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/activity-calendar.tsx

@@ -4,11 +4,8 @@ import {
   type Activity,
   ActivityCalendar as ActivityCalendarPrimitive,
 } from "react-activity-calendar";
-import {
-  Tooltip,
-  TooltipContent,
-  TooltipTrigger,
-} from "@/components/ui/tooltip";
+
+import { Tooltip, TooltipContent, TooltipTrigger } from "@/components/ui/tooltip";
 import { cn } from "@/lib/utils";
 
 const ActivityCalendar = ({
@@ -50,9 +47,9 @@ const ActivityCalendar = ({
         maxLevel={4}
         renderBlock={(block, activity) => (
           <Tooltip>
-            <TooltipTrigger asChild>{block}</TooltipTrigger>
+            <TooltipTrigger render={block} />
             <TooltipContent>
-              <span className="font-medium text-[0.825rem]">{`${activity.count === 0 ? "No" : activity.count} ${noun}${activity.count === 1 ? "" : "s"} on ${new Date(activity.date).toLocaleDateString("en-US", { month: "short", day: "numeric" })}`}</span>
+              <span className="text-[0.825rem] font-medium">{`${activity.count === 0 ? "No" : activity.count} ${noun}${activity.count === 1 ? "" : "s"} on ${new Date(activity.date).toLocaleDateString("en-US", { month: "short", day: "numeric" })}`}</span>
             </TooltipContent>
           </Tooltip>
         )}