Teach spillover in the matrix views

Tree nodes now carry referrerId, so positions placed by spillover (their
referrer differs from their matrix parent) get a teal "spillover · ref
#N" tag on cards in both the member dashboard and admin matrix, plus a
legend entry. When a member is unqualified but has spillover positions
under them — the classic "why do I have 2 under me but no checkmark?"
state — a callout explains that spillover grows the matrix but only
members joining with their own ID count toward 2/2, and points them at
their share link.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

public/my.html

@@ -6,7 +6,7 @@
 <section id="dash" class="hidden">
 <div style="display:flex;justify-content:space-between;align-items:center;gap:14px;flex-wrap:wrap;margin-bottom:6px"><div><div class="eyebrow">Member position</div><h1 style="margin:6px 0 0">Position <span class="gold" id="dTitle">#—</span> <span id="dVerified" class="live-badge" style="vertical-align:middle;margin-left:8px"><span class="dot"></span> Verified on-chain</span> <span id="dQualified"></span></h1></div><button id="switchId" class="btn btn-secondary btn-sm">Look up another ID</button></div>
 <div id="dFacts" class="facts" style="grid-template-columns:repeat(3,1fr);margin:18px 0"></div>
-<div class="table-card" style="margin-bottom:18px"><div style="display:flex;justify-content:space-between;gap:12px;align-items:flex-start;flex-wrap:wrap"><div><h2 style="margin:0 0 4px">Your team</h2><p style="color:var(--muted);font-size:13px;margin:0 0 14px">Your position's matrix — the rollup line on each card counts everyone underneath, all the way down. Click a position to drill into that leg. Open slots are where the next placements land.</p></div><button id="dTreeToggle" class="btn btn-secondary btn-sm">List view</button></div><div id="dTreeNav" style="display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin-bottom:12px"></div><div id="dTree"></div><p class="micro" style="margin:14px 0 0"><span class="mtp-qmark" style="position:static;display:inline-grid;vertical-align:middle">✓</span> qualified (2/2 directs) · <span class="mt-badge mt-prem">P</span> Premium · <span class="mt-badge">S</span> Standard · ⬇ everyone below that position (all generations) and the POL they've earned</p></div>
+<div class="table-card" style="margin-bottom:18px"><div style="display:flex;justify-content:space-between;gap:12px;align-items:flex-start;flex-wrap:wrap"><div><h2 style="margin:0 0 4px">Your team</h2><p style="color:var(--muted);font-size:13px;margin:0 0 14px">Your position's matrix — the rollup line on each card counts everyone underneath, all the way down. Click a position to drill into that leg. Open slots are where the next placements land.</p></div><button id="dTreeToggle" class="btn btn-secondary btn-sm">List view</button></div><div id="dTreeNav" style="display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin-bottom:12px"></div><div id="dTree"></div><p class="micro" style="margin:14px 0 0"><span class="mtp-qmark" style="position:static;display:inline-grid;vertical-align:middle">✓</span> qualified (2/2 directs) · <span class="mt-badge mt-prem">P</span> Premium · <span class="mt-badge">S</span> Standard · ⬇ everyone below that position (all generations) and the POL they've earned · <span style="color:var(--teal)">↧ spillover</span> = placed there by upline activity; only members who join with a position's own ID count toward its 2/2</p><div id="dSpillNote" class="hidden"></div></div>
 <div class="table-card" style="margin-bottom:18px"><h2 style="margin:0 0 4px">Share this position</h2><div id="dShare"></div></div>
 <div class="table-card" style="margin-bottom:18px"><h2 style="margin:0 0 4px">Payments received</h2><p style="color:var(--muted);font-size:13px;margin:0 0 10px">Every payment your position has received, straight from the smart contract.</p><div id="dIncome"></div></div>
 <div class="table-card"><h2 style="margin:0 0 4px">Your lineage</h2><p id="dLineage" style="color:var(--muted);font-size:14px;line-height:1.8;margin:8px 0 0"></p></div>