fix: harden getStoragePath and keep CRLF endings

- Normalize the returned path to forward slashes so it matches what
  Storage.list() (glob) returns, instead of leaking `\` on Windows.
- Treat the storage root itself as "not inside", so passing a directory
  no longer yields an empty path that Storage.load() would open as a dir.
- Extract the containment check into isInsideDirectory() and drop the
  redundant isAbsolute(filepath) branch (path.resolve already handles it).
- Restore the repository's CRLF line endings in the nested fixture.

scripts/utils.ts

@@ -53,24 +53,29 @@ export function normalizeURL(url: string): string {
   }
 }
 
+function isInsideDirectory(rootDir: string, target: string): boolean {
+  const relative = path.relative(rootDir, target)
+
+  return (
+    relative !== '' &&
+    relative !== '..' &&
+    !relative.startsWith(`..${path.sep}`) &&
+    !path.isAbsolute(relative)
+  )
+}
+
 export function getStoragePath(filepath: string, rootDir: string): string {
   const root = path.resolve(rootDir)
-  const candidate = path.resolve(filepath)
-  const candidateRelative = path.relative(root, candidate)
-  const target =
-    path.isAbsolute(filepath) ||
-    (candidateRelative !== '..' &&
-      !candidateRelative.startsWith(`..${path.sep}`) &&
-      !path.isAbsolute(candidateRelative))
-      ? candidate
-      : path.resolve(root, filepath)
-  const relative = path.relative(root, target)
+  const fromWorkspace = path.resolve(filepath)
+  const target = isInsideDirectory(root, fromWorkspace)
+    ? fromWorkspace
+    : path.resolve(root, filepath)
 
-  if (relative === '..' || relative.startsWith(`..${path.sep}`) || path.isAbsolute(relative)) {
+  if (!isInsideDirectory(root, target)) {
     throw new Error(`Filepath "${filepath}" is outside the storage directory`)
   }
 
-  return relative
+  return path.relative(root, target).split(path.sep).join('/')
 }
 
 export function truncate(string: string, limit: number = 100) {

tests/__data__/input/playlist_format/nested/nested.m3u

@@ -1,5 +1,5 @@
-#EXTM3U
-#EXTINF:-1 tvg-id="",Zulu (720p)
-https://example.com/zulu.m3u8
-#EXTINF:-1 tvg-id="",Alpha (720p)
-https://example.com/alpha.m3u8
+#EXTM3U
+#EXTINF:-1 tvg-id="",Zulu (720p)
+https://example.com/zulu.m3u8
+#EXTINF:-1 tvg-id="",Alpha (720p)
+https://example.com/alpha.m3u8