fix: Attribute block expand/collapse, TIME literal diagnostics, and formatter bugs

- SCLFormat: Remove clear_buffer_state() call that was preventing
       expand after formatting (attr_toggle state now preserved)
     - Diagnostics: Fix false 'Undefined variable' for IEC literals
       like T#2s, D#1d, S5T#1s (TIME, DATE, S5TIME types)
     - Formatter: Fix block comments (* ... *) being misidentified as
       FB calls in VAR_IN_OUT/VAR_INPUT/VAR_OUTPUT sections
     - Formatter: Fix array-based FB calls like instTimers[idx].TON()
       not being properly formatted with aligned parameters

src/diagnostics.lua

@@ -95,11 +95,22 @@ function M.validate_diagnostics(content, workspace_types, root_dir)
       var_section_start = nil
     end
 
+    -- Check if a hash-prefixed match is part of an IEC literal (TIME, S5TIME, etc.)
+    local function is_iec_literal_at(line, match_start)
+      if not line or not match_start then return false end
+      if match_start <= 1 then return false end
+      local prefix = line:sub(match_start - 1, match_start - 1):upper()
+      return prefix == "T" or prefix == "D" or prefix == "S"
+    end
+
     if not in_var_section then
       local hash_vars = {}
       for var in line:gmatch("#[%w_]+") do
         local var_name = var:sub(2)
-        hash_vars[var_name] = true
+        local match_start = line:find(var, 1, true)
+        if not is_iec_literal_at(line, match_start) then
+          hash_vars[var_name] = true
+        end
       end
 
       for var_name, _ in pairs(hash_vars) do