fix: UDT type parsing and member access hover

- Fix UDT TYPE parsing: don't clear pending_type_name on VERSION/TITLE lines
- Fix UDT field type extraction: handle attribute blocks before colon
- Add comment capture for UDT type definitions
- Add better error messages when member resolution fails
- Handle quoted type names in field declarations

src/plc_json.lua

@@ -84,6 +84,7 @@ local function parse_scl_type_file(content)
   local in_struct = false
   local current_type_name = nil
   local pending_type_name = nil
+  local pending_type_comment = nil
 
   local in_fb = false
   local fb_name = nil
@@ -132,7 +133,7 @@ local function parse_scl_type_file(content)
         current_fb_section = "output"
       elseif trimmed:match("^VAR_IN_OUT") then
         current_fb_section = "inout"
-      elseif trimmed:match("^VAR%s") or trimmed:match("^VAR%s*$") then
+      elseif trimmed:match("^VAR%s") or trimmed:match("^VAR%s$") then
         current_fb_section = nil
       elseif trimmed:match("^VAR_TEMP") then
         current_fb_section = nil
@@ -169,33 +170,42 @@ local function parse_scl_type_file(content)
         in_struct = false
         current_type_name = nil
         pending_type_name = nil
+        pending_type_comment = nil
         local type_name = trimmed:match('TYPE%s+"([^"]+)"') or trimmed:match("^TYPE%s+(%w+)")
         if type_name then
           pending_type_name = type_name
         end
-        in_struct = false
-        current_type_name = nil
-        pending_type_name = nil
       elseif trimmed:match("^END_TYPE") then
         in_type = false
         in_struct = false
         current_type_name = nil
         pending_type_name = nil
+        pending_type_comment = nil
       elseif in_type then
-        if trimmed:match("^END_STRUCT") or trimmed:match("^END_STRUCT;") then
+        -- Capture comments before STRUCT
+        if trimmed:match("^//") then
+          local comment = trimmed:match("^//%s*(.+)$")
+          if comment and pending_type_name then
+            pending_type_comment = comment
+          end
+        elseif trimmed:match("^END_STRUCT") or trimmed:match("^END_STRUCT;") then
           in_struct = false
           current_type_name = nil
           pending_type_name = nil
+          pending_type_comment = nil
         elseif trimmed:match("^STRUCT") then
           if pending_type_name then
             current_type_name = pending_type_name
             in_struct = true
-            types[pending_type_name] = { name = pending_type_name, kind = "struct", fields = {}, source = "data_types_folder" }
+            types[pending_type_name] = { name = pending_type_name, kind = "struct", fields = {}, source = "data_types_folder", comment = pending_type_comment }
             pending_type_name = nil
+            pending_type_comment = nil
           end
         elseif not in_struct and trimmed:match("^%w+%s*:") and not trimmed:match("^STRUCT") then
+          -- This is an alias type declaration (TypeName : BaseType;)
+          -- NOT VERSION, TITLE, etc.
           local type_name = trimmed:match("^(%w+)%s*:")
-          if type_name then
+          if type_name and type_name ~= "VERSION" and type_name ~= "TITLE" then
             local next_line = lines[i + 1]
             local next_trimmed = next_line and next_line:gsub("^%s+", ""):gsub("%s+$", "")
             if next_trimmed and next_trimmed:match("^STRUCT") then
@@ -209,9 +219,16 @@ local function parse_scl_type_file(content)
             end
           end
         elseif in_struct and current_type_name and types[current_type_name] then
-          local field_name = line:match("^%s*(%w+)%s*:")
+          local field_name = line:match("^%s*(%w+)%s*{") or line:match("^%s*(%w+)%s*:")
           if field_name and field_name ~= "END_STRUCT" then
-            local field_type = line:match(":%s*([%w_]+)")
+            -- Remove attribute blocks before extracting type
+            local clean_line = line:gsub("%b{}", "")
+            -- Extract field type - handle both quoted and unquoted types
+            local field_type = clean_line:match(':%s*"([^"]+)"') or clean_line:match(":%s*([%w_]+)")
+            -- Also handle array types
+            if not field_type then
+              field_type = clean_line:match(":%s*(ARRAY.+)")
+            end
             local field_comment = line:match("//%s*(.+)$") or line:match("%(%*(.-)%*%)")
             table.insert(types[current_type_name].fields, {
               name = field_name,