Smoother daemon: no-op reloads, batched placement, muted audio, graceful teardown

- Skip stream restarts when a reload resolves to the identical wall
  (same URLs, tile geometry, player settings) — saving an unrelated
  config edit no longer blanks the screen.
- Replace per-tile placement polling (a swaymsg fork per tile per second,
  plus 150ms get_tree polling per tile at startup) with one shared loop:
  a single get_tree snapshot per tick, re-placing only drifted windows,
  relaxing to a 2s tick once settled.
- Mute streams by default (--no-audio) to skip an audio decoder per
  stream; opt back in with player.audio: true.
- Graceful, parallel mpv teardown via cmd.Cancel/WaitDelay, fixing the
  double-Wait race between Stop and Supervise and cutting worst-case
  layout switches from ~2s x N streams to ~2s total.
- status: probe mpv IPC outside the daemon mutex so a slow probe can't
  block layout switches.
- View sync: reuse the Protect session across ticks (re-login only on
  expiry) and pick up view_refresh_seconds changes without a restart.
- Health strikes keyed by player, not slot, so they never carry across
  layout switches; prune stale entries.
- New `rtsp-streamer reload` CLI; fix dead sort in `layout ls`; back off
  on persistent control-socket accept errors; fsync config before the
  atomic rename (SD-card power-cut safety); bump IPC client deadline;
  gofmt stragglers.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

cmd/rtsp-streamer/commands.go

@@ -328,7 +328,8 @@ func layoutCmd() *cobra.Command {
 				names = append(names, l.Name)
 			}
 			sort.Strings(names)
-			for _, l := range cfg.Layouts {
+			for _, name := range names {
+				l := cfg.LayoutByName(name)
 				marker := "  "
 				if l.Name == cfg.ActiveLayout {
 					marker = "* "
@@ -374,6 +375,27 @@ func layoutCmd() *cobra.Command {
 	return c
 }
 
+// reloadCmd tells the running daemon to re-read its config and re-apply the
+// active layout. The daemon leaves streams untouched when nothing material
+// changed, so this is safe to run casually.
+func reloadCmd() *cobra.Command {
+	return &cobra.Command{
+		Use:   "reload",
+		Short: "Reload the running daemon's config and re-apply the layout",
+		RunE: func(cmd *cobra.Command, _ []string) error {
+			resp, err := ipc.Send(ipc.Request{Cmd: "reload"})
+			if err != nil {
+				return err
+			}
+			if !resp.OK {
+				return fmt.Errorf("%s", resp.Error)
+			}
+			fmt.Printf("Reloaded. Active layout: %s (%d streams)\n", resp.ActiveLayout, len(resp.Slots))
+			return nil
+		},
+	}
+}
+
 // statusCmd asks the running daemon for slot health.
 func statusCmd() *cobra.Command {
 	return &cobra.Command{