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/gradient/DESIGN.md

@@ -0,0 +1,55 @@
+---
+name: Gradient
+colors:
+  primary: "#990FFA"
+  secondary: "#E60076"
+  success: "#16A34A"
+  warning: "#D97706"
+  danger: "#DC2626"
+  surface: "#FFFFFF"
+  text: "#111827"
+  neutral: "#FFFFFF"
+typography:
+  h1:
+    fontFamily: "Space Grotesk"
+    fontSize: 2.25rem
+  body-md:
+    fontFamily: "Montserrat"
+    fontSize: 1rem
+  label-caps:
+    fontFamily: "JetBrains Mono"
+    fontSize: 0.75rem
+  sourceScale: "12/14/16/18/24/30/36"
+  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
+
+Smooth color transitions and gradient-rich surfaces for modern, playful interfaces with visual depth.
+
+## Style Foundations
+
+- **Visual style:** modern, playful
+- **Typography scale:** 12/14/16/18/24/30/36
+- **Typography fonts:** primary=Montserrat, display=Space Grotesk, mono=JetBrains Mono
+- **Typography weights:** 100, 200, 300, 400, 500, 600, 700, 800, 900
+- **Color palette:** primary, secondary, neutral, success, warning, danger
+- **Spacing scale:** 8pt baseline grid
+
+## Colors
+
+- **Primary (#990FFA):** Token from style foundations.
+- **Secondary (#E60076):** Token from style foundations.
+- **Success (#16A34A):** Token from style foundations.
+- **Warning (#D97706):** Token from style foundations.
+- **Danger (#DC2626):** Token from style foundations.
+- **Surface (#FFFFFF):** Token from style foundations.
+- **Text (#111827):** Token from style foundations.
+- **Neutral (#FFFFFF):** Derived from the surface token for official format compatibility.