Replace sidebar style cycle button with 5 emoji icons

Swap the single cycle button for individual emoji per theme:
○ Default, ◆ Refined, ▮ Terminal, ❧ Codex, ❀ Sakura.
Active theme gets a highlighted state. Separated from the
light/dark toggle with a thin divider.

https://claude.ai/code/session_01Jv3c8GdaDQMm5WYwHUJMVe

1 files changed, 27 insertions, 9 deletions

diff --git a/frontend-vanilla/src/style.css b/frontend-vanilla/src/style.css
index 3061948..f58ae24 100644
--- a/frontend-vanilla/src/style.css
+++ b/frontend-vanilla/src/style.css
@@ -218,33 +218,47 @@ html {
 /* Quick controls row in sidebar footer */
 .sidebar-quick-controls {
   display: flex;
-  gap: 0.4rem;
+  align-items: center;
+  gap: 0.15rem;
   margin-bottom: 0.25rem;
 }
 
+.sidebar-controls-divider {
+  width: 1px;
+  height: 1rem;
+  background: rgba(128, 128, 128, 0.25);
+  margin: 0 0.25rem;
+}
+
 .sidebar-icon-btn {
   background: none;
   border: none;
   cursor: pointer;
-  font-size: 0.75rem;
-  padding: 0.3rem 0.6rem;
-  border-radius: 6px;
+  font-size: 0.8rem;
+  padding: 0.25rem 0.35rem;
+  border-radius: 4px;
   color: var(--text-color);
-  opacity: 0.5;
+  opacity: 0.35;
   transition: opacity 0.15s, background 0.15s;
-  font-family: var(--font-sans);
+  font-family: inherit;
   text-transform: none;
-  font-weight: 500;
+  font-weight: 400;
   height: auto;
-  line-height: 1.3;
+  line-height: 1;
 }
 
 .sidebar-icon-btn:hover {
-  opacity: 1;
+  opacity: 0.8;
   background: rgba(255, 255, 255, 0.08);
   border: none;
 }
 
+.sidebar-icon-btn.active {
+  opacity: 1;
+  background: rgba(255, 255, 255, 0.15);
+  color: var(--text-color);
+}
+
 .theme-dark .sidebar-icon-btn {
   color: rgba(0, 0, 0, 0.87);
   border: none;
@@ -256,6 +270,10 @@ html {
   border: none;
 }
 
+.theme-dark .sidebar-icon-btn.active {
+  background: rgba(0, 0, 0, 0.12);
+}
+
 /* Main Content area - always fills full width (sidebar overlays) */
 .main-content {
   width: 100%;