feat: Ren'Py screens (screen/call screen/show screen) with actions and styles

Converter
- screens.py parses the screen language: containers (fixed, frame, vbox, hbox,
  grid, vpgrid, viewport, button, has), widgets (text, textbutton, imagebutton,
  add, bar ...), if/for/use/transclude, default, python, key, timer, on, inline ATL,
  conditional properties, and decompiled forms (unparenthesised operators,
  glued property values, comma separated actions)
- style statements, call/show/hide screen operators and Python-level
  renpy.show_screen are translated; only screens the game shows are audited,
  unused stock screens no longer block an import; undefined screens do
- ATL values may be computed at run time and transforms take parameters
  (at blink(0.2, 0.3)); blur property

Player
- screens.ts builds the DOM from the IR and rebuilds it on state changes;
  buttons with idle/hover/selected/insensitive states, tooltips, sounds, modal
  screens, timers and keys that survive re-rendering, saved with the save file
- Actions: Jump, Call, Return, SetVariable, Toggle*, SetScreenVariable, Show, Hide,
  ToggleScreen, Function, Play, Notify, If, Language, ShowMenu, OpenURL ...
- Crop/LiveCrop/Solid/Frame/Transform/DynamicDisplayable values, crop property,
  globals(), renpy.variant/change_language/seen_image, transition stubs

Tests: screen parser and runtime (linkedom DOM), screens fixture compiled from
tests/fixtures/screens.rpy. Docs: docs/SCREENS.md.

Twisted-Thoughts now passes the strict compatibility check.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

docs/ARCHITECTURE.md

@@ -145,8 +145,8 @@ LOCKED`), Redis не нужен.
 
 Планы:
 
-* поддержка `screen`-языка и ATL `function`/`matrixcolor`/шейдеров (базовый ATL
-  с движением уже есть: `backend/app/converter/atl.py`, `frontend/src/player/atl.ts`);
+* ATL `function`, `matrixcolor`, шейдеры и `im.*` (экраны и ATL с движением уже есть:
+  [SCREENS.md](SCREENS.md), `backend/app/converter/atl.py`, `frontend/src/player/atl.ts`);
 * другие движки (TyranoBuilder, RPG Maker MV) через тот же IR;
 * дальнейшее дробление `engine.ts` на модули (рендер сцены, UI, сохранения);
 * типизация backend под `mypy` (сейчас проверка справочная).