feat: converter accepts the constructs of goodluke and SaintlyCorruption

`init -490 screen`, `import x as y` and `from m import A as B`, classes with @renpy.pure, pickle hooks
on classes, `*` items in tuples and lists, generator functions (yield statements; the player runs them
to the end), multi-line expressions that need brackets, Null() and Animation() images, images given as
expressions (`"path/{}.png".format(x)`, f-strings), window statements in init, `offset` in ATL, input
widgets with their values and the focus/confirm actions, `continue` and `break` in screens, `drag`
and DiamondBox-style `fixed` with cell_size, `getattr(...)()` calls, transforms called with arguments,
and the whitelist for the new runtime. JSON files of a game are shipped as data files. Also fixes
blocking_names failing on a call of a call during full conversion.

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

backend/tests/test_screens.py

@@ -246,3 +246,16 @@ def test_dynamic_at_value_and_draggable_box():
     body = data.screens["s"]["body"]
     assert body[0]["props"]["at"][0]["dyn"]["k"] == "sub"
     assert body[1]["w"] == "drag" and "draggable" in body[1]["props"]
+
+
+def test_input_widget_values_and_focus_actions_are_accepted():
+    data = parse('screen s():\n    default name_value = VariableInputValue("name")\n    input:\n        id "player_name_input"\n'
+                 '        value name_value\n        length 12\n    input:\n        default "Bob"\n        allow "ab"\n'
+                 '    textbutton "x" action [name_value.Toggle(), Confirm("sure?", yes=NullAction()), CaptureFocus("tip")]\n'
+                 '    for i in [1, 2]:\n        if i == 1:\n            continue\n        text "[i]"\n'
+                 'label start:\n    call screen s\n')
+    audit_ir(data)
+    require_supported_scripts(data)
+    body = data.screens["s"]["body"]
+    assert [n.get("w") for n in body[:3]] == ["input", "input", "textbutton"]
+    assert "default" in body[1]["props"] and "value" in body[0]["props"]