chore: add Biome for lint and fix all lint errors

- Install @biomejs/biome as devDependency at root
- Configure biome.json with 2-space indent, double quotes, Tailwind CSS support
- Add lint/lint:fix/format/format:fix scripts to root and app package.json
- Fix noNonNullAssertion: env vars extracted to variables with suppression, <div role=button> replaced with <button>
- Fix noUnusedVariables: remove unused destructured vars
- Fix useIterableCallbackReturn: arrow functions with block body
- Fix noExplicitAny: recharts Tooltip formatters
- Fix noLabelWithoutControl: add htmlFor+id or use <span> for non-input labels
- Fix noStaticElementInteractions/useKeyWithClickEvents: role+keyboard events for overlays
- Fix noArrayIndexKey: use error string as key
- Fix CSS parse: enable tailwindDirectives parser
- Normalize formatting across 80 files with biome check --write

apps/frontend/src/components/ui/loading-bar.tsx

@@ -1,10 +1,12 @@
-import { useState, useEffect, useRef } from "react";
-import { useRouterState } from "@tanstack/react-router";
 import { useIsFetching, useIsMutating } from "@tanstack/react-query";
+import { useRouterState } from "@tanstack/react-router";
+import { useEffect, useRef, useState } from "react";
 import { cn } from "@/lib/utils";
 
 export function LoadingBar() {
-  const isNavigating = useRouterState({ select: (s) => s.status === "pending" });
+  const isNavigating = useRouterState({
+    select: (s) => s.status === "pending",
+  });
   const isFetching = useIsFetching();
   const isMutating = useIsMutating();