Add user email lookup component for sharing UI tooltips

logs/SESSION_LOG.txt

@@ -3,6 +3,30 @@ PRISM NOTES - SESSION LOG
 Project history, decisions, and architectural milestones
 ================================================================================
 
+[2026-01-14 16:00] MONICA SESSION: User Email Lookup Feature - New Standalone Component
+- Feature Request: Add hover tooltips showing email addresses when hovering over names in sharing UI
+- Architecture Decision: Created as standalone component in /tools/user-email-lookup/
+  Reasoning: Self-contained, reusable utility with single responsibility (email lookup)
+- Implementation:
+  * Created /tools/user-email-lookup/index.js (window.setupUserEmailLookup API)
+  * Created /tools/user-email-lookup/README.md (complete documentation)
+  * Integrated into index.html noteForm and conversationForm
+  * Uses existing Associations collection for first_name → email lookups
+  * Implements email caching to minimize PocketBase queries
+  * Uses MutationObserver for dynamic capsule detection
+  * Shows email in native browser tooltip on hover
+- Features:
+  * On note creation, user types names (e.g., "John, Sarah, Mike")
+  * Each name creates a capsule in selectedUsersContainer
+  * Hovering over capsule shows email (first hover queries DB, subsequent cached)
+  * Cache persists for page session, can be cleared via window.clearEmailLookupCache()
+- Integration Points:
+  * Script loaded: <script src="tools/user-email-lookup/index.js"></script>
+  * Initialized: showNoteForm() and showConversationForm()
+  * Container: #selectedUsersContainer (for both notes and conversations)
+- Status: Implemented and ready for testing
+- Next: Test with real Associations data and refine if needed
+
 [2026-01-14 15:45] MONICA SESSION: Standards Alignment Fixes
 - Action: Addressed audit findings - minor alignment issues
 - Fixes Applied: