Add control entities: box to-do list, skip switch, donate button, subscriptions

The to-do list exists so Home Assistant's own conversation agent can manage the
order through HassListAddItem rather than through anything bespoke. Skip is a
switch because skipped/not-skipped is state worth reading back; donate is a
button because it cannot be undone. Un-skip raises rather than guessing at an
endpoint that has never been observed.

Fixes subscription parsing, which matched the heading row and so reported zero
on an account that has one.

tests/test_translations.py

@@ -13,7 +13,12 @@ from pathlib import Path
 import pytest
 
 COMPONENT = Path(__file__).parent.parent / "custom_components" / "freshharvest"
-PLATFORMS = {"sensor": "sensor.py", "binary_sensor": "binary_sensor.py"}
+PLATFORMS = {
+    "sensor": "sensor.py",
+    "binary_sensor": "binary_sensor.py",
+    "switch": "switch.py",
+    "button": "button.py",
+}
 
 
 def declared_keys(filename: str) -> set[str]:
@@ -29,6 +34,22 @@ def declared_keys(filename: str) -> set[str]:
     }
 
 
+def attr_keys(filename: str) -> set[str]:
+    """Collect `_attr_translation_key = "..."` assignments (entities without a
+    description object declare their name this way)."""
+    tree = ast.parse((COMPONENT / filename).read_text(encoding="utf-8"))
+    return {
+        node.value.value
+        for node in ast.walk(tree)
+        if isinstance(node, ast.Assign)
+        and any(
+            getattr(t, "id", getattr(t, "attr", None)) == "_attr_translation_key"
+            for t in node.targets
+        )
+        and isinstance(node.value, ast.Constant)
+    }
+
+
 @pytest.fixture(name="strings")
 def strings_fixture() -> dict:
     return json.loads((COMPONENT / "strings.json").read_text(encoding="utf-8"))
@@ -64,3 +85,8 @@ def test_manifest_is_well_formed():
         assert manifest[key].startswith("https://github.com/"), (
             f"{key} must be a public URL, got {manifest[key]}"
         )
+
+
+def test_todo_entity_is_named(strings):
+    """todo.py declares its name via _attr_translation_key, not a description."""
+    assert attr_keys("todo.py") == set(strings["entity"]["todo"])