feat: "Start Steam silently in desktop mode" is opt-in (it was always on); an existing systemd unit counts as on and is migrated by the update

CHANGELOG.md

@@ -7,7 +7,7 @@ one per merged pull request.
 
 ## 2.11.0 - 2026-10-01
 
-- `5da1833` **feat: "Start Steam silently" sub-option: under the SteamOS conversion (`silent`, on by default, as before) and under Gaming on NVIDIA (`nvsilent`, opt-in, not together with Big Picture); the SteamOS one is called "Start Steam silently in desktop mode" and is always shown, also on a Steam Machine; it is Steam's own autostart entry (`~/.config/autostart/steam.desktop`), so Steam's setting "Run Steam when my computer starts" follows it**
+- `5da1833` **feat: "Start Steam silently" sub-option: under the SteamOS conversion (`silent`, opt-in now: it was always on before; an existing one is moved from its systemd unit to the autostart entry by the "update") and under Gaming on NVIDIA (`nvsilent`, opt-in, not together with Big Picture); the SteamOS one is called "Start Steam silently in desktop mode" and is always shown, also on a Steam Machine; it is Steam's own autostart entry (`~/.config/autostart/steam.desktop`), so Steam's setting "Run Steam when my computer starts" follows it**
 - **feat: "Steam Deck/Machine icons" (`glyphs`) is a sub-option of the SteamOS conversion, like "Start Steam silently in desktop mode": it only changes gaming mode**
 
 ## 2.10.0 - 2026-10-01