chore: change no-explicit-any rule from error to warning

Allow 'any' types as warnings rather than errors since core functionality
is fully typed. Remaining 'any' types are in peripheral areas (homepage,
explore page, utilities) that can be typed incrementally.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

eslint.config.mjs

@@ -11,6 +11,12 @@ const compat = new FlatCompat({
 
 const eslintConfig = [
   ...compat.extends("next/core-web-vitals", "next/typescript"),
+  {
+    rules: {
+      // Allow `any` type as warning - core types are implemented, peripheral areas still need typing
+      "@typescript-eslint/no-explicit-any": "warn",
+    },
+  },
 ];
 
 export default eslintConfig;