Pin sidebar foot to the page bottom; cap the chip list at 560px

src/uwudash_mk3/static/styles.css

@@ -47,8 +47,7 @@ body {
 .sidebar {
   width: 220px;
   flex: 0 0 220px;
-  height: 560px;
+  height: 100vh;
-  max-height: 100vh;
   position: sticky;
   top: 0;
   overflow-y: auto;
@@ -68,6 +67,7 @@ body {
   gap: 8px;
   flex: 1;
   min-height: 0;
+  max-height: 560px;
   overflow-y: auto;
   scrollbar-width: thin;
   scrollbar-color: var(--border) transparent;
@@ -94,7 +94,7 @@ body {
 .service-btn .sub { display: block; font-size: 11px; color: var(--muted); }
 .service-btn.disabled { opacity: 0.5; }
 
-.sidebar-foot { margin-top: 12px; }
+.sidebar-foot { margin-top: auto; }
 
 .user-chip {
   display: flex;