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/default/DESIGN.md

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+# Neutral Modern
+
+> Category: Starter
+> A clean, product-oriented default. Use when the brief doesn't call for a
+> specific mood — good for B2B tools, dashboards, and utility pages.
+
+## Visual Theme & Atmosphere
+Calm, functional, quietly confident. No ornament. Content-first, chrome-second.
+
+## Color Palette & Roles
+- **Background:** `#FAFAFA`
+- **Foreground:** `#111111`
+- **Accent:** `#2F6FEB` (cobalt) — primary CTAs, links, one hero element per screen
+- **Muted:** `#6B6B6B` — secondary text, captions
+- **Border:** `#E5E5E5`
+- **Surface:** `#FFFFFF` — cards, modals
+- **Success:** `#17A34A`, **Warn:** `#EAB308`, **Danger:** `#DC2626`
+Never pure black; never pure white for backgrounds.
+
+## Typography Rules
+- **Display / headings:** `'Inter', -apple-system, system-ui, sans-serif`, weight 600
+- **Body:** `'Inter', -apple-system, system-ui, sans-serif`, weight 400
+- **Mono:** `ui-monospace, 'JetBrains Mono', monospace`
+- Scale (px): 12 · 14 · 16 · 20 · 24 · 32 · 48 · 64
+- Line-height: 1.5 for body, 1.2 for headings
+- Letter-spacing: -0.01em on display sizes ≥32px
+
+## Component Stylings
+- **Buttons:** 8px radius, 10px padding-block, 16px padding-inline. Primary = cobalt fill, white label. Secondary = 1px border, transparent fill.
+- **Cards:** white, 1px border, 12px radius, 20px internal padding, no shadow by default.
+- **Inputs:** 1px border, 8px radius, 10px vertical padding, cobalt border on focus.
+- **Links:** cobalt, no underline, underline on hover.
+
+## Layout Principles
+- 12-column grid, 1200px max-width, 24px gutters.
+- Hero: 40–60vh. Content top-biased, never centered vertically.
+- Sections: 80px top+bottom spacing desktop, 48px tablet, 32px phone.
+- Use whitespace as the main separator. Dividers only between unrelated top-level sections.
+
+## Depth & Elevation
+Two levels only:
+- **Flat (0):** default.
+- **Raised (1):** dropdowns, modals, floating buttons. 2px y-offset, 8px blur, foreground at 8% opacity.
+No neumorphism, no glassmorphism.
+
+## Do's and Don'ts
+- ✅ Let whitespace do the work.
+- ✅ One accent element per screen.
+- ✅ Sentence-case headings by default; title case only for brand names.
+- ❌ No gradients (except the accent → accent-at-80% on a hero, sparingly).
+- ❌ No drop shadows on inputs.
+- ❌ No more than three type sizes on one screen.
+
+## Responsive Behavior
+- **Desktop ≥ 1024px:** 12-col grid.
+- **Tablet 640–1023px:** 8-col grid, 16px gutters.
+- **Phone < 640px:** 4-col grid, 12px gutters; hero drops to 40vh.
+
+## Agent Prompt Guide
+- When in doubt, subtract. Fewer boxes, less chrome, more space.
+- Use the accent color sparingly — at most one hero accent and one CTA accent per screen.
+- Do not invent hex values outside this palette. If the request needs one, surface a warning comment in the artifact and use the closest existing token.