feat: IMAP mail sync with thread-to-contact matching (PRD §6.1)

Real IMAP connection via imapflow library:
- Connects to IMAP server (IMAPFlow, TLS on port 993)
- Fetches recent messages (configurable limit, default 20)
- Extracts: from, fromEmail, subject, date, snippet (200 chars)
- Thread-to-contact matching (PRD §6.1):
  1. Match sender email against persons table
  2. If no person match, extract domain and match against company.website
  3. Returns matchedCompany + matchedPerson for each email
- Audit-logged (action: crm.mailsync:imap)
- Zod validated (host, port, user, password, folder, limit)
- 502 on IMAP connection failure with detail
- 400 on validation failure

Tested: invalid creds → 502 'IMAP connection failed', missing host → 400

skills/design/design-systems/style-skills/dashboard/DESIGN.md

@@ -0,0 +1,55 @@
+---
+name: Dashboard
+colors:
+  primary: "#0C5CAB"
+  secondary: "#0a4a8a"
+  success: "#10b981"
+  warning: "#f59e0b"
+  danger: "#ef4444"
+  surface: "#09090b"
+  text: "#fafafa"
+  neutral: "#09090b"
+typography:
+  h1:
+    fontFamily: "IBM Plex Sans"
+    fontSize: 2rem
+  body-md:
+    fontFamily: "IBM Plex Sans"
+    fontSize: 1rem
+  label-caps:
+    fontFamily: "IBM Plex Sans"
+    fontSize: 0.75rem
+  sourceScale: "12/14/16/20/24/32"
+  weights: "100, 200, 300, 400, 500, 600, 700, 800, 900"
+rounded:
+  sm: 4px
+  md: 8px
+spacing:
+  sm: 8px
+  md: 16px
+  sourceScale: "8pt baseline grid"
+---
+
+## Overview
+
+Dark-themed cloud-platform aesthetic with modular grids, glass-like panels, and strong data hierarchy for productivity dashboards.
+
+## Style Foundations
+
+- **Visual style:** modern, clean, cloud-platform aesthetic (Heroku/Vercel/GitHub inspired), dark theme, subtle gradients, soft shadows, glass-like panels, rounded components
+- **Typography scale:** 12/14/16/20/24/32
+- **Typography fonts:** primary=IBM Plex Sans, display=IBM Plex Sans, mono=IBM Plex Sans
+- **Typography weights:** 100, 200, 300, 400, 500, 600, 700, 800, 900
+- **Color palette:** primary, neutral, success, warning, danger
+- **Spacing scale:** 8pt baseline grid
+
+## Colors
+
+- **Primary (#0C5CAB):** Token from style foundations.
+- **Secondary (#0a4a8a):** Token from style foundations.
+- **Success (#10b981):** Token from style foundations.
+- **Warning (#f59e0b):** Token from style foundations.
+- **Danger (#ef4444):** Token from style foundations.
+- **Surface (#09090b):** Token from style foundations.
+- **Text (#fafafa):** Token from style foundations.
+- **Neutral (#09090b):** Derived from the surface token for official format compatibility.