Show each frame's flag and stars on the develop roll

FR-UI-5's 2026-09-19 amendment asks for the rating and flag wherever they
can be set and on the roll's cells, so that stepping along a set in develop
shows what has been judged. The roll drew thumbnails only, so the keys that
now judge the open photograph left no trace on its neighbours.

Each roll cell carries a small badge with a tick or a cross and a star
count, drawn only when there is something to show, in shapes and a number
rather than colours (NFR-A11Y-3).

ui/dr-ui/ui/library.slint

@@ -1029,6 +1029,39 @@ export component PhotoRoll inherits Rectangle {
                         visible: cell.has-thumb;
                     }
 
+                    // TRACES: FR-UI-5 | FR-CULL-4 | NFR-A11Y-3
+                    // The judgement, on the roll as on the grid, so stepping
+                    // along a set in develop shows what has been judged
+                    // (FR-UI-5, amended 2026-09-19). A tick or a cross and a
+                    // star count: shapes and a number, not hues.
+                    if cell.flag > 0 || cell.rating > 0: Rectangle {
+                        x: 3px;
+                        y: 3px;
+                        height: 14px;
+                        width: marks.preferred-width + 6px;
+                        background: Theme.surface.with-alpha(0.85);
+                        border-radius: 7px;
+
+                        marks := HorizontalLayout {
+                            x: 3px;
+                            spacing: 2px;
+                            alignment: start;
+
+                            if cell.flag > 0: Icon {
+                                name: cell.flag == 2 ? "cross" : "check";
+                                ink: cell.flag == 2 ? Theme.warn-ink : Theme.active;
+                                size: 9px;
+                                y: (parent.height - self.height) / 2;
+                            }
+                            if cell.rating > 0: Text {
+                                text: "★" + cell.rating;
+                                color: Theme.ink;
+                                font-size: 9px;
+                                vertical-alignment: center;
+                            }
+                        }
+                    }
+
                     TouchArea {
                         mouse-cursor: pointer;
                         clicked => { root.pick(i); }