Merge fixes and new dev tools

Makefile

@@ -0,0 +1,34 @@
+.PHONY: build up down logs clean
+
+# Build the plug using a Docker container with Deno
+build:
+	docker run --rm -v $(PWD):/app -w /app denoland/deno:latest task build
+
+# Start the SilverBullet test container
+up:
+	mkdir -p test_space
+	docker compose up -d
+
+# Stop the SilverBullet test container
+down:
+	docker compose down
+
+# View logs from the SilverBullet container
+logs:
+	docker compose logs -f
+
+# Watch for changes and rebuild automatically using Deno's internal watch
+watch:
+	@echo "Starting watch in background..."
+	docker run -d --name ical-watch -v $(PWD):/app -w /app denoland/deno:latest task watch
+	@echo "Watching... Use 'docker logs -f ical-watch' to see build progress."
+
+# Stop the watch container
+stop-watch:
+	docker rm -f ical-watch
+
+# Clean up build artifacts and test space
+clean:
+	rm -f *.plug.js
+	# Be careful with test_space if you have notes there you want to keep
+	# rm -rf test_space

docker-compose.yml

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+services:
+  silverbullet:
+    image: zefhemel/silverbullet:latest
+    ports:
+      - "3000:3000"
+    volumes:
+      - ./test_space:/space
+      - ./icalendar.plug.js:/space/_plug/icalendar.plug.js:ro
+    environment:
+      - SB_USER=admin:admin # Default for easy local testing