Fix spacing call sites for collection cardinality

[HassanAkbar]

Metanorma PR checklist

• Breaking changes (list related PRs)
• Documentation update required (create task for this)
• External dependency introduced (documentation update need)
• Gem with native library introduced

Related to lutaml/lutaml-model#720
Fixes spec failurs in https://github.com/lutaml/lutaml-model/actions/runs/30433439998/job/90521685449?pr=720

[Copilot]

Pull request overview

This PR updates Uniword’s handling of paragraph spacing to support Word’s behavior of emitting multiple w:spacing elements within a single w:pPr, and updates affected call sites and specs accordingly (related to lutaml-model collection/cardinality behavior).

Changes:

• Change Wordprocessingml::ParagraphProperties#spacing to a collection and add #ensure_spacing for safe mutation of the “first” spacing entry.
• Update builder APIs and multiple specs to treat spacing as an array/collection.
• Add/extend round-trip tests to ensure repeated w:spacing entries are preserved and that Style#spacing_before/after can find values across entries.

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
spec/uniword/wordprocessingml/styleset_roundtrip_spec.rb	Adjust spacing assertions for collection semantics; add private-fixture coverage for repeated w:spacing.
spec/uniword/wordprocessingml/styleset_integration_spec.rb	Update spacing access for collection (needs a robustness tweak per stored comment).
spec/uniword/wordprocessingml/style_roundtrip_spec.rb	Add fixture-free inline XML coverage for repeated w:spacing and spacing value lookup across entries.
spec/uniword/wordprocessingml/paragraph_enhanced_properties_spec.rb	Update spacing expectation to handle collection.
spec/uniword/wordprocessingml/line_spacing_spec.rb	Update spacing mutation/assertions to use ensure_spacing and collection access.
spec/uniword/properties/paragraph_properties_spec.rb	Add coverage for building/ensuring spacing entries and collection behavior.
spec/uniword/docx/reconciler_spec.rb	Update spacing access to tolerate collection.
spec/uniword/builder/style_builder_spec.rb	Update spacing expectations to use .first.
spec/uniword/builder/paragraph_builder_spec.rb	Update spacing expectations; add test ensuring spacing reuses the existing entry.
lib/uniword/wordprocessingml/style.rb	Update spacing_before/after to search across multiple spacing entries.
lib/uniword/wordprocessingml/paragraph_properties.rb	Make spacing a collection; add ensure_spacing; update flat-attribute conversion to build a single entry.
lib/uniword/builder/style_builder.rb	Update builder spacing setter to use ensure_spacing.
lib/uniword/builder/paragraph_builder.rb	Update builder spacing setter to use ensure_spacing.

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[Copilot]

Pull request overview

Copilot reviewed 13 out of 13 changed files in this pull request and generated no new comments.

[Copilot]

Pull request overview

Copilot reviewed 13 out of 13 changed files in this pull request and generated no new comments.