refactor: migrate from Biome to oxlint/oxfmt, remove contact form

- Replace Biome with oxlint + oxfmt (OXC toolchain) for linting and formatting
- Add .oxlintrc.json and .oxfmtrc.json configuration files
- Update VS Code settings and devcontainer to use oxc-vscode extension
- Remove contact form, Resend email integration, and related server action/schema
- Remove unused UI components (accordion, alert, card, tabs, toggle, etc.)

components/view-counter.tsx

@@ -1,8 +1,8 @@
 "use client";
 
 import { useEffect, useState } from "react";
-import { CountUp } from "@/components/count-up";
 
+import { CountUp } from "@/components/count-up";
 import { incrementViews } from "@/lib/server/views";
 
 const ViewCounter = ({ slug }: { slug: string }) => {
@@ -15,8 +15,8 @@ const ViewCounter = ({ slug }: { slug: string }) => {
       .then((hits) => {
         setViews(hits);
       })
-      .catch((error) => {
-        console.error("[view-counter] error:", error);
+      .catch((err) => {
+        console.error("[view-counter] error:", err);
         setError(true);
       });
   }, [slug]);