Entity Footnotes patch v1.0.1

Fixes a bug where short entity aliases could match as a bare substring inside unrelated words (e.g. a character alias like "Han" underlining part of "than"). Boundary matching no longer relies on the search engine's \b support, which it turns out isn't reliably honored.

Also fixes entity names containing regex-special characters (periods, parentheses, etc.) not matching correctly due to an escaping bug.