  vim.api.nvim_clear_autocmds { group = mdviewer_sync }
+  vim.api.nvim_create_autocmd("CursorMoved", {
+    group = mdviewer_sync,
+    callback = function()
+      local win = mdviewer_preview_win
+      if not win or not vim.api.nvim_win_is_valid(win) then return end
+
+      local src_line = vim.api.nvim_win_get_cursor(0)[1]
+      local src_total = vim.api.nvim_buf_line_count(0)
+      if src_total <= 1 then return end
+
+      local ratio = (src_line - 1) / (src_total - 1)
+
+      pcall(vim.api.nvim_win_call, win, function()
+        local term_total = vim.fn.line "$"
+        if term_total <= 1 then return end
+        local target = math.max(1, math.floor(ratio * (term_total - 1)) + 1)
+        vim.cmd("normal! " .. target .. "Gzt")
+      end)
+    end,
+  })
+end
+
+map("n", "<leader>mp", function()
+  vim.cmd "MDViewerToggle"
+  local preview = require "mdviewer.preview"
+  if preview.is_active() then
+    -- После toggle курсор в окне превью — запоминаем его
+    mdviewer_preview_win = vim.api.nvim_get_current_win()
+    vim.cmd "wincmd p"
+    setup_scroll_sync()
+  else
+    mdviewer_preview_win = nil
+    vim.api.nvim_clear_autocmds { group = mdviewer_sync }
+  end
+end, { desc = "Toggle markdown preview" })