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/backend/src/modules/quotes/handlers/quoteEvents.ts

@@ -8,7 +8,9 @@ export function quoteEvents(c: Context) {
   function cleanup() {
     if (isCancelled) return;
     isCancelled = true;
-    cleanups.forEach((fn) => fn());
+    cleanups.forEach((fn) => {
+      fn();
+    });
   }
 
   const stream = new ReadableStream({
@@ -43,7 +45,7 @@ export function quoteEvents(c: Context) {
     headers: {
       "Content-Type": "text/event-stream",
       "Cache-Control": "no-cache",
-      "Connection": "keep-alive",
+      Connection: "keep-alive",
     },
   });
 }