fix(app): keep dense template bar previews visible

apps/app/src/components/template-library/template-card-bar.test.tsx

@@ -0,0 +1,27 @@
+import { afterEach, expect, it, vi } from "vitest";
+import { cleanup, render } from "@testing-library/react";
+import { TemplateCard } from "./template-card";
+afterEach(cleanup);
+it.each([1, 6, 40, 300])("keeps %i bars visible within the SVG viewport", (count) => {
+  const data = Array.from({ length: count }, (_, i) => ({ label: String(i), value: i + 1 }));
+  const { container } = render(<TemplateCard id="chart" name="Revenue" description="" html=""
+    componentType="barChart" componentData={{ data }} dataDescription="" version={1} onApply={vi.fn()} />);
+  const svg = container.querySelector("svg")!;
+  const [, , viewportWidth, viewportHeight] = svg.getAttribute("viewBox")!.split(" ").map(Number);
+  const bars = Array.from(svg.querySelectorAll("rect"));
+  expect(bars).toHaveLength(count);
+  let previousRight = -1;
+  for (const bar of bars) {
+    const x = Number(bar.getAttribute("x"));
+    const y = Number(bar.getAttribute("y"));
+    const width = Number(bar.getAttribute("width"));
+    const height = Number(bar.getAttribute("height"));
+    expect(width).toBeGreaterThan(0);
+    expect(height).toBeGreaterThan(0);
+    expect(x).toBeGreaterThanOrEqual(previousRight);
+    expect(x + width).toBeLessThanOrEqual(viewportWidth);
+    expect(y).toBeGreaterThanOrEqual(0);
+    expect(y + height).toBeLessThanOrEqual(viewportHeight);
+    previousRight = x + width;
+  }
+});

apps/app/src/components/template-library/template-card.tsx

@@ -25,8 +25,10 @@ interface TemplateCardProps {
 function BarChartPreview({ data }: { data: { label: string; value: number }[] }) {
   if (!data?.length) return null;
   const max = Math.max(...data.map((d) => d.value));
-  const barWidth = Math.min(40, Math.floor(280 / data.length) - 8);
-  const chartWidth = data.length * (barWidth + 8);
+  const slotWidth = Math.min(48, 280 / data.length);
+  const gap = Math.min(8, slotWidth / 4);
+  const barWidth = slotWidth - gap;
+  const chartWidth = data.length * slotWidth;
   const chartHeight = 100;
 
   return (
@@ -42,7 +44,7 @@ function BarChartPreview({ data }: { data: { label: string; value: number }[] })
         return (
           <rect
             key={i}
-            x={i * (barWidth + 8)}
+            x={i * slotWidth}
             y={chartHeight - h - 10}
             width={barWidth}
             height={h}