style: Migrate to stable-only rustfmt configuration

- Remove nightly-only features from .rustfmt.toml and vendor/ss58-registry/rustfmt.toml
- Removed features: imports_granularity, wrap_comments, comment_width,
  reorder_impl_items, spaces_around_ranges, binop_separator,
  match_arm_blocks, trailing_semicolon, trailing_comma
- Format all 898 affected files with stable rustfmt
- Ensures long-term reliability without nightly toolchain dependency

bizinikiwi/client/allocator/src/freeing_bump.rs

@@ -421,8 +421,8 @@ impl FreeingBumpHeapAllocator {
 
 		let header_ptr: u32 = match self.free_lists[order] {
 			Link::Ptr(header_ptr) => {
-				if (u64::from(header_ptr) + u64::from(order.size()) + u64::from(HEADER_SIZE)) >
-					mem.size()
+				if (u64::from(header_ptr) + u64::from(order.size()) + u64::from(HEADER_SIZE))
+					> mem.size()
 				{
 					return Err(error("Invalid header pointer detected"));
 				}