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

pezkuwi/node/overseer/src/lib.rs

@@ -698,7 +698,7 @@ where
 	#[cfg(any(target_os = "linux", feature = "jemalloc-allocator"))]
 	let collect_memory_stats: Box<dyn Fn(&OverseerMetrics) + Send> =
 		match memory_stats::MemoryAllocationTracker::new() {
-			Ok(memory_stats) =>
+			Ok(memory_stats) => {
 				Box::new(move |metrics: &OverseerMetrics| match memory_stats.snapshot() {
 					Ok(memory_stats_snapshot) => {
 						gum::trace!(
@@ -711,7 +711,8 @@ where
 					Err(e) => {
 						gum::debug!(target: LOG_TARGET, "Failed to obtain memory stats: {:?}", e)
 					},
-				}),
+				})
+			},
 			Err(_) => {
 				gum::debug!(
 					target: LOG_TARGET,