chore(release): v0.3.0 — playlists + YouTube two-way sync

Bump VERSION to 0.3.0 and add the 0.3.0 release-notes entry (local playlists, watch
later as a playlist, YouTube mirror + two-way sync, sort + undo/redo, rail sorting).

frontend/src/lib/releaseNotes.ts

@@ -14,6 +14,21 @@ export interface ReleaseEntry {
 }
 
 export const RELEASE_NOTES: ReleaseEntry[] = [
+  {
+    version: "0.3.0",
+    date: "2026-06-16",
+    summary:
+      "Playlists — build your own, mirror your YouTube ones, and sync edits back to YouTube.",
+    features: [
+      "Local playlists: create named, ordered playlists, reorder by drag, and add videos straight from the feed or the player. Play a whole playlist with auto-advance and prev/next.",
+      "Watch later is now a built-in playlist — the bookmark button adds to it, and you can play and manage it like any other list.",
+      "Your YouTube playlists are mirrored in automatically and kept fresh, shown with a YouTube badge and an “open on YouTube” link.",
+      "Two-way YouTube sync: export a local playlist to YouTube, or push your edits (add, remove, reorder, rename) back to a linked playlist. Every push shows an estimate and a confirm first, because YouTube playlist writes are quota-heavy.",
+      "Edit mirrored playlists freely — your unsynced changes are protected from the automatic refresh, an “Unsynced” marker shows when you have pending edits, and “Reset to YouTube” discards them to reload the original.",
+      "Sort a playlist by title, duration or channel (ascending/descending) and optionally group by channel — with full undo/redo (buttons and Ctrl/Cmd+Z / Ctrl+Y).",
+      "The playlist list can be ordered by name, item count or total length (and float your unsynced lists to the top); it shows each list’s total length and remembers your selection.",
+    ],
+  },
   {
     version: "0.2.0",
     date: "2026-06-15",