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>

internal/ipc/ipc.go

@@ -61,7 +61,9 @@ func Send(req Request) (*Response, error) {
 		return nil, fmt.Errorf("cannot reach daemon (is it running?): %w", err)
 	}
 	defer conn.Close()
-	_ = conn.SetDeadline(time.Now().Add(5 * time.Second))
+	// Generous deadline: a reload that rebuilds the wall tears down and
+	// respawns every mpv before replying, and status probes each stream's IPC.
+	_ = conn.SetDeadline(time.Now().Add(30 * time.Second))
 
 	enc := json.NewEncoder(conn)
 	if err := enc.Encode(req); err != nil {