M6: calculation checks: an Acrobat widget name is a missing field, as nothing here resolves it

found accepted price.0 (up to the field's last widget), but links,
recalculate and the scripts' getField all take a name as the field or
the fields under it, so a formula reading price.0 got no value and no
order check while the page said nothing was wrong. found now looks
names up the same way; a widget name is flagged as missing until all of
them resolve it (from CodeRabbit's review).

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

parity/acrobat-features.toml

@@ -4679,7 +4679,7 @@ milestone = "M6"
 status = "shipped"
 commands = ["form.field.properties", "form.calculation_order"]
 tools = ["form_set_props", "form_fill", "form_calculation_order"]
-evidence = ["crates/forms/src/tests.rs::formats_validation_and_calculations_run_like_acrobat", "crates/forms/src/tests.rs::the_calculation_order_is_checked_fixed_and_kept", "crates/forms/src/tests.rs::a_calculation_order_with_gaps_and_extra_entries", "crates/forms/src/tests.rs::two_fields_with_one_name_keep_their_places_in_the_order", "crates/engine/src/tests.rs::setting_the_calculation_order_recalculates_and_undoes", "crates/automation/tests/it/automation.rs::the_calculation_order_is_read_fixed_and_set", "crates/ui-egui/tests/it/prepare.rs::the_calculation_order_is_moved_dragged_and_fixed", "crates/engine/src/tests.rs::checkbox_and_rank_changes_recalculate_ordered_dependents", "crates/engine/src/tests.rs::dynamic_calculation_reads_and_side_effects_reach_later_fields", "crates/forms/src/tests.rs::missing_fields_and_built_names_are_flagged", "crates/forms/src/calc_order.rs::a_read_name_finds_a_field_a_group_or_a_widget", "crates/forms/src/af/tests.rs::names_built_at_run_time_are_noticed", "crates/automation/tests/it/automation.rs::the_calculation_order_shows_formulas_and_what_they_cannot_read", "crates/ui-egui/tests/it/prepare.rs::a_formula_reading_a_missing_field_has_its_own_card"]
+evidence = ["crates/forms/src/tests.rs::formats_validation_and_calculations_run_like_acrobat", "crates/forms/src/tests.rs::the_calculation_order_is_checked_fixed_and_kept", "crates/forms/src/tests.rs::a_calculation_order_with_gaps_and_extra_entries", "crates/forms/src/tests.rs::two_fields_with_one_name_keep_their_places_in_the_order", "crates/engine/src/tests.rs::setting_the_calculation_order_recalculates_and_undoes", "crates/automation/tests/it/automation.rs::the_calculation_order_is_read_fixed_and_set", "crates/ui-egui/tests/it/prepare.rs::the_calculation_order_is_moved_dragged_and_fixed", "crates/engine/src/tests.rs::checkbox_and_rank_changes_recalculate_ordered_dependents", "crates/engine/src/tests.rs::dynamic_calculation_reads_and_side_effects_reach_later_fields", "crates/forms/src/tests.rs::missing_fields_and_built_names_are_flagged", "crates/forms/src/calc_order.rs::a_read_name_finds_a_field_or_a_group", "crates/forms/src/af/tests.rs::names_built_at_run_time_are_noticed", "crates/automation/tests/it/automation.rs::the_calculation_order_shows_formulas_and_what_they_cannot_read", "crates/ui-egui/tests/it/prepare.rs::a_formula_reading_a_missing_field_has_its_own_card"]
 notes = "/CO order, then other calculated fields; recalculated after every fill and Clear form. Order editing: Prepare a form ▸ Calculation order lists the calculated fields in order with their formulas and values, Up/Down arrows (as Acrobat's Set Field Calculation Order dialog), Alt+Up/Down and drag, says which fields read a field calculated later, which read each other in a loop and which /CO leaves out, and Fix order moves only what must move; on the page it numbers each calculated field's step and draws arrows from the fields the focused field reads and to the fields that read it; form_calculation_order reads, sets, moves and fixes it. Each formula is also checked against the form: a read of a field the form doesn't have (a field deleted from under a sum, a typo in notation, a script's getField) and a script that builds the names it reads at run time are flagged, in form_calculation_order (which also gives each formula) and on the page: a red Missing field mark on the row and a card naming those formulas with a link to edit the first (no all-clear while one is broken), a grey note for built names, and both in the summary above the page. A new calculation joins the end of /CO and an edited one keeps its place. Acrobat's dialog is known from Adobe's help summary only, not yet observed."
 
 [[feature]]