fix: delete buffers after the window has closed (#263)

* fix: Delete confirmation window buffers after closing.

THe confirmation buffers are unlisted, but never deleted.

* fix: Delete auth popup window buffers after closing.

* Explicitly delete multiline_input buffers after closing.

These buffers configured with "bufhidden" "wipe", which should clean
them up after the buffer is hidden anyway. This is just an extra check
to be sure they are cleaned up.

Author: slg95

lua/mcphub/utils/ui.lua

@@ -110,15 +110,27 @@ function M.multiline_input(title, content, on_save, opts)
             end
         end
         -- Close the window
-        vim.api.nvim_win_close(win, true)
+        if vim.api.nvim_win_is_valid(win) then
+            vim.api.nvim_win_close(win, true)
+        end
+
+        if vim.api.nvim_buf_is_valid(bufnr) then
+            vim.api.nvim_buf_delete(bufnr, { force = true })
+        end
         -- -- Call save callback if content changed
         -- if content ~= new_content then
         on_save(new_content)
         -- end
     end
 
     local function close_window()
-        vim.api.nvim_win_close(win, true)
+        if vim.api.nvim_win_is_valid(win) then
+            vim.api.nvim_win_close(win, true)
+        end
+
+        if vim.api.nvim_buf_is_valid(bufnr) then
+            vim.api.nvim_buf_delete(bufnr, { force = true })
+        end
         if opts.on_cancel then
             opts.on_cancel()
         end
@@ -388,9 +400,11 @@ function M.confirm(message, opts)
 
             vim.schedule(function()
                 if vim.api.nvim_win_is_valid(win) then
-                    if vim.api.nvim_win_is_valid(win) then
-                        vim.api.nvim_win_close(win, true)
-                    end
+                    vim.api.nvim_win_close(win, true)
+                end
+
+                if vim.api.nvim_buf_is_valid(bufnr) then
+                    vim.api.nvim_buf_delete(bufnr, { force = true })
                 end
                 callback(confirmed, cancelled)
             end)
@@ -605,6 +619,13 @@ function M.open_auth_popup(server_name, auth_url)
         if vim.api.nvim_win_is_valid(input_win) then
             vim.api.nvim_win_close(input_win, true)
         end
+
+        if vim.api.nvim_buf_is_valid(info_buf) then
+            vim.api.nvim_buf_delete(info_buf, { force = true })
+        end
+        if vim.api.nvim_buf_is_valid(input_buf) then
+            vim.api.nvim_buf_delete(input_buf, { force = true })
+        end
         -- Return focus to MCPHub window
         if State.ui_instance and State.ui_instance.window then
             vim.api.nvim_set_current_win(State.ui_instance.window)