lib.rs and menus.rs were split (#2491): the dialog_state accessors, the undimmed canvas while a
dialog previews, and Escape-as-Cancel for the Gradient Editor and Preview move to app/window.rs,
app/frame.rs and menus/shortcuts.rs. Layer Styles' rollback keeps main's text-editor handling inside
the shared restore(). The dialog preview integration test joins the tests/it binary.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RDvxCS8xcR28VArjzn1x7U
* Dev profile: line tables only for workspace crates, no debug info for dependencies
* xtask ci: dev-profile gate, nextest, tests without examples, wasm --keep-going
* One integration-test binary per crate
* xtask ci: run effectcraft-gpu's shared-device tests in one cargo test process
* xtask ci: run every stage and report all failures
* xtask ci: name the stage type (clippy type_complexity)
* xtask ci: run every test pass and report all failures
* cargo fmt