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

vendor/ss58-registry/build.rs

@@ -35,7 +35,7 @@ fn is_valid_rust_identifier(id: &str) -> Result<(), String> {
 		if ch.is_xid_start() {
 			for ch in id.chars().skip(1) {
 				if !ch.is_xid_continue() {
-					return Err(format!("Invalid char `{ch}` in `{id}`"))
+					return Err(format!("Invalid char `{ch}` in `{id}`"));
 				}
 			}
 			Ok(())
@@ -65,16 +65,16 @@ impl Registry {
                 ));
 			}
 			if account_type.network.is_empty() {
-				return Err("network is mandatory.".into())
+				return Err("network is mandatory.".into());
 			}
 
 			if let Err(err) = is_valid_rust_identifier(&account_type.name()) {
-				return Err(format!("network not valid: {err} for {account_type:#?}"))
+				return Err(format!("network not valid: {err} for {account_type:#?}"));
 			}
 			if account_type.decimals.len() != account_type.symbols.len() {
 				return Err(format!(
 					"decimals must be specified for each symbol: {account_type:?}"
-				))
+				));
 			}
 			for (name, decimals) in account_type.symbols.iter().zip(&account_type.decimals) {
 				use Entry::*;
@@ -87,7 +87,7 @@ impl Registry {
 								name,
 								e.get().networks.join(", "),
 								network,
-							))
+							));
 						}
 						e.get_mut().networks.push(network);
 					},

vendor/ss58-registry/rustfmt.toml

@@ -1,23 +1,19 @@
+# SS58 Registry - Stable Rustfmt Configuration
+# Only stable features for compatibility
+
 # Basic
 hard_tabs = true
 max_width = 100
 use_small_heuristics = "Max"
+
 # Imports
-imports_granularity = "Crate"
 reorder_imports = true
+
 # Consistency
 newline_style = "Unix"
-# Format comments
-comment_width = 100
-wrap_comments = true
+
 # Misc
 chain_width = 80
-spaces_around_ranges = false
-binop_separator = "Back"
-reorder_impl_items = false
 match_arm_leading_pipes = "Preserve"
-match_arm_blocks = false
 match_block_trailing_comma = true
-trailing_comma = "Vertical"
-trailing_semicolon = false
 use_field_init_shorthand = true