feat: map shapes, image persistence, grab tool, layer rename/delete, i18n, page metadata

supabase/migrations/034_layout_triple.sql

@@ -0,0 +1,5 @@
+-- Add 'triple' to layout_preset enum for 3-column layout
+ALTER TYPE layout_preset ADD VALUE IF NOT EXISTS 'triple';
+
+-- Migrate any existing 'focus_sidebar' or 'custom' layouts to 'split'
+UPDATE department_dashboards SET layout = 'split' WHERE layout IN ('focus_sidebar', 'custom');