* refactor(engine): split convert_all's per-story plan into convert_plan
Resolves SonarCloud rust:S3776 on convert_all (cmd/variables.rs).
* refactor(pdf): split graphic_unclipped into per-kind helpers
Resolves SonarCloud rust:S3776 on graphic_unclipped (pdf/src/export.rs).
* refactor(compose): extract wrap exclusions and frame text area from frame_specs_placed
Resolves SonarCloud rust:S3776 on frame_specs_placed (compose/src/lib.rs).
* refactor(ui): extract command shortcut lookup from shortcut_key
Resolves SonarCloud rust:S3776 on shortcut_key (ui-egui/src/menus.rs).