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/protect/protect.go

@@ -73,8 +73,8 @@ func New(host string, rtspPort int, verifyTLS bool) (*Client, error) {
 // returns the CSRF token in a response header on successful login.
 func (c *Client) Login(ctx context.Context, username, password string) error {
 	body, _ := json.Marshal(map[string]any{
-		"username": username,
-		"password": password,
+		"username":   username,
+		"password":   password,
 		"rememberMe": true,
 	})
 	url := fmt.Sprintf("https://%s/api/auth/login", c.host)
@@ -109,12 +109,12 @@ type bootstrap struct {
 		State           string `json:"state"`
 		IsRTSPEnabled   bool   `json:"isRtspEnabled"`
 		ChannelsWrapper []struct {
-			ID          int    `json:"id"`
-			Name        string `json:"name"`
-			Width       int    `json:"width"`
-			Height      int    `json:"height"`
-			IsRTSPEnabled bool `json:"isRtspEnabled"`
-			RTSPAlias   string `json:"rtspAlias"`
+			ID            int    `json:"id"`
+			Name          string `json:"name"`
+			Width         int    `json:"width"`
+			Height        int    `json:"height"`
+			IsRTSPEnabled bool   `json:"isRtspEnabled"`
+			RTSPAlias     string `json:"rtspAlias"`
 		} `json:"channels"`
 	} `json:"cameras"`
 }