Always poetry run commands that need a venv

It's a `Makefile` so it's handy to not have to think about if you need to be
within a poetry venv when running `make`. This commit adds a `poetry run`
before any command that needs the venv. This means that people who aren't in
a venv can just `make something` and it'll "just work", and the same is true
for those who are in a venv.

Makefile

@@ -1,26 +1,28 @@
+run := poetry run
+
 .PHONY: test
 test:
-	pytest --cov-report term-missing --cov=textual tests/ -vv
+	$(run) pytest --cov-report term-missing --cov=textual tests/ -vv
 
 .PHONY: unit-test
 unit-test:
-	pytest --cov-report term-missing --cov=textual tests/ -vv -m "not integration_test"
+	$(run) pytest --cov-report term-missing --cov=textual tests/ -vv -m "not integration_test"
 
 .PHONY: test-snapshot-update
 test-snapshot-update:
-	pytest --cov-report term-missing --cov=textual tests/ -vv --snapshot-update
+	$(run) pytest --cov-report term-missing --cov=textual tests/ -vv --snapshot-update
 
 .PHONY: typecheck
 typecheck:
-	mypy src/textual
+	$(run) mypy src/textual
 
 .PHONY: format
 format:
-	black src
+	$(run) black src
 
 .PHONY: format-check
 format-check:
-	black --check src
+	$(run) black --check src
 
 .PHONY: clean-screenshot-cache
 clean-screenshot-cache:
@@ -28,15 +30,15 @@ clean-screenshot-cache:
 
 .PHONY: docs-serve
 docs-serve: clean-screenshot-cache
-	mkdocs serve --config-file mkdocs-online.yml
+	$(run) mkdocs serve --config-file mkdocs-online.yml
 
 .PHONY: docs-build
 docs-build:
-	mkdocs build --config-file mkdocs-online.yml
+	$(run) mkdocs build --config-file mkdocs-online.yml
 
 .PHONY: docs-build-offline
 docs-build-offline:
-	mkdocs build --config-file mkdocs-offline.yml
+	$(run) mkdocs build --config-file mkdocs-offline.yml
 
 .PHONY: clean-offline-docs
 clean-offline-docs:
@@ -44,7 +46,7 @@ clean-offline-docs:
 
 .PHONY: docs-deploy
 docs-deploy: clean-screenshot-cache
-	mkdocs gh-deploy
+	$(run) mkdocs gh-deploy
 
 .PHONY: build
 build: docs-build-offline