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.

crates/tauri-plugin-transfer-notice/permissions/autogenerated/reference.md

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+## Default Permission
+
+The downloads notice on the phone: `update` mirrors what Save is fetching,
+`clear` takes it down, and the two listener commands are what lets the page
+hear the notice's buttons (`addPluginListener`).
+
+#### This default permission set includes the following:
+
+- `allow-update`
+- `allow-clear`
+- `allow-registerListener`
+- `allow-removeListener`
+
+## Permission Table
+
+<table>
+<tr>
+<th>Identifier</th>
+<th>Description</th>
+</tr>
+
+
+<tr>
+<td>
+
+`transfer-notice:allow-clear`
+
+</td>
+<td>
+
+Enables the clear command without any pre-configured scope.
+
+</td>
+</tr>
+
+<tr>
+<td>
+
+`transfer-notice:deny-clear`
+
+</td>
+<td>
+
+Denies the clear command without any pre-configured scope.
+
+</td>
+</tr>
+
+<tr>
+<td>
+
+`transfer-notice:allow-registerListener`
+
+</td>
+<td>
+
+Enables the registerListener command without any pre-configured scope.
+
+</td>
+</tr>
+
+<tr>
+<td>
+
+`transfer-notice:deny-registerListener`
+
+</td>
+<td>
+
+Denies the registerListener command without any pre-configured scope.
+
+</td>
+</tr>
+
+<tr>
+<td>
+
+`transfer-notice:allow-removeListener`
+
+</td>
+<td>
+
+Enables the removeListener command without any pre-configured scope.
+
+</td>
+</tr>
+
+<tr>
+<td>
+
+`transfer-notice:deny-removeListener`
+
+</td>
+<td>
+
+Denies the removeListener command without any pre-configured scope.
+
+</td>
+</tr>
+
+<tr>
+<td>
+
+`transfer-notice:allow-update`
+
+</td>
+<td>
+
+Enables the update command without any pre-configured scope.
+
+</td>
+</tr>
+
+<tr>
+<td>
+
+`transfer-notice:deny-update`
+
+</td>
+<td>
+
+Denies the update command without any pre-configured scope.
+
+</td>
+</tr>
+</table>