fix: resolve all eslint errors (set-state-in-effect, nested components, no-explicit-any)

- Wrap synchronous setState calls in useEffect with startTransition to avoid cascading renders
- Convert nested SortIcon components to renderSortIcon helper functions
- Replace all `any` types with proper interfaces (OverviewData, TrendPoint, RankItem)
- Remove unused formatTokens import in logs page
- Add no-any rule to CLAUDE.md

lib/i18n.tsx

@@ -1,6 +1,6 @@
 "use client";
 
-import { createContext, useContext, useState, useEffect, type ReactNode } from "react";
+import { createContext, useContext, useState, useEffect, startTransition, type ReactNode } from "react";
 
 export type Locale = "zh" | "en";
 
@@ -195,7 +195,9 @@ export function I18nProvider({ children }: { children: ReactNode }) {
 
   useEffect(() => {
     const saved = localStorage.getItem("locale") as Locale | null;
-    if (saved && (saved === "zh" || saved === "en")) setLocale(saved);
+    if (saved && (saved === "zh" || saved === "en")) {
+      startTransition(() => setLocale(saved));
+    }
   }, []);
 
   const handleSetLocale = (l: Locale) => {