fix: improve attribute block collapse for .udt and .db files

- Add case-insensitive pattern matching for attributes
- Add patterns for NonRetain and Retain attributes
- Add generic patterns for key := value and single word attributes
- Fix BufUnload autocmd to also handle *.udt and *.db files

lua/scl/attr_toggle.lua

@@ -109,11 +109,22 @@ function M.expand_all_attr_blocks()
   vim.notify("Expanded " .. count .. " attribute block(s)", vim.log.levels.INFO)
 end
 
+-- Helper to make a pattern case-insensitive
+local function case_insensitive_pattern(pattern)
+  return pattern:gsub("(%a)", function(c)
+    return "[" .. c:upper() .. c:lower() .. "]"
+  end)
+end
+
 -- Collapse all attribute blocks matching patterns in current buffer
 function M.collapse_all_attr_blocks(patterns)
   patterns = patterns or {
-    "^%s*EXTERNAL",  -- Match EXTERNALACCESSIBLE, EXTERNALVISIBLE, etc. (with optional leading space)
-    "^%s*S7_",      -- Match S7_Optimized_Access, etc. (with optional leading space)
+    case_insensitive_pattern("^%s*EXTERNAL"),     -- EXTERNALACCESSIBLE, EXTERNALVISIBLE
+    case_insensitive_pattern("^%s*S7_"),          -- S7_Optimized_Access
+    case_insensitive_pattern("^%s*NonRetain"),    -- NonRetain
+    case_insensitive_pattern("^%s*Retain"),       -- Retain (but not NonRetain)
+    "^%s*%w+%s*:=",                                -- key := value
+    "^%s*%w+%s*$",                                 -- single word attribute
   }
   
   local bufnr = vim.api.nvim_get_current_buf()
@@ -184,7 +195,7 @@ function M.setup()
   
   vim.api.nvim_create_autocmd("BufUnload", {
     group = augroup,
-    pattern = "*.scl",
+    pattern = { "*.scl", "*.udt", "*.db" },
     callback = function(args)
       M.clear_buffer_state(args.buf)
     end,