feat: scroll-wheel zoom and click-to-select in radar

- Replace range dropdown with smooth scroll-wheel zoom on canvas
- Click dot on canvas to select it (white ring + name label)
- Click row in entity list to select on canvas
- Click again to deselect
- Selected row highlighted with blue accent in list
- Auto-scrolls list to keep selected row visible

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

static/style.css

@@ -2533,14 +2533,17 @@ table.ts-allegiance td:first-child {
   color: #ccc;
 }
 
-.radar-range-select {
-  background: #222;
-  color: #ccc;
-  border: 1px solid #444;
-  padding: 2px 4px;
+.radar-range-display {
+  color: #aaa;
   font-size: 0.75rem;
 }
 
+.radar-zoom-hint {
+  color: #555;
+  font-size: 0.7rem;
+  font-style: italic;
+}
+
 .radar-canvas {
   display: block;
   margin: 0 auto;
@@ -2578,6 +2581,16 @@ table.ts-allegiance td:first-child {
 
 .radar-entity-row:hover {
   background: #1a1a2a;
+  cursor: pointer;
+}
+
+.radar-entity-selected {
+  background: #1a2a3a;
+  border-left: 2px solid #4488ff;
+}
+
+.radar-entity-selected:hover {
+  background: #1a2a3a;
 }
 
 .re-color {