fix: install project deps before running pre-commit so ty can resolve imports

Author: jeanscherf

.github/workflows/checks.yaml

@@ -32,5 +32,8 @@ jobs:
         with:
           python-version: ${{ env.PYTHON_VERSION }}
 
+      - name: "Install dependencies"
+        run: uv sync --all-extras
+
       - name: "Run pre-commit hooks"
         run: uvx pre-commit run --all-files