Add keyboard layout indicator (RU/EN) to lualine

Green background for EN, red for RU. Uses im-select on macOS.

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

nvim/lua/plugins/lualine.lua

@@ -1,3 +1,29 @@
+local function keyboard_layout()
+  local handle = io.popen("im-select")
+  if not handle then
+    return ""
+  end
+  local result = handle:read("*a")
+  handle:close()
+  if result:find("Russian") then
+    return "RU"
+  end
+  return "EN"
+end
+
+local function keyboard_layout_color()
+  local handle = io.popen("im-select")
+  if not handle then
+    return { bg = "#a6e3a1", fg = "#1e1e2e", gui = "bold" }
+  end
+  local result = handle:read("*a")
+  handle:close()
+  if result:find("Russian") then
+    return { bg = "#f38ba8", fg = "#1e1e2e", gui = "bold" }
+  end
+  return { bg = "#a6e3a1", fg = "#1e1e2e", gui = "bold" }
+end
+
 return {
   "nvim-lualine/lualine.nvim",
   dependencies = { "nvim-tree/nvim-web-devicons" },
@@ -9,7 +35,12 @@ return {
     },
     sections = {
       lualine_a = { "mode" },
-      lualine_b = { "branch", "diff", "diagnostics" },
+      lualine_b = {
+        { keyboard_layout, color = keyboard_layout_color },
+        "branch",
+        "diff",
+        "diagnostics",
+      },
       lualine_c = { { "filename", path = 1 } },
       lualine_x = { "encoding", "filetype" },
       lualine_y = { "progress" },