Change sentiment heatmap from stacked bar to multi-line chart

Move export button to sidebar above Danger Zone in both files

Fix misleading filter status message - clarify full scan vs cap

Replace broken PDF with html2canvas screenshot export on Stats page

Remove confidence trend chart and word cloud from Stats view

Move engagement score section: after cumulative topic, before window snapshot

Move pinned messages from Stats to Comments view - show above feed

Smart filter: scan full history for last N matching messages + keyword accuracy fixes

Fix duplicate widget key - pages now import from shared.py not app.py

Refactor to multi-page navigation - fix view bleeding permanently