style: prettier on v1.4.25 W3 files

`pnpm format:check` flagged two files touched in the previous W3 +
W3b commits — `src/components/insights/insights-tab-strip.tsx` (the
new tab strip) and `src/lib/charts/x-axis-density.ts` (the rebuilt
tick-density helper). Prettier normalised the Tailwind class-name
ordering and the multi-line function signature; no behaviour change.

src/components/insights/insights-tab-strip.tsx

@@ -149,7 +149,7 @@ export function InsightsTabStrip({
       )}
     >
       <div className="flex items-center gap-2">
-        <div className="flex min-w-0 flex-1 gap-2 overflow-x-auto [scrollbar-width:none] [&::-webkit-scrollbar]:hidden">
+        <div className="flex min-w-0 flex-1 [scrollbar-width:none] gap-2 overflow-x-auto [&::-webkit-scrollbar]:hidden">
           {SECTION_IDS.map((id) => {
             const isActive = activeId === id;
             return (

src/lib/charts/x-axis-density.ts

@@ -79,10 +79,7 @@ const DESKTOP_BUCKETS: ReadonlyArray<TickBucket> = [
   { minPoints: 181, interval: 29 }, // 180+ days   → monthly
 ];
 
-function resolveBucket(
-  pointCount: number,
-  viewportWidth: number,
-): TickBucket {
+function resolveBucket(pointCount: number, viewportWidth: number): TickBucket {
   const buckets =
     viewportWidth < MOBILE_DESKTOP_BREAKPOINT_PX
       ? MOBILE_BUCKETS
@@ -116,9 +113,8 @@ export function chooseTickInterval(
   viewportWidth: number,
 ): number {
   if (!Number.isFinite(pointCount) || pointCount <= 0) return 0;
-  const safeViewport = Number.isFinite(viewportWidth) && viewportWidth > 0
-    ? viewportWidth
-    : 1280;
+  const safeViewport =
+    Number.isFinite(viewportWidth) && viewportWidth > 0 ? viewportWidth : 1280;
   const bucket = resolveBucket(pointCount, safeViewport);
   return Math.max(0, bucket.interval);
 }