feat(root): disable expensive plugins during paste to avoid lag

Prevents performance degradation when using paste with configured plugins.

init.lua

@@ -5,4 +5,46 @@ require('options')
 require('autocmd')
 require('lsp')
 
+-- Disable expensive features during paste to avoid lag
+do
+    local function disable(buf)
+        vim.b[buf]._paste_state = { lsp = vim.diagnostic.is_enabled(), mini = vim.b[buf].miniindentscope_disable }
+        if vim.b[buf]._paste_state.lsp then vim.diagnostic.enable(false) end
+        vim.b[buf].miniindentscope_disable = true
+        vim.b[buf].ts_highlight_disable = true
+        vim.b[buf].ts_indent_disable = true
+    end
+
+    local function enable(buf)
+        local s = vim.b[buf]._paste_state
+        if s then
+            if s.lsp then vim.diagnostic.enable() end
+            vim.b[buf].miniindentscope_disable = s.mini
+        end
+        vim.b[buf]._paste_state = nil
+        vim.b[buf].ts_highlight_disable = nil
+        vim.b[buf].ts_indent_disable = nil
+    end
+
+    local orig_paste = vim.paste
+    vim.paste = function(lines, phase)
+        if phase == 'start' then disable(vim.api.nvim_get_current_buf())
+        elseif phase == 'finish' then vim.schedule(function() enable(vim.api.nvim_get_current_buf()) end) end
+        return orig_paste(lines, phase)
+    end
+
+    local function perf_paste(cmd)
+        return function()
+            local buf = vim.api.nvim_get_current_buf()
+            disable(buf)
+            local reg = vim.v.register
+            vim.cmd('normal! "' .. reg .. cmd)
+            vim.schedule(function() enable(buf) end)
+        end
+    end
+
+    vim.keymap.set('n', 'p', perf_paste('p=`]'), { desc = 'Paste and auto-indent' })
+    vim.keymap.set('n', 'P', perf_paste('P=`]'), { desc = 'Paste before and auto-indent' })
+end
+