refactor(completion): drive pum via vim.fn.complete() directly

lua/lsp/completion/init.lua

@@ -17,8 +17,6 @@ local function on_attach(client, buf)
         return
     end
 
-    vim.bo[buf].omnifunc = "v:lua.ow_lsp_completion.omnifunc"
-
     vim.api.nvim_clear_autocmds({ group = GROUP, buffer = buf })
     vim.api.nvim_create_autocmd("InsertCharPre", {
         buffer = buf,
@@ -208,12 +206,7 @@ function M.setup()
         return "<CR>"
     end, { expr = true, replace_keycodes = true })
 
-    vim.keymap.set(
-        "i",
-        "<C-x><C-o>",
-        session.trigger_manual,
-        { expr = true, remap = false }
-    )
+    vim.keymap.set("i", "<C-x><C-o>", session.trigger)
 end
 
 return M