Feature request: Library search + in-book full-text search

[mojoshaman8]

Two search features that would help a lot with larger libraries:

Library/folder search - search by title or filename across the file browser instead of scrolling alphabetically. With hundreds of books split across author/genre folders, finding a title gets difficult.

In-book full-text search - search for a word or phrase within the open EPUB, like KOReader's "Fulltext Search," and jump to matches.

Guessing #2 is much harder given the ESP32-C3's RAM limits (likely needs an on-disk index rather than in-memory scan), while #1 should be lighter since it's just matching filenames already in the directory listing.
Wishlist item, not an expectation. Happy to help test either one.