Fix relative endpoint URL resolution when saving to SPARQL workspace

[Copilot]

Relative endpoints (e.g., /sparql) were being saved with a static http://server/ prefix instead of resolving against the current page's protocol and host. On https://example.com/yasgui/, an endpoint configured as /sparql would be saved as http://server/sparql rather than https://example.com/sparql.

Changes

• packages/yasgui/src/urlUtils.ts: Added resolveEndpointUrl() to convert relative/absolute paths to fully qualified URLs using window.location.protocol and window.location.host

• packages/yasgui/src/Tab.ts: Wrap endpoint with resolveEndpointUrl() when saving to SPARQL workspaces:

  associatedEndpoint: workspace.type === "sparql" ? resolveEndpointUrl(this.getEndpoint()) : undefined,

• test/unit/url-utils-test.ts: Unit tests covering protocol resolution, port preservation, and absolute/relative path handling

The fix only affects SPARQL workspace saves; Git workspaces are unchanged.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Wrong endpoint for saved query in SPARQL workspace</issue_title>
<issue_description>When the endpoint in Yasgui is configured relatively, for example "/sparql", the query is saved with the endpoint "http://server/sparql".

We need to get the full url path (including correct https schema) and save that instead of adding the static http://server/. </issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Wrong endpoint for saved query in SPARQL workspace #117

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[MathiasVDA]

Good works now properly!