feat: Add throw_statement to Java significant blocks

Added `throw_statement` node to the list of significant blocks for Java
in the Typewriter.nvim configuration. This ensures that throw statements
are centered and highlighted during code navigation for improved
readability and code management.

lua/typewriter/utils/center_block_config.lua

@@ -273,6 +273,9 @@ M.expand = {
 	["variant_declaration"] = true,
 	["constructor_name"] = true,
 	["let_expression"] = true,
+
+	-- Java-specific significant blocks
+	["throw_statement"] = true,
 }
 
 --- Get the expansion status for a given node type