test: verify text wraps correctly within border/padding content area

Yoga's measure function already receives the content-area width (minus
parent border/padding), so text wrapping is correct without additional
adjustment in the paint pass.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/runtime-tests/integration/layout/text-wrap-width.test.tsx

@@ -0,0 +1,66 @@
+import { defineComponent } from "vue";
+import { expect, test } from "vite-plus/test";
+import { render } from "@vue-tui/testing";
+import { Box, Text } from "@vue-tui/runtime";
+
+test("text wraps within border content area, not outer width", async () => {
+  // Box is 12 wide with single border (1 char each side).
+  // Content area is 12 - 2 = 10 chars.
+  // "Hello World!" is 12 chars, should wrap at 10.
+  const { lastFrame } = await render(
+    defineComponent(() => () => (
+      <Box borderStyle="single" width={12}>
+        <Text>Hello World!</Text>
+      </Box>
+    )),
+    { columns: 100 },
+  );
+  const frame = lastFrame()!;
+  // Text should wrap to fit the 10-char content area
+  expect(frame).toContain("Hello");
+  expect(frame).toContain("World!");
+  // The text "Hello World!" wraps: "Hello " on line 1, "World!" on line 2
+  const lines = frame.split("\n");
+  // Should have 4 lines: top border, text line 1, text line 2, bottom border
+  expect(lines).toHaveLength(4);
+  // Verify text doesn't overflow outside the border
+  for (const line of lines) {
+    expect(line.length).toBeLessThanOrEqual(12);
+  }
+});
+
+test("text wraps within padding content area", async () => {
+  // Box is 12 wide with padding 1 each side.
+  // Content area is 12 - 2 = 10 chars.
+  const { lastFrame } = await render(
+    defineComponent(() => () => (
+      <Box width={12} paddingX={1}>
+        <Text>Hello World!</Text>
+      </Box>
+    )),
+    { columns: 100 },
+  );
+  const frame = lastFrame()!;
+  // Text wraps to 10-char content area
+  expect(frame).toContain("Hello");
+  expect(frame).toContain("World!");
+  // Two lines of text
+  const lines = frame.split("\n");
+  expect(lines).toHaveLength(2);
+});
+
+test("text wraps within border+padding content area", async () => {
+  // Box is 14 wide with single border (1 each side) + padding 1 each side.
+  // Content area is 14 - 2 (border) - 2 (padding) = 10 chars.
+  const { lastFrame } = await render(
+    defineComponent(() => () => (
+      <Box borderStyle="single" width={14} paddingX={1}>
+        <Text>Hello World!</Text>
+      </Box>
+    )),
+    { columns: 100 },
+  );
+  const frame = lastFrame()!;
+  expect(frame).toContain("Hello");
+  expect(frame).toContain("World!");
+});