feat: doom runs inline as .doom/doom.sh instead of a floating draggable window

cds into a fake .doom folder (breadcrumb + file listing match every other page); .. is a real link back to wherever you typed doom from, so leaving is just normal pjax navigation.

assets/css/custom.css

@@ -276,48 +276,17 @@ body:not(.home) .menu { display: none; }
 }
 .proj-path__seg--last { font-weight: 700; }
 
-/* secret `doom` — a small window floating over the site, sized to the 4:3 game */
-.doom-window {
-  position: fixed;
-  top: 50%;
-  left: 50%;
-  transform: translate(-50%, -50%);
-  width: min(92vw, 640px);
-  z-index: 9999;
-  display: flex;
-  flex-direction: column;
-  background: #000;
-  border: 1px solid var(--color-text-primary);
-  box-shadow: 0 12px 48px rgba(0, 0, 0, 0.45);
-}
-.doom-window__bar {
-  display: flex;
-  align-items: center;
-  justify-content: space-between;
-  padding: 0.25rem 0.25rem 0.25rem 0.6rem;
-  font-family: var(--font-family-mono);
-  font-size: var(--font-size-small);
-  color: #fff;
-  background: #000;
-  cursor: move;
-  user-select: none;
-}
-.doom-window__close {
-  cursor: pointer;
-  color: #fff;
-  background: none;
-  border: none;
-  font: inherit;
-  line-height: 1;
-  padding: 0 0.6ch;
-}
-.doom-window__close:hover { color: #000; background: #fff; }
-.doom-window iframe {
+/* secret `doom` — runs inline as doom.sh inside a fake .doom folder, same
+   file-listing chrome as any other page. sized to the classic 4:3 game. */
+.doom-player {
   width: 100%;
   aspect-ratio: 4 / 3;
-  height: auto;
-  border: 0;
   background: #000;
+}
+.doom-player iframe {
+  width: 100%;
+  height: 100%;
+  border: 0;
   display: block;
 }