refactor: improve initialization error messages (#276)

* refactor: improve initialization error messages 

See for example:

- #273 (comment).
> [ERROR][2025-12-20 12:11:21] ...lsp/handlers.lua:562	'[Project file:///path/to/project] Failed to initialize: {:shutdown, {:failed_to_start_child, {XPExpert.Project.Node, "project"}, {:error, :normal, ~c"could not compile dependency :elixir_sense, \\"mix compile\\" failed. Errors may have been logged above. You can recompile this dependency with \\"mix deps.compile elixir_sense --force\\", update it with \\"mix deps.update elixir_sense\\" or clean it with \\"mix deps.clean elixir_sense\\"\\n"}}}'
- #266
> [Project file:///d%3A/proj/hello] Failed to initialize: {:shutdown, {:failed_to_start_child, {XPExpert.Project.Node, "hello"}, {:error, :normal, ~c"done\r\n"}}}

* small cleanup

* line too long

Author: badosu

apps/expert/lib/expert.ex

@@ -303,7 +303,7 @@ defmodule Expert do
     }
   end
 
-  defp initialization_error_message({:shutdown, {:failed_to_start_child, child, {reason, _}}}) do
+  defp initialization_error_message({:shutdown, {:failed_to_start_child, child, reason}}) do
     case child do
       {Project.Node, node_name} ->
         node_initialization_message(node_name, reason)
@@ -319,12 +319,15 @@ defmodule Expert do
 
   defp node_initialization_message(name, reason) do
     case reason do
-      # NOTE:
-      # ** (Mix.Error) httpc request failed with: ... Could not install Hex because Mix could not download metadata ...
-      {:shutdown, {:error, :normal, message}} ->
-        "Engine #{name} shutdown with error:\n\n#{message}"
+      # NOTE: ~c"could not compile dependency :elixir_sense..."
+      {:error, :normal, message} ->
+        "Engine #{name} initialization failed with error:\n\n#{message}"
 
-      {:shutdown, {:node_exit, node_exit}} ->
+      # NOTE: ** (Mix.Error) httpc request failed with: ...Could not install Hex because Mix could not download...
+      {{:shutdown, {:error, :normal, message}}, _} ->
+        "Engine #{name} shut down with error:\n\n#{message}"
+
+      {{:shutdown, {:node_exit, node_exit}}, _} ->
         "Engine #{name} exit with status #{node_exit.status}, last message:\n\n#{node_exit.last_message}"
 
       reason ->