Emdash source with visual editor image upload fix

Fixes:
1. media.ts: wrap placeholder generation in try-catch
2. toolbar.ts: check r.ok, display error message in popover

templates/marketing/.gitignore

@@ -0,0 +1,34 @@
+# Dependencies
+node_modules/
+
+# Build output
+dist/
+
+# Astro
+.astro/
+
+# Data
+data.db
+data.db-shm
+data.db-wal
+uploads/
+
+# Environment
+.env
+.env.*
+!.env.example
+
+# IDE
+.vscode/*
+!.vscode/mcp.json
+.idea/
+*.swp
+*.swo
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Logs
+*.log
+npm-debug.log*