typehints + better autosave behaviour. previous release sadly got ove…

…rwritten by an accidental push workflow dispatch on dev-pr branch

Bugfixes / usability

* Highlighting performance improvement by using extra selections
  instead of charformats.
* Add unicode characters needed to type the sample books to default
  reps dict.
* Better placement of figure elements (no longer stretch lines).

* typespeed game

* learn stenography game
* icon fallbacks fix
* better-looking dark theme
* populate themes/iconsets/wordlists: better handling when there are
  duplicates in user dir

* Customisation dialog sidebar

* Shelf View book idn positioning
* Customisation dialog RDict/SDict readability
* User dir checks
* Icon sets

* fix(Windows): Only hide console if owned by retype

* fix(Logging): Silence third-party warnings when not on DEBUG level
* fix(UI): Modeline clipping

* fix hashlib errors in console on linux and mac

* fix unreadable about dialog tabs on nobara

themes

- auto_newline opposite bug again

- not autosave when idle

* SafeDict

* Use SafeDict in CustomisationDialog
* enter_newline → auto_newline