Improve user experience with battleship feedback and auto-play TTS

- Fix battleship feedback perspective confusion with better Hermes prompting
- Add auto-play TTS button with localStorage persistence and queueing system
- Move activity controls below model/voice selectors in sidebar
- Add activity controls to mobile hamburger menu
- Fix model/activity dropdowns to stay within container bounds
- Filter activities API to only show .yaml/.yml files
- Clean up system message labels by moving to usernames (System (Feedback), System (Question))
- Apply black formatting to app.py

Makefile

@@ -201,6 +201,19 @@ clean:
 	find . -name "*.pyc" -delete 2>/dev/null || true
 	find . -name "*.pyo" -delete 2>/dev/null || true
 	find . -name "*~" -delete 2>/dev/null || true
+
+.PHONY: init-db
+init-db:
+	@echo "🗄️ Initializing database tables..."
+	@if [ -f vars.sh ]; then \
+		. ./vars.sh && python init_db.py; \
+		echo "✅ Database tables created successfully"; \
+	else \
+		echo "❌ Error: vars.sh not found. Please create it from vars.sh.sample"; \
+		exit 1; \
+	fi
+
+clean-cache:
 	rm -rf .pytest_cache/ 2>/dev/null || true
 	rm -rf htmlcov/ 2>/dev/null || true
 	rm -rf .coverage 2>/dev/null || true