fix v1.37.3: true dashed open boundary, rendered above the glow

- outlineWithout trims the rooms' solid strokes under open stretches
  (.room.noedge kills the polygon stroke incl. hover; trimmed
  .room-outline path draws the remaining walls)
- dash color follows the space stroke color; openwalls layer moved
  after the glow layer
- +1 unit test (105); smoke_openwall extended; docs same-commit

src/styles.ts

@@ -545,12 +545,23 @@ export const cardStyles = css`
     .stage.markup.tool-openwall { cursor: default; }
     .stage.markup.tool-openwall.wallhot { cursor: pointer; }
     .openwall {
-      stroke: var(--card-background-color, var(--hp-bg, #fff));
-      stroke-width: 3.2;
+      stroke: var(--ow-stroke, var(--hp-muted));
+      stroke-width: 2.5;
       stroke-dasharray: 7 7;
+      stroke-linecap: butt;
       pointer-events: none;
       opacity: 0.9;
     }
+    /* rooms with open stretches: the polygon's own stroke is fully off
+       (hover included) — the trimmed .room-outline path draws the walls */
+    .room.noedge {
+      stroke-opacity: 0 !important;
+    }
+    .room-outline {
+      fill: none;
+      stroke-width: 2.5;
+      pointer-events: none;
+    }
     .openwalls.hot .openwall {
       stroke: #ffc14d;
       opacity: 1;