Build AgentMinder Campaign Command Center - Phase 1 complete

Full-featured sales campaign dashboard replacing Looker Studio with
responsive Next.js app. Includes Executive Overview, Account Explorer
with priority algorithm, Activities with detail overlay, Pipeline/Opps
with deal panels, Implementation tracking, and Data Admin with CSV
import and CRUD operations.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitignore

@@ -33,6 +33,12 @@ yarn-error.log*
 # env files (can opt-in for committing if needed)
 .env*
 
+# database
+/data/
+
+# source data files
+*.xlsx
+
 # vercel
 .vercel