android: the downloads say so in the shade

A Save still running with the app in the background now posts a progress
notice — how many files, the one it is on, a bar, Stop all and Open — and
takes it down when the queue empties. It sits on its own low-importance
channel so it can be silenced without silencing the player's card, and
rides its own dataSync foreground service rather than the media one: a
mediaPlayback service stops itself when the bar empties, a download is not
playback, and nothing else was keeping the process alive for a Save with
nothing playing — which is how the first real Save died, four tracks in.
Stop all goes through the same cancel(id) a row's tap takes, and Transfers
grew the matching button beside Clear finished. The walk pushes two rows
straight into the transfer store and reads the real notification back out
of `dumpsys notification`, without fetching anything.

src/mobile/Mobile.svelte

@@ -34,6 +34,7 @@
     import Transfers from "./screens/Transfers.svelte";
     import Diagnostics from "./screens/Diagnostics.svelte";
     import { transfers, bindTransfers, active as activeTransfers } from "./transfers.svelte.js";
+    import { xfernote, syncShade, bindXferNote } from "./xfernote.svelte.js";
     import { bindHome } from "./home.svelte.js";
     import Stub from "./screens/Stub.svelte";
     import { lib, loadLibrary, refreshRecents, albumById, albumsBy, watchLibrary } from "./lib.svelte.js";
@@ -148,6 +149,14 @@
         });
     });
 
+    /* ── the shade's download notice follows the transfer store ───────
+       An effect, not a hook off the download event: the effect tracks the
+       store itself, progress ticks and all, so a row written straight into
+       it — the walk, with nothing fetched — drives the notice exactly as a
+       real one does. It reads the store and never the notice's own record,
+       which is why that record is a plain object. */
+    $effect(() => { syncShade(); });
+
     /* ── the card gets the cover once the thumbnail has landed ───────── */
     $effect(() => {
         const k = player.album?.art_path;
@@ -213,6 +222,7 @@
         bindNet();
         watchLibrary();
         bindTransfers();
+        bindXferNote();
         bindHome();
         bindImporter();
         bindShare();
@@ -223,7 +233,7 @@
         setTimeout(() => { api.libraryArtPrewarm([360]).catch(() => {}); }, 8000);
         /* the probe handle — the desktop has __soulstream for the same reason:
            tests/mobile/smoke.mjs drives the real app through it */
-        window.__ss = { nav, top, go, push, back, openSheet, closeSheet, openHalf, closeHalf, player, lib, art, slsk, net, resolver, streamSong, streamCatalogAlbum, sources, api, transfers, pls, notice, importer, imp: { startFolder }, wifi: { downloadsAllowed, cellular }, next, prev, toggle, seekSecs, playQueueAt, patch, contacts, loadContacts };
+        window.__ss = { nav, top, go, push, back, openSheet, closeSheet, openHalf, closeHalf, player, lib, art, slsk, net, resolver, streamSong, streamCatalogAlbum, sources, api, transfers, xfn: xfernote, pls, notice, importer, imp: { startFolder }, wifi: { downloadsAllowed, cellular }, next, prev, toggle, seekSecs, playQueueAt, patch, contacts, loadContacts };
         return () => { if (unlisten) unlisten(); };
     });
 </script>