Detail panes: poster top right, title and facts left, plot below; sextant rendering

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

internal/ui/app.go

@@ -4,6 +4,7 @@ package ui
 import (
 	"context"
 	"fmt"
+	"os"
 	"strings"
 	"time"
 
@@ -44,6 +45,7 @@ type App struct {
 	probes   []probe
 
 	covers     bool // poster thumbnails enabled
+	coverStyle coverStyle
 	coverCache *coverCache
 }
 
@@ -89,6 +91,7 @@ func New(cfg *config.Config) *App {
 		state:    map[string]serviceState{},
 
 		covers:     cfg.UI.ShowCovers(),
+		coverStyle: coverStyleFor(cfg.UI.CoverStyle, os.Getenv),
 		coverCache: newCoverCache(),
 	}