style: palette swatch → (domain-hue redesign 2026-05-21)

Sidebar swatch now follows function family rather than S88 level, so the
palette is visually identifiable instead of monochromatically blue. Editor-group
rectangles in flow.json still follow S88 — only the registerType color changed.
Full table + rationale: superproject .claude/rules/node-red-flow-layout.md §10.0
and .claude/refactor/OPEN_QUESTIONS.md (2026-05-21 entry).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

dashboardAPI.html

@@ -4,7 +4,7 @@
 <script>
   RED.nodes.registerType('dashboardapi', {
     category: 'EVOLV',
-    color: '#4f8582',
+    color: '#7A8BA3',
     defaults: {
       name: { value: '' },
       enableLog: { value: true },