feat(leads): build lead detail page with full lead information

[Rishavraaj]

Summary

• Clicking a lead in the list now navigates to a dedicated detail page
• Detail page shows all lead information with a sidebar for key fields

Changes

apps/web

• query-options.ts: add getLead(id) query option
• app/(app)/leads/[id]/page.tsx: new page with server-side prefetch and metadata
• components/Leads/LeadDetail.tsx: full lead detail component
  • Contact info section: email, phone, company, title, LinkedIn link
  • Sidebar: status badge, source, ICP profile link, campaign link, contact link, deal link, created date
  • Actions: Convert to Deal button, Delete button
• components/Leads/LeadsList.tsx: wire onRowClick to navigate to /leads/[id]

Test plan

• Click a lead row → navigates to /leads/<id>
• Detail page shows name, email, company, title, LinkedIn
• Sidebar shows status, source, linked ICP/campaign/contact/deal
• Convert to Deal button works and updates status
• Delete button removes lead and redirects to /leads
• Page title reflects lead name

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