Text opacity isn't considered in component classes if color is inherited

[rodrigogiraoserrao]

As a follow-up to #3415, there are edge cases that aren't handled yet.
When TCSS sets text opacity for a component class associated with the toggle button or the tree and that TCSS doesn't set color, text opacity isn't accounted for:

from textual.app import App, ComposeResult
from textual.widgets import Checkbox


class ComponentClassesOpacity(App[None]):
    CSS = """
    Widget {
        color: white;
    }
    Checkbox > .toggle--label {
        text-opacity: 0%;
    }
    """

    def compose(self) -> ComposeResult:
        yield Checkbox("this should be invisible")


if __name__ == "__main__":
    ComponentClassesOpacity(watch_css=True).run()

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