style(frontend): apply ultracite 7.12 formatting and lint rules

frontend/src/lib/media/waveform.ts

@@ -13,10 +13,10 @@ export async function computeWaveform(
     const data = audio.getChannelData(0);
     const block = Math.max(1, Math.floor(data.length / bars));
     const peaks: number[] = [];
-    for (let i = 0; i < bars; i++) {
+    for (let i = 0; i < bars; i += 1) {
       const start = i * block;
       let max = 0;
-      for (let j = 0; j < block; j++) {
+      for (let j = 0; j < block; j += 1) {
         const value = Math.abs(data[start + j] ?? 0);
         if (value > max) {
           max = value;