chapter editor

[szeamer]

I wrote this to ease splitting chapters for Faerie. Since it uses the standard temp_db structure, it could be used to cleanup other archives as well.
This PR adds chapter_editor.py, a Tkinter GUI script that reads a chapter from the output database and allows the operator to perform either operation interactively.
Split — operator clicks in the rendered text to set a split point. The original chapter is updated with the text before that point (title renamed to [Title] Part 1), a new chapter is inserted immediately after it (title [Title] Part 2), and all subsequent chapters in the story have their position incremented.
Trim — operator selects a range of text. The chapter is updated to contain only that selection. No chapters are added or reordered.
Chapter text is displayed with HTML stripped and block-level tags converted to newlines for readability. The split/trim operates on the raw HTML stored in the database. Both operations are atomic and roll back on error.
Usage:
python chapter_editor.py -p <archive>.yml --chapter_id <id>
Requires Python compiled with Tcl/Tk support (python -m tkinter to verify).

[hlieberman]

Hello! Very interesting; a tool I definitely could have used a couple of times myself. Could you add tkinter to the dependencies in requirements.txt, and make the tree ruff check and ruff format clean?

Edit: derp, tkinter is a built-in.

[hlieberman]

No need to mention pymysql or pyyaml; those are both required for any of this stuff to have a hope of running (and are in requirements.txt).