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/image-diff.tsx

@@ -2,10 +2,8 @@
 
 import { getImageProps } from "next/image";
 import { Children } from "react";
-import {
-  ReactCompareSlider,
-  ReactCompareSliderImage,
-} from "react-compare-slider";
+import { ReactCompareSlider, ReactCompareSliderImage } from "react-compare-slider";
+
 import { cn } from "@/lib/utils";
 
 const ImageDiff = ({
@@ -18,16 +16,12 @@ const ImageDiff = ({
   // Extract the two image children
   const childrenArray = Children.toArray(children);
   if (childrenArray.length !== 2) {
-    console.error(
-      "ImageDiff must have exactly two children (before and after images)",
-    );
+    console.error("ImageDiff must have exactly two children (before and after images)");
     return null;
   }
 
   // Get the original image source to extract dimensions for aspect ratio
-  const firstChildProps = children[0].props as Parameters<
-    typeof getImageProps
-  >[0];
+  const firstChildProps = children[0].props as Parameters<typeof getImageProps>[0];
   const imageSrc = firstChildProps.src;
   const aspectRatio =
     typeof imageSrc === "object" && "width" in imageSrc && "height" in imageSrc
@@ -42,23 +36,10 @@ const ImageDiff = ({
 
   return (
     <ReactCompareSlider
-      className={cn(
-        "my-8 w-full max-w-full overflow-hidden rounded-sm",
-        className,
-      )}
+      className={cn("my-8 w-full max-w-full overflow-hidden rounded-sm", className)}
       style={{ aspectRatio }}
-      itemOne={
-        <ReactCompareSliderImage
-          {...beforeImageProps}
-          className="size-full object-cover"
-        />
-      }
-      itemTwo={
-        <ReactCompareSliderImage
-          {...afterImageProps}
-          className="size-full object-cover"
-        />
-      }
+      itemOne={<ReactCompareSliderImage {...beforeImageProps} className="size-full object-cover" />}
+      itemTwo={<ReactCompareSliderImage {...afterImageProps} className="size-full object-cover" />}
     />
   );
 };