Replace lspsaga with my fork of lspsaga which contains more options for the winbar which makes it easier to integrate it with lualine, which I've also done here. Additionally, set cmdheight=0, and refactor some calls to add_keymaps.

nvim/lua/lualine_extension_lspsaga.lua

@@ -0,0 +1,9 @@
+local M = {}
+
+function M.get_breadcrumbs()
+    local breadcrumbs = require("lspsaga.symbol.winbar").get_bar()
+    -- Return breadcrumbs if the string exists and is not empty, otherwise, get the filename and return it
+    return breadcrumbs and breadcrumbs ~= "" and breadcrumbs or vim.fn.expand("%:t")
+end
+
+return M