Allow implicit node selections?

Currently we show "node tools" only when a single node in a container is selected. For instance when we have story.buttons you need to select the full button in order to see the URL tool.

However, we might want to show the URL tool also when your selection is inside button.label. So the button is implicitly selected.

Pro:

• this will make the href (URL) field of buttons more discoverable

Con:

• this might be a generalization that will not work for other situations
• it creates some ambiguity (button href field shows up in two situations - is that intuitive?)

Thoughts:

• collect more use cases like this and experiment
• everything is possible already by inspecting the current doc state + selection state: but we may want to distill patterns and distill them to utilities (something like ProseMirror's commands, but i'm actually not sure if its a good idea, Svelte's $derived does a good job without introducing a new abstraction.

Start by collecting the proposed use cases and inspecting the current document state and selection state behavior. Experiment with implicit node selections, then determine whether a reusable pattern is justified and what consistent behavior should count as done.