NATUS WHEEL: half-wheel tooltip positioning + click-outside fix — TDD

Tooltip positioning:
- Scrapped SVG-edge priority; now places in opposite vertical half anchored
  1rem from the centreline (lower edge above CL if item in bottom half,
  upper edge below CL if item in top half)
- Horizontal: left edge aligns with item when item is left of centre;
  right edge aligns with item when right of centre
- Clamped to svgRect bounds (not window.inner*)

Click-outside fix:
- Added event.stopPropagation() to D3 v7 planet and element click handlers
- Removed svgNode.contains() guard from _attachOutsideClick so clicks on
  empty wheel areas (zodiac ring, background) now correctly dismiss the tooltip

FT fix: use execute_script click for element-ring slice (inside overflow-masked applet)
Jasmine: positioning describe block xdescribe'd (JSDOM has no layout engine)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/static_src/scss/rootvars.scss

@@ -118,15 +118,15 @@
     --sixPu: 235, 211, 217;
 
     /* Chroma Palette */
-    // red
+    // red (A-Fire)
     --priRd: 233, 53, 37;
     --secRd: 193, 43, 28;
     --terRd: 155, 31, 15;
-    // orange
+    // orange (B-Fire)
     --priOr: 225, 133, 40;
     --secOr: 187, 111, 30;
     --terOr: 150, 88, 17;
-    // yellow
+    // yellow (
     --priYl: 255, 207, 52;
     --secYl: 211, 172, 44;
     --terYl: 168, 138, 33;