chore: add MVP planning backlog

backlog/tasks/task-4 - Build-the-dashboard-shell-and-lead-funnel.md

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+---
+id: TASK-4
+title: Build the dashboard shell and lead funnel
+status: To Do
+assignee: []
+created_date: '2026-06-03 19:12'
+labels:
+  - mvp
+  - ui
+  - dashboard
+dependencies:
+  - TASK-3
+references:
+  - PRD.md
+priority: high
+ordinal: 4000
+---
+
+## Description
+
+<!-- SECTION:DESCRIPTION:BEGIN -->
+Create the internal German-language dashboard shell for the MVP. It should provide navigation, Light/Dark mode for the dashboard only, a Kanban/Funnel lead overview, status badges, and entry points into campaign, audit, review, analytics, and settings areas.
+<!-- SECTION:DESCRIPTION:END -->
+
+## Acceptance Criteria
+<!-- AC:BEGIN -->
+- [ ] #1 Dashboard shell has German navigation for campaigns, leads, audits, analytics, blacklist, and settings
+- [ ] #2 Light/Dark theme toggle works only in the internal dashboard
+- [ ] #3 Kanban/Funnel columns represent the agreed lead states, including Kontakt fehlt, Audit bereit, Freigabe offen, Kontaktiert, Follow-up, and Zurückgestellt
+- [ ] #4 Lead cards show the key scan data: company, niche, location, priority, contact status, and next action
+- [ ] #5 Dashboard remains keyboard accessible and responsive on practical desktop/tablet widths
+<!-- AC:END -->
+
+## Implementation Plan
+
+<!-- SECTION:PLAN:BEGIN -->
+1. Define dashboard route layout, sidebar, header, and content slots.
+2. Add German navigation labels and status vocabulary.
+3. Implement theme provider and dashboard-only toggle.
+4. Build the Kanban/Funnel view using Convex lead data.
+5. Add empty states, loading states, and basic accessibility checks.
+<!-- SECTION:PLAN:END -->