Per-tile stream quality (high/low), fps cap, latency flags

Cameras carry multiple stream URLs (streams: high/medium/low); each
tile picks one via Quality (auto/high/low). Small tiles can pull the
low substream to cut Pi decode load. discover --enable-rtsp takes a
comma list (high,low), enables each channel, records all enabled ones.
TUI: q cycles a tile quality (shown in the tile); discover enables
high+low. Player: --framedrop + low-delay demuxer flags; player.max_fps.

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

internal/tui/view.go

@@ -107,13 +107,27 @@ func (m *model) viewLayoutEdit() string {
 	b.WriteString("\n\n")
 	b.WriteString(strings.Join([]string{
 		hkey("click", "assign cell") + "    " + hkey("drag a tile", "resize") + "  (mouse)",
-		hkey("←↑↓→/hjkl", "move") + "    " + hkey("enter", "assign") + "    " + hkey("c", "clear"),
+		hkey("←↑↓→/hjkl", "move") + "    " + hkey("enter", "assign") + "    " + hkey("c", "clear") + "    " + hkey("q", "quality"),
 		"resize tile  " + hkey("L/H", "wider/narrower") + "    " + hkey("J/K", "taller/shorter"),
 		"base grid  " + hkey("] [", "cols") + "    " + hkey("} {", "rows") + "    " + hkey("esc", "back"),
 	}, "\n"))
 	return b.String()
 }
 
+// qualityAbbrev shortens a quality name for the compact tile label.
+func qualityAbbrev(q string) string {
+	switch q {
+	case "high":
+		return "hi"
+	case "medium":
+		return "med"
+	case "low":
+		return "lo"
+	default:
+		return q
+	}
+}
+
 // renderGrid draws the base grid with tiles, camera labels, continuation marks
 // for spanned cells, and a highlighted cursor cell — a live picture of the wall.
 func (m *model) renderGrid(cols, rows int) string {
@@ -156,9 +170,17 @@ func (m *model) renderCell(l config.Layout, c, r, line int) string {
 			plain = padTo(truncate(label, cellW), cellW)
 		case isOrigin && line == 1:
 			cs, rs := t.Span()
+			info := ""
 			if cs > 1 || rs > 1 {
-				plain = padTo(fmt.Sprintf("%dx%d", cs, rs), cellW)
+				info = fmt.Sprintf("%dx%d", cs, rs)
 			}
+			if t.Quality != "" {
+				if info != "" {
+					info += " "
+				}
+				info += qualityAbbrev(t.Quality)
+			}
+			plain = padTo(info, cellW)
 			dim = true
 		default: // continuation cell of a spanned tile
 			plain = center("·", cellW)