sync: interactive map canvas from private repo

- React Flow replaces custom SVG map (node dragging, edge creation, SSE sync)
- Redesigned QuickAddInput and EdgeExplanationModal (match SearchModal design)
- Selection highlighting with edge/node dimming
- Added tabBar prop to BasePaneProps and PaneHeaderProps
- Removed stale activeDelegations prop from QuickAddInput callers

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/components/layout/ThreePanelLayout.tsx

@@ -1073,7 +1073,6 @@ export default function ThreePanelLayout() {
       <QuickAddInput
         isOpen={showAddStuff}
         onClose={() => setShowAddStuff(false)}
-        activeDelegations={delegations}
         onSubmit={handleQuickAddSubmit}
       />
     </div>