fix(lint): specify explicit React version to fix ESLint 10 compatibility

eslint-plugin-react (bundled in eslint-config-next) calls context.getFilename()
during React version detection ('detect' mode). This API was removed in ESLint 10.
Specifying an explicit version string bypasses the detection code path.

Agent-Logs-Url: https://github.com/christianlouis/InboxConverge/sessions/b58e009c-5bb7-4a25-b0e2-89b2d08a5778

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

frontend/eslint.config.mjs

@@ -13,6 +13,15 @@ const eslintConfig = defineConfig([
     "build/**",
     "next-env.d.ts",
   ]),
+  // Specify explicit React version to avoid eslint-plugin-react calling the
+  // removed context.getFilename() API when using version: 'detect' with ESLint 10.
+  {
+    settings: {
+      react: {
+        version: "19",
+      },
+    },
+  },
 ]);
 
 export default eslintConfig;