feat: add render.py with render_treasure, tests passing

render.py

@@ -0,0 +1,29 @@
+import html
+
+_PLACEHOLDER = "...nothing yet. but i'm listening."
+
+_PANEL = (
+    "background:#0c0a12;border:1px solid #2a1f3d;border-radius:4px;"
+    "padding:10px;min-height:460px;"
+)
+_HEADER = (
+    "font-size:10px;letter-spacing:2px;text-transform:uppercase;color:#5a4570;"
+    "padding-bottom:6px;border-bottom:1px solid #1e1628;margin-bottom:8px;"
+)
+_ITEM = (
+    "background:#110d1a;border:1px solid #2a1f3d;border-left:2px solid #5a3a7a;"
+    "border-radius:0 3px 3px 0;padding:5px 8px;margin-bottom:6px;"
+    "font-size:11px;color:#9a80b8;line-height:1.4;"
+)
+_EMPTY = "font-size:11px;color:#4a3f56;font-style:italic;"
+
+
+def render_treasure(treasure: list[str]) -> str:
+    header = f'<div style="{_HEADER}">✦ Treasure</div>'
+    if not treasure:
+        body = f'<div style="{_EMPTY}">{_PLACEHOLDER}</div>'
+    else:
+        body = "".join(
+            f'<div style="{_ITEM}">{html.escape(m)}</div>' for m in treasure
+        )
+    return f'<div style="{_PANEL}">{header}{body}</div>'