NATUS WHEEL: tick lines + dual conjunction tooltip — TDD

- _computeConjunctions(planets, threshold=8) detects conjunct pairs
- Tick lines (nw-planet-tick) radiate from each planet circle outward
  past the zodiac ring; animated via attrTween; styled with --pri* colours
- planetEl.raise() on mouseover puts hovered planet on top in SVG z-order
- Dual tooltip: hovering a conjunct planet shows #id_natus_tooltip_2 beside
  the primary, populated with the hidden partner's sign/degree/retrograde data
- #id_natus_tooltip_2 added to home.html, sky.html, room.html
- _natus.scss: tick line rules + both tooltip IDs share all selectors;
  #id_natus_confirm gets position:relative/z-index:1 to fix click intercept
- NatusWheelSpec.js: T7 (tick extends past zodiac), T8 (raise to front),
  T9j (conjunction dual tooltip) in new conjunction describe block
- FT T3 trimmed to element-ring hover only; planet/conjunction hover
  delegated to Jasmine (ActionChains planet-circle hover unreliable in Firefox)

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

src/templates/apps/dashboard/home.html

@@ -22,5 +22,6 @@
         </div>
         <div id="id_tooltip_portal" class="token-tooltip" style="display:none;"></div>
         <div id="id_natus_tooltip" class="tt" style="display:none;"></div>
+        <div id="id_natus_tooltip_2" class="tt" style="display:none;"></div>
     {% endif %}
 {% endblock content %}