Use @stylistic/brace-style for eslint

Up to now `eslint-plugin-brace-rules` was used to enforce a common brace
style for JavaScript code. This plugin was however updated the last time
over 9 years ago and will be incompatible with ESLint v10, as that
[removes `context.getSourceCode()`][1], the plugin relies on.

To keep the eslint config working with ESLint v10, this replaces
`eslint-plugin-brace-rules` with the [`@stylistic/brace-style`][2] rule
from `@stylistic/eslint-plugin`, a package we already use.

While `@stylistic/brace-style` doesn't offer an option to format braces
in exactly the same way as before, the "allman" style seems to be the
one closest to the existing code.

[1]: https://eslint.org/blog/2025/11/eslint-v10.0.0-alpha.0-released/#removed-deprecated-rule-context-members
[2]: https://eslint.style/rules/brace-style

eslint.config.mjs

@@ -3,7 +3,6 @@
 // [1] https://nodejs.org/api/esm.html#esm_no_node_path
 import { createRequire } from 'node:module';
 const require = createRequire(import.meta.url);
-const braceRules = require("eslint-plugin-brace-rules");
 const stylistic = require("@stylistic/eslint-plugin");
 
 
@@ -123,6 +122,7 @@ const configStylistic = {
 	},
 
 	"rules": {
+		"@stylistic/brace-style": ["warn", "allman", { "allowSingleLine": true }],
 		"@stylistic/comma-spacing": "warn",
 		"@stylistic/indent": ["warn", "tab", { "outerIIFEBody": "off" }],
 		"@stylistic/key-spacing": "warn",
@@ -147,41 +147,9 @@ const configStylistic = {
 };
 
 
-const configBracesRules = {
-	"plugins": {
-		"brace-rules": braceRules
-	},
-
-	"rules": {
-		"brace-rules/brace-on-same-line": [
-			"warn",
-			{
-				"FunctionDeclaration": "never",
-				"FunctionExpression": "ignore",
-				"ArrowFunctionExpression": "always",
-				"IfStatement": "never",
-				"TryStatement": "ignore",
-				"CatchClause": "ignore",
-				"DoWhileStatement": "never",
-				"WhileStatement": "never",
-				"ForStatement": "never",
-				"ForInStatement": "never",
-				"ForOfStatement": "never",
-				"SwitchStatement": "never",
-			},
-			{
-				"allowSingleLine": true,
-			}
-		],
-	}
-};
-
-
 const configs = [configIgnores, configEslintRecommended];
 Object.assign(configs[1].rules, configEslintExtra.rules);
-configs[1].plugins = { ...configBracesRules.plugins };
-Object.assign(configs[1].rules, configBracesRules.rules);
-Object.assign(configs[1].plugins, configStylistic.plugins);
+configs[1].plugins = { ...configStylistic.plugins };
 Object.assign(configs[1].rules, configStylistic.rules);
 
 export default configs;