Enhance formatting by preserving view on save, update keymaps

Save cursor position and folds before formatting, restoring them
afterwards to improve user experience during format-on-save.

lua/plugins/none-ls.lua

@@ -87,7 +87,11 @@ return {
             callback = function()
               -- Only format if format-on-save is enabled (global flag)
               if vim.g.format_on_save ~= false then
+                -- Save view (cursor position, folds, etc.) before formatting
+                local view = vim.fn.winsaveview()
                 vim.lsp.buf.format({ bufnr = bufnr })
+                -- Restore view after formatting to preserve folds
+                vim.fn.winrestview(view)
               end
             end,
           })