feat(leads): group leads by campaign as lead lists with table UI

[Rishavraaj]

Summary

• Leads page now shows a list of campaigns (lead lists) instead of a flat table
• Clicking a campaign opens all leads for that campaign
• Backend groups leads by campaign with counts

Changes

libs/sales

• leads.repository.ts: add findLists() — groups leads by campaignId using Prisma groupBy, joins campaign names, returns { campaignId, campaignName, leadCount }[]

apps/backend

• leads.service.ts: expose findLists()
• leads.controller.ts: add GET /leads/lists endpoint (declared before GET /leads/:id to avoid route conflict)

apps/web

• lib/api/leads.ts: add LeadList type and leadsApi.lists()
• query-options.ts: add getLeadLists() and getLeads(filters) query options
• app/(app)/leads/page.tsx: replaced flat list with LeadLists (server-side prefetch)
• app/(app)/leads/campaign/[campaignId]/page.tsx: new page — shows leads for a campaign
• components/Leads/LeadLists.tsx: table of campaigns with lead counts, click to drill in
• components/Leads/LeadsInList.tsx: table of leads for a campaign — name, email, company, title, status, created + convert/delete actions

Test plan

• /leads shows a table of campaigns with lead counts
• Clicking a row navigates to /leads/campaign/<id>
• Campaign leads page shows correct leads for that campaign
• Convert to Deal action works
• Delete action removes lead and refreshes list
• Empty states display correctly

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