feat(dashboard): berth-heat widget + investor-default surfacing

Step 6 minimal-but-functional per PRE-DEPLOY-PLAN § 1.6.

Berth Heat — new widget showing top 15 berths by active interest
count via the interest_berths junction (non-primary links included so
multi-berth deals warm every berth in their bundle). Investor-friendly
demand-pressure view; the ranked-table shape exports cleanly to PDF/
CSV. Future heatmap viz reads the same shape via /api/v1/dashboard/
berth-heat.

Defaults flipped for investor-friendliness:
- kpi_pipeline_value → defaultVisible (currency-aware headline number).
- source_conversion → defaultVisible (conversion funnel by source;
  reads the inquiry → client linkage from Step 3).
- berth_heat → defaultVisible.

Pipeline-velocity-over-time + true heatmap viz deferred. pipeline_funnel
covers snapshot stage breakdowns; over-time velocity warrants its own
design pass.

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

src/components/dashboard/widget-registry.tsx

@@ -15,6 +15,7 @@ import dynamic from 'next/dynamic';
 
 import { ActiveDealsTile } from './active-deals-tile';
 import { ActivityFeed } from './activity-feed';
+import { BerthHeatWidget } from './berth-heat-widget';
 import { HotDealsCard } from './hot-deals-card';
 import { PipelineValueTile } from './pipeline-value-tile';
 import { WebsiteGlanceTile } from './website-glance-tile';
@@ -122,10 +123,13 @@ export const DASHBOARD_WIDGETS: readonly DashboardWidget[] = [
   {
     id: 'kpi_pipeline_value',
     label: 'Pipeline Value',
-    description: 'Compact tile: total berth value of active deals (USD).',
+    description: 'Total berth value of active deals, converted to the port default currency.',
     render: () => <PipelineValueTile />,
     group: 'rail',
-    defaultVisible: false,
+    // Flipped on by default 2026-05-14 — the dashboard wave prioritized
+    // investor-facing tiles, and this is the headline number leadership
+    // looks at first.
+    defaultVisible: true,
   },
 
   // ── Charts (main area) ──────────────────────────────────────────────
@@ -175,7 +179,18 @@ export const DASHBOARD_WIDGETS: readonly DashboardWidget[] = [
     description: 'Win rate per lead source — which channels deliver buyers, not just leads.',
     render: () => <SourceConversionChart />,
     group: 'chart',
-    defaultVisible: false,
+    // Flipped on 2026-05-14 — investor-facing conversion-funnel-by-source
+    // surface (PRE-DEPLOY-PLAN § 1.6.23). Reads inquiry → client linkage
+    // (clients.source_inquiry_id) added in migration 0065.
+    defaultVisible: true,
+  },
+  {
+    id: 'berth_heat',
+    label: 'Berth Heat',
+    description: 'Top 15 berths by active interest count. Investor-friendly demand pressure view.',
+    render: () => <BerthHeatWidget />,
+    group: 'chart',
+    defaultVisible: true,
   },
   {
     id: 'website_analytics',