Tidy the sidebar down from five panels to four

Each round added a panel, and the sidebar became five identical dark accordions
with no hierarchy between them — which is the polish debt I've been pointing at
for a while without paying it down.

Session Standings and Hand History were always two views of the same log, so
they're one Session panel now, with subheads and the export and clear buttons
at the bottom where they act on both. Base pot amount is the pre-live-betting
way of working, so it moves into a "Without live betting" disclosure inside
Table Setup rather than sitting between two settings a dealer actually touches.
Panels are ordered by how often they're opened, and the hints are shorter.

Also stops "Small blind" wrapping onto two lines beside its input, which made
the pair look like a mistake rather than a pair.

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_015bnp7xKUPFFSpwkYNFaPgb

JoshHeaps.Net/wwwroot/css/casino/holdem.css

@@ -872,6 +872,46 @@ body {
     gap: 0.7rem;
 }
 
+/* A heading inside a panel, so one panel can hold two related things — the
+   standings and the hand log are two views of the same session — without needing
+   two identical-looking accordions to say so. */
+.panelSubhead {
+    margin: 0.2rem 0 0;
+    color: #d8b46a;
+    font-size: 0.68rem;
+    font-weight: 600;
+    letter-spacing: 0.09em;
+    text-transform: uppercase;
+}
+
+.panelSubhead + * {
+    margin-top: -0.2rem;
+}
+
+/* Nested disclosure for the things a dealer sets once and then forgets, kept out
+   of the way of the settings they actually touch. */
+.subPanel {
+    border-top: 1px solid #2c2c2c;
+    padding-top: 0.5rem;
+}
+
+.subPanel summary {
+    cursor: pointer;
+    color: #8f8f8f;
+    font-size: 0.78rem;
+}
+
+.subPanel summary:hover {
+    color: #c5c5c5;
+}
+
+.subPanelBody {
+    display: flex;
+    flex-direction: column;
+    gap: 0.5rem;
+    padding-top: 0.6rem;
+}
+
 .fieldRow {
     display: flex;
     align-items: center;
@@ -1390,11 +1430,18 @@ body.hasActionBar #holdemSidebar {
 .blindsRow .fieldRow {
     flex: 1 1 120px;
     min-width: 0;
+    gap: 0.4rem;
+}
+
+/* "Small blind" broke onto two lines beside its input, which made the pair look
+   like a mistake rather than a pair. */
+.blindsRow .fieldRow > span {
+    white-space: nowrap;
 }
 
 .blindsRow input {
     min-width: 0;
-    width: 5rem;
+    width: 3.4rem;
 }
 
 /* ---------- Toasts ---------- */