Ship persona shelves, Exact controls, and overlay author pipeline.

Add Leonid as a shelf-based example with preference_bias slider; support /persona new clone-to-overlay and UI-only delete.

Co-authored-by: Cursor <cursoragent@cursor.com>

Assets/assistent.css

@@ -669,9 +669,59 @@
 .sa-header-right {
     display: flex;
     align-items: center;
+    flex-wrap: wrap;
     gap: 0.4rem;
 }
 
+.sa-persona-wrap {
+    display: inline-flex;
+    align-items: center;
+    gap: 0.2rem;
+}
+
+.sa-persona-controls {
+    display: flex;
+    flex-wrap: wrap;
+    align-items: center;
+    gap: 0.55rem 0.85rem;
+    width: 100%;
+    order: 5;
+    padding: 0.15rem 0 0;
+}
+
+.sa-control-row {
+    display: inline-flex;
+    align-items: center;
+    gap: 0.4rem;
+    font-size: 0.78rem;
+    min-width: 11rem;
+}
+
+.sa-control-row label {
+    opacity: 0.75;
+    white-space: nowrap;
+}
+
+.sa-control-row input[type="range"] {
+    width: 7.5rem;
+    accent-color: color-mix(in srgb, #f0883e 70%, currentColor);
+}
+
+.sa-control-val {
+    font-variant-numeric: tabular-nums;
+    min-width: 2.4rem;
+    opacity: 0.85;
+}
+
+#sa_persona_delete:not([hidden]) {
+    opacity: 0.7;
+}
+
+#sa_persona_delete:hover {
+    opacity: 1;
+    color: #e06c75;
+}
+
 .sa-icon-btn {
     min-width: 2rem;
     padding-left: 0.45rem;