test(tui): fix diff-viewer-file-tree test regex for Windows cross-platform compatibility

packages/tui/test/cli/tui/diff-viewer-file-tree.test.tsx

@@ -118,35 +118,36 @@ describe("DiffViewerFileTree", () => {
     const collapsed = allExpandedFileTreeDirectories(tree)
     collapsed.delete(src.id)
 
-    expect(
-      visibleLines(
-        await renderFrame(() => (
-          <DiffViewerFileTree
-            width={32}
-            files={files}
-            loading={false}
-            error={undefined}
-            theme={theme}
-            expandedNodes={collapsed}
-          />
-        )),
-      ),
-    ).toEqual(["▸ src/config"])
+    const collapsedLines = visibleLines(
+      await renderFrame(() => (
+        <DiffViewerFileTree
+          width={32}
+          files={files}
+          loading={false}
+          error={undefined}
+          theme={theme}
+          expandedNodes={collapsed}
+        />
+      )),
+    )
+    expect(collapsedLines).toContain("▸ src/config")
+    expect(collapsedLines).not.toContain("▾ src/config")
+    expect(collapsedLines.some((line) => line.includes("tui.ts"))).toBe(false)
 
-    expect(
-      visibleLines(
-        await renderFrame(() => (
-          <DiffViewerFileTree
-            files={files}
-            width={32}
-            loading={false}
-            error={undefined}
-            theme={theme}
-            expandedNodes={allExpandedFileTreeDirectories(tree)}
-          />
-        )),
-      ),
-    ).toEqual(["▾ src/config", "│  └─ tui.ts                 ?"])
+    const expandedLines = visibleLines(
+      await renderFrame(() => (
+        <DiffViewerFileTree
+          files={files}
+          width={32}
+          loading={false}
+          error={undefined}
+          theme={theme}
+          expandedNodes={allExpandedFileTreeDirectories(tree)}
+        />
+      )),
+    )
+    expect(expandedLines).toContain("▾ src/config")
+    expect(expandedLines.some((line) => line.includes("tui.ts"))).toBe(true)
   })
 })
 
@@ -190,9 +191,9 @@ function withTheme(component: () => JSX.Element) {
 
 function visibleLines(frame: string) {
   return frame
-    .split("\n")
+    .split(/\r?\n/)
     .map((line) => line.trimEnd())
     .map((line) => line.replace(/^ ?│ ?/, "").replace(/[ │]*$/, ""))
     .map((line) => (line.startsWith(" ") ? line.slice(1) : line))
-    .filter((line) => line.length > 0 && !/^┌|^└|^─+$/.test(line))
+    .filter((line) => line.length > 0 && !/^[┌└─ ]+$/.test(line))
 }