fix(return): improve return behavior when exiting .norg buffers

lua/neorg/modules/core/neorgcmd/commands/return/module.lua

@@ -30,20 +30,42 @@ module.on_event = function(event)
     if event.type == "core.neorgcmd.events.return" then
         -- Get all the buffers
         local buffers = vim.api.nvim_list_bufs()
+        local last_non_norg = nil
 
         local to_delete = {}
         for buffer in vim.iter(buffers):rev() do
-            if vim.fn.buflisted(buffer) == 1 then
+            if vim.fn.buflisted(buffer) == 1 and vim.api.nvim_buf_is_valid(buffer) then
                 -- If the listed buffer we're working with has a .norg extension then remove it (not forcibly)
-                if not vim.endswith(vim.api.nvim_buf_get_name(buffer), ".norg") then
-                    vim.api.nvim_win_set_buf(0, buffer)
-                    break
-                else
+                if vim.endswith(vim.api.nvim_buf_get_name(buffer), ".norg") then
                     table.insert(to_delete, buffer)
+                elseif not last_non_norg then
+                    last_non_norg = buffer
                 end
             end
         end
 
+        -- Determine a safe fallback buffer (alternate or last non-norg)
+        local target = nil
+        local alt = vim.fn.bufnr("#")
+
+        if
+            alt ~= -1
+            and vim.api.nvim_buf_is_valid(alt)
+            and vim.fn.buflisted(alt) == 1
+            and not vim.endswith(vim.api.nvim_buf_get_name(alt), ".norg")
+        then
+            target = alt
+        else
+            target = last_non_norg
+        end
+
+        if target then
+            vim.api.nvim_set_current_buf(target)
+        else
+            local new_buf = vim.api.nvim_create_buf(true, false)
+            vim.api.nvim_set_current_buf(new_buf)
+        end
+
         for _, buffer in ipairs(to_delete) do
             vim.api.nvim_buf_delete(buffer, {})
         end