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/mixnet/src/maybe_inf_delay.rs

@@ -78,14 +78,15 @@ impl MaybeInfDelay {
 				},
 				Inner::Finite(delay) => delay.reset(duration),
 			},
-			None =>
+			None => {
 				self.0 = match std::mem::replace(
 					&mut self.0,
 					Inner::Infinite { waker: None, delay: None },
 				) {
 					Inner::Finite(delay) => Inner::Infinite { waker: None, delay: Some(delay) },
 					infinite => infinite,
-				},
+				}
+			},
 		}
 	}
 }

bizinikiwi/client/mixnet/src/request.rs

@@ -92,8 +92,9 @@ impl mixnet::request_manager::Request for Request {
 
 	fn with_data<T>(&self, f: impl FnOnce(Scattered<u8>) -> T, _context: &Self::Context) -> T {
 		match self {
-			Request::SubmitExtrinsic { extrinsic, .. } =>
-				f([&[SUBMIT_EXTRINSIC][..], extrinsic.0.as_slice()].as_slice().into()),
+			Request::SubmitExtrinsic { extrinsic, .. } => {
+				f([&[SUBMIT_EXTRINSIC][..], extrinsic.0.as_slice()].as_slice().into())
+			},
 		}
 	}