v4: a playlist's editor has a URL, as a dump's has — it opened over the playlist's header as a state of the page, which a reload or a shared link lost, while a dump's editor is /@name/dumps/<slug>/edit. It is now /@name/playlists/<slug>/edit: Edit goes there, and Cancel or Save come back to the page in its place. Both paths render PlaylistDetail at the same place, so the playlist stays loaded, and a new slug keeps the view. Anyone who may not edit it gets the page, a guest the sign-in first. playlistPath takes the view, and parsePagePath reads it, so its link has no preview, as a dump editor's has none.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

shared/test/paths.test.ts

@@ -66,7 +66,18 @@ Deno.test("parsePagePath: what a path under a user names", () => {
     kind: "playlist",
     username: "bob",
     slug: "mix",
+    edit: false,
   });
+  assertEquals(parsePagePath("/@bob/playlists/mix/edit"), {
+    kind: "playlist",
+    username: "bob",
+    slug: "mix",
+    edit: true,
+  });
+  assertEquals(
+    playlistPath({ ownerUsername: "bob", slug: "mix" }, "edit"),
+    "/@bob/playlists/mix/edit",
+  );
   for (
     const other of [
       "/",
@@ -78,7 +89,7 @@ Deno.test("parsePagePath: what a path under a user names", () => {
       "/@bob/nope",
       "/@bob/follow/users",
       "/@bob/dumps/x/y",
-      "/@bob/playlists/x/edit",
+      "/@bob/playlists/x/y",
       "/@bob/%E0%A4%A",
     ]
   ) {
@@ -96,6 +107,7 @@ Deno.test("handles: a user from another instance is /@name@host", () => {
     kind: "playlist",
     username: "alice@music.example",
     slug: "mix",
+    edit: false,
   });
   assertEquals(parsePagePath("/@alice%40music.example"), {
     kind: "user",