esphome: fix optional dependencies

Avoid runtime version mismatch errors such as:

> Please update your pillow installation to 10.2.0.
> (pip install "pillow==10.2.0").

pkgs/tools/misc/esphome/default.nix

@@ -41,6 +41,12 @@ python.pkgs.buildPythonApplication rec {
   postPatch = ''
     # drop coverage testing
     sed -i '/--cov/d' pytest.ini
+
+    # ensure component dependencies are available
+    cat requirements_optional.txt >> requirements.txt
+    # relax strict runtime version check
+    substituteInPlace esphome/components/font/__init__.py \
+      --replace-fail "10.2.0" "${python.pkgs.pillow.version}"
   '';
 
   # Remove esptool and platformio from requirements
@@ -55,6 +61,7 @@ python.pkgs.buildPythonApplication rec {
   propagatedBuildInputs = with python.pkgs; [
     aioesphomeapi
     argcomplete
+    cairosvg
     click
     colorama
     cryptography