fix: align multiline assignment continuation lines

- Fix formatter to detect continuation lines that don't start with
  operators (e.g., #variable AND ... continuation lines)
- All continuation lines now align vertically after :=

src/formatter.lua

@@ -330,9 +330,19 @@ function M.format_document(content, options)
     trimmed = collapse_attribute_block(trimmed)
 
     -- Check if continuing assignment
-    if in_assignment and is_assignment_continuation(trimmed) then
-      table.insert(formatted_lines, assignment_continuation_indent .. trimmed)
-      goto continue
+    -- Continuation if: in assignment AND (starts with operator OR doesn't start new statement)
+    if in_assignment then
+      local starts_with_operator = is_assignment_continuation(trimmed)
+      local is_new_statement = trimmed:match("^%w+") and (
+        trimmed:match(":=") or 
+        BLOCKS[trimmed:match("^([%w_]+)")] or 
+        SAME_LEVEL[trimmed:match("^([%w_]+)")] or
+        VAR_KEYWORDS[trimmed:match("^([%w_]+)")]
+      )
+      if starts_with_operator or not is_new_statement then
+        table.insert(formatted_lines, assignment_continuation_indent .. trimmed)
+        goto continue
+      end
     end
     in_assignment = false