[Bug] Search doesn't match line-wrapped strings

[playwmadness]

Probably related to #40

[benjajaja]

We know do have something conceptually similar for links: multiple spans can share the same URL as an Arc<str> with the same underlying .as_ptr() id. I wonder if we could leverage something like that for all wrapped words. It all sounds quite complicated, but also doable.

[dev-nicolaos]

I'm not sure if this is the same issue or not, but it also would appear that search doesn't match strings in headings. This is not due to the headings being rendered as images as I tested in Kitty and verified text is being used because I can highlight and copy just fine.