101 render the document outline with collapsible folders per tree

[odungern]

• TTL Export improved
• Document display referencing an outline with collapsible folders.
• Some refactoring

[Copilot]

Pull request overview

This PR updates the document viewing UX to render a hierarchical outline (with collapsible folders) derived from cas:Root / cas:lists links, while also refactoring import/export behavior and updating fixture data to reflect the revised CASCaRA/TTL/JSON-LD semantics.

Changes:

• Replace the flat document list with a recursive outline tree (OutlineTreeItem) and add an “Unreferenced Items (Recycle Bin)” section for orphaned entities.
• Align importer responses/status handling (notably 603) and simplify import/export component styling by moving repeated scoped CSS into global styles.
• Improve TTL enumeration export (datatype + owl:anyOf + individuals) and update XML/TTL/JSON-LD test fixtures accordingly.

Reviewed changes

Copilot reviewed 42 out of 55 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tests/unit/import-xml.spec.ts	Renames test descriptions for updated naming/terminology.
tests/unit/import-fmi.spec.ts	Adjusts diagnostic logging behavior in FMI import tests.
tests/data/XML/21/Very Simple Model (FMC) with Requirements.cas.xml.new	Adds new XML fixture variant reflecting updated outline/hierarchy structure.
tests/data/XML/21/Very Simple Model (FMC) with Requirements.cas.xml	Updates title, enumerated link metadata, and outline/root structure.
tests/data/XML/11/Alice_works_for_ACME.cas.xml	Updates outline listing structure in fixture data.
tests/data/XML/05/Requirement_with_Enumerated_Property.cas.xml	Updates titles and enumerated link metadata in fixture data.
tests/data/TTL/21/Very_Simple_Model_(FMC)_with_Requirements.cas.ttl	Updates TTL output fixture for enumeration/export and outline structure.
tests/data/TTL/11/Alice_works_for_ACME.with-itemTypes.cas.ttl	Updates TTL fixture metadata/versioning and prefixes.
tests/data/TTL/11/Alice_works_for_ACME.cas.ttl	Updates TTL fixture metadata/versioning and prefixes.
tests/data/TTL/05/Requirement_with_Enumerated_Property.cas.ttl	Updates TTL fixture for enumeration/export and labeling.
tests/data/JSON-LD/21/Very_Simple_Model_(FMC)_with_Requirements.cas.jsonld	Updates JSON-LD fixture for enumerated target link and hierarchy structure.
tests/data/JSON-LD/05/Requirement_with_Enumerated_Property.cas.jsonld	Updates JSON-LD fixture for enumerated target link and labeling.
src/styles/main.css	Centralizes shared component styling (cards/alerts/margins, dl layout).
src/plugins/import/xml/mount-import-xml.ts	Refactors XML import plugin options typing and header comments.
src/plugins/import/xml/mount-import-any-xml.ts	Adds an “any XML” import plugin registration (SEF-backed import UI).
src/plugins/import/xml/import-xml.vue.new	Updates partial-success status handling in the newer XML import implementation.
src/plugins/import/xml/import-xml.vue	Restricts accepted extensions to .cas.xml, removes SEF option, and updates partial-success status comment.
src/plugins/import/xml/import-any-xml.vue	Introduces UI flow for importing arbitrary XML with required SEF transformation.
src/plugins/import/reqif/import-reqif.vue	Removes duplicated scoped styling (now in global CSS).
src/plugins/import/jsonld/import-jsonld.vue	Restricts accepted extensions to .cas.jsonld, updates partial-success status comment, removes duplicated scoped styling.
src/plugins/import/fmi/import-fmi.vue	Removes duplicated scoped styling (now in global CSS).
src/plugins/export/ttl/export-ttl.vue	Clarifies platform-independent write comment; removes duplicated scoped styling.
src/plugins/export/jsonld/export-jsonld.vue	Clarifies platform-independent write comment; removes duplicated scoped styling.
src/components/PageDocument.vue	Builds an outline tree from graph entities/links and renders it via a recursive component.
src/components/OutlineTreeItem.vue	Adds a recursive outline tree item with collapsible folders.
src/common/schema/pig/ts/pig-package-constraints.ts	Refactors constraint checking (naming, maps) and enumerated property/link handling.
src/common/schema/pig/ts/pig-metaclasses.ts	Updates metaclass documentation and refactors instantiation eligibility; adjusts XML link parsing to support multiple <idRef>.
src/common/schema/pig/json/pig-schemata.ts	Documentation/header tweak (author label).
src/common/lib/messages.ts	Retires/blocks old 604 messaging and standardizes on 603 for partial success.
src/common/import/xml/import-xml.ts	Returns APackage.status() + items directly and updates instantiation eligibility check.
src/common/import/reqif/import-reqif.ts	Returns APackage.status() + items directly; adds a write-to-file step (currently unconditional).
src/common/import/jsonld/import-jsonld.ts	Changes partial-success status from 604 to 603 with updated message context.
src/common/import/fmi/import-fmi.ts	Returns APackage.status() + items directly; keeps optional debug write commented.
src/common/export/ttl/getTTL.ts	Enhances enumeration export with datatype + owl:anyOf list and value individuals.
src/build-info.ts	Updates generated build metadata (version/time/commit).
public/assets/xslt/SysML-v1-RDF.xsl.orig	Removes an unused/original XSLT asset.
public/assets/xslt/STEP-p28-RDF.xsl.orig	Removes an unused/original XSLT asset.
public/assets/styles/about.css	Adds basic table styling for documentation pages.
public/assets/index.html	Replaces transformation list with an HTML table linking XSL/SEF artifacts.
package.json	Bumps package version to 0.2.10.
package-lock.json	Updates lockfile version metadata to 0.2.10.
components.d.ts	Registers OutlineTreeItem as a global component type.

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