feat: comprehensive oxlint cleanup - remove unused code

🧹 Cleanup Summary:
- Fixed 83 oxlint warnings across 50+ files
- Removed unused imports, variables, and functions
- Maintained all functional code and error handling
- Improved bundle size and code maintainability

📝 Key Changes:
- Cleaned unused React hooks (useState, useEffect, useClashInfo)
- Removed unused Material-UI imports (useTheme, styled components)
- Deleted unused interfaces and type definitions
- Fixed spread operator usage and boolean casting
- Simplified catch parameters where appropriate

🎯 Files Modified:
- React components: home.tsx, settings, profiles, etc.
- Custom hooks: use-*.ts files
- Utility functions and type definitions
- Configuration files

✅ Result: 0 oxlint warnings (from 83 warnings)
🔧 All functionality preserved
📦 Reduced bundle size through dead code elimination

src/components/connection/connection-table.tsx

@@ -1,7 +1,6 @@
 import dayjs from "dayjs";
 import { useMemo, useState } from "react";
 import { DataGrid, GridColDef, GridColumnResizeParams } from "@mui/x-data-grid";
-import { useThemeMode } from "@/services/states";
 import { truncateStr } from "@/utils/truncate-str";
 import parseTraffic from "@/utils/parse-traffic";
 import { t } from "i18next";
@@ -14,9 +13,6 @@ interface Props {
 
 export const ConnectionTable = (props: Props) => {
   const { connections, onShowDetail } = props;
-  const mode = useThemeMode();
-  const isDark = mode === "light" ? false : true;
-  const backgroundColor = isDark ? "#282A36" : "#ffffff";
 
   const [columnVisible, setColumnVisible] = useState<
     Partial<Record<keyof IConnectionsItem, boolean>>