Upgrade ESLint from 8 to 9 with flat config migration

Replace .eslintrc.cjs with eslint.config.mjs, upgrade eslint-plugin-vue
to 10, eslint-plugin-cypress to 6, @vue/eslint-config-prettier to 10,
and remove @rushstack/eslint-patch.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/main.ts

@@ -68,7 +68,7 @@ app.config.globalProperties.$cytoscape = cytoscape;
 
 // Cytoscape.js's style
 cytoscape.use( dagre );
-cytoscape.use( popper((ref: any) => ref) );
+cytoscape.use( popper((ref) => ref) );
 
 app.use(pinia);
 app.use(router);