fix(w-engine): sync palette when restoring wallpaper on startup

The startup restore relaunched linux-wallpaperengine for the last
selected wallpaper but never re-applied the still that Noctalia derives
its palette from, so colors after login came from whatever wallpaper the
shell restored on its own. Every other path that puts a wallpaper up
pairs launch() with syncPalette(); this one now does too.

Switching wallpapers away and back was the only way to correct it, since
that runs apply().

w-engine/start.luau

@@ -791,13 +791,17 @@ publishStatus()
 noctalia.runAsync(
 	"pkill linux-wallpaper 2>/dev/null; sleep 1; pkill -KILL linux-wallpaper 2>/dev/null; true",
 	function()
-		-- Bring back whatever was playing before the reload, cycle included.
+		-- Bring back whatever was playing before the reload, cycle included. The
+		-- palette is re-synced alongside the process: the shell restores its own
+		-- wallpaper on login, which drops the still we set for the live scene and
+		-- leaves the colors from whatever it picked instead.
 		for _, output in ipairs(noctalia.outputs()) do
 			local name = output.name
 			local id = data.current[name]
 			if type(id) == "string" and id ~= "" then
 				elapsed[name] = 0
 				launch(name, id)
+				syncPalette(name, id)
 			end
 		end
 		publishStatus()