Improve Makefile for reproducible builds

- Add build-all target for full clean rebuild
- Use file-based dependencies for proper incremental builds
- terminal.js depends on terminal.ts and node_modules
- ghostty-vt.wasm depends on node_modules
- Add build alias for bundle
- Add clean-all to remove everything
- Improve help text with organized sections
- Fix __pycache__ cleanup pattern

Makefile

@@ -1,11 +1,45 @@
-.PHONY: help install install-dev lint format test coverage check clean bundle bundle-watch bundle-clean
+.PHONY: help install install-dev lint format test coverage check clean clean-all build build-all bundle bundle-watch bundle-clean
 
 PYTHON ?= python3
 PIP ?= $(PYTHON) -m pip
 
+# Static assets
+STATIC_JS_DIR = src/textual_webterm/static/js
+TERMINAL_JS = $(STATIC_JS_DIR)/terminal.js
+TERMINAL_TS = $(STATIC_JS_DIR)/terminal.ts
+GHOSTTY_WASM = $(STATIC_JS_DIR)/ghostty-vt.wasm
+
 help:
-	@echo "Targets: install install-dev lint format test coverage check clean"
-	@echo "Frontend: bundle bundle-watch bundle-clean"
+	@echo "Build targets:"
+	@echo "  build-all    - Full reproducible build (clean + deps + bundle + install)"
+	@echo "  build        - Build frontend only (bundle)"
+	@echo "  bundle       - Build terminal.js and copy WASM"
+	@echo "  bundle-watch - Watch mode for development"
+	@echo ""
+	@echo "Python targets:"
+	@echo "  install      - Install package in editable mode"
+	@echo "  install-dev  - Install with dev dependencies"
+	@echo "  lint         - Run ruff linter"
+	@echo "  format       - Format code with ruff"
+	@echo "  test         - Run pytest"
+	@echo "  coverage     - Run pytest with coverage"
+	@echo "  check        - Run lint + coverage"
+	@echo ""
+	@echo "Clean targets:"
+	@echo "  clean        - Remove Python cache files"
+	@echo "  bundle-clean - Remove frontend build artifacts"
+	@echo "  clean-all    - Remove everything (clean + bundle-clean)"
+
+# =============================================================================
+# Full reproducible build
+# =============================================================================
+
+build-all: clean-all node_modules bundle install-dev check
+	@echo "Build complete!"
+
+# =============================================================================
+# Python targets
+# =============================================================================
 
 install:
 	$(PIP) install -e .
@@ -28,19 +62,41 @@ coverage:
 
 check: lint coverage
 
-clean:
-	rm -rf .pytest_cache .coverage htmlcov .ruff_cache
-
+# =============================================================================
 # Frontend build targets (requires Bun: https://bun.sh)
+# =============================================================================
+
+# Install node dependencies (creates bun.lock if missing)
 node_modules: package.json
 	bun install
+	@touch node_modules
 
-bundle: node_modules
-	bun run build
+# Build terminal.js from TypeScript
+$(TERMINAL_JS): $(TERMINAL_TS) node_modules
+	bun build $(TERMINAL_TS) --outfile=$(TERMINAL_JS) --minify --target=browser
 
-bundle-watch: node_modules
-	bun run copy-wasm
-	bun run watch
+# Copy WASM file from node_modules
+$(GHOSTTY_WASM): node_modules
+	cp node_modules/ghostty-web/ghostty-vt.wasm $(GHOSTTY_WASM)
+
+# Main bundle target - builds JS and copies WASM
+bundle: $(TERMINAL_JS) $(GHOSTTY_WASM)
+
+# Alias for bundle
+build: bundle
+
+# Watch mode for development
+bundle-watch: $(GHOSTTY_WASM)
+	bun build $(TERMINAL_TS) --outfile=$(TERMINAL_JS) --watch --target=browser
+
+# =============================================================================
+# Clean targets
+# =============================================================================
+
+clean:
+	rm -rf .pytest_cache .coverage htmlcov .ruff_cache __pycache__ src/**/__pycache__
 
 bundle-clean:
-	rm -rf node_modules bun.lock src/textual_webterm/static/js/terminal.js src/textual_webterm/static/js/ghostty-vt.wasm
+	rm -rf node_modules bun.lock $(TERMINAL_JS) $(GHOSTTY_WASM)
+
+clean-all: clean bundle-clean