Pass along more errors from infoview components.

We fall back to plain goals when interactive requests fail, but let's
pass along the error at least if it occurs (and prefer it if errors
occur with both).

lua/lean/infoview/components.lua

@@ -572,13 +572,13 @@ end
 ---@return Element[]? goal
 ---@return LspError? error
 function components.goal_at(params, sess, use_widgets)
-  local goal, err
+  local goal, interactive_err, err
   if use_widgets ~= false then
     if sess == nil then
       sess = rpc.open(params)
     end
 
-    goal = sess:getInteractiveGoals(params)
+    goal, interactive_err = sess:getInteractiveGoals(params)
     goal = goal and components.interactive_goals(goal, sess)
   end
 
@@ -588,7 +588,7 @@ function components.goal_at(params, sess, use_widgets)
     goal = goal and components.plain_goal(goal)
   end
 
-  return goal, err
+  return goal, interactive_err or err
 end
 
 ---@param params lsp.TextDocumentPositionParams
@@ -597,13 +597,13 @@ end
 ---@return Element[]?
 ---@return LspError?
 function components.term_goal_at(params, sess, use_widgets)
-  local term_goal, err
+  local term_goal, interactive_err, err
   if use_widgets ~= false then
     if sess == nil then
       sess = rpc.open(params)
     end
 
-    term_goal = sess:getInteractiveTermGoal(params)
+    term_goal, interactive_err = sess:getInteractiveTermGoal(params)
     term_goal = term_goal and components.interactive_term_goal(term_goal, sess)
   end
 
@@ -613,7 +613,7 @@ function components.term_goal_at(params, sess, use_widgets)
     term_goal = term_goal and components.term_goal(term_goal)
   end
 
-  return term_goal, err
+  return term_goal, interactive_err or err
 end
 
 ---@param params lsp.TextDocumentPositionParams