fix: resolve PostCSS parsing error in FeedFilters.vue

- Add missing <style scoped> section to FeedFilters.vue to fix PostCSS error

The PostCSS error was occurring because Vue single-file components require
a <style> section, even if empty, for proper CSS processing.

src/components/FeedFilters.vue

@@ -210,3 +210,7 @@ export default class FeedFilters extends Vue {
   }
 }
 </script>
+
+<style scoped>
+/* Component-specific styles if needed */
+</style>