Fixes highlighting using wrong validation data

[Tokessa]

This PR fixes an issue where highlighting for:

• missing feedback in the control structure
• missing references in the control structure and relationship graph

was based on the previously validated .stpa file instead of the currently active one.

[Copilot]

Pull request overview

This PR aims to make STPA highlighting use validation data from the currently active document instead of whichever .stpa file was validated last. It does that by threading document URIs through validation state and diagram generation so missing-reference and missing-feedback highlights can be resolved per file.

Changes:

• Replaced global validator state for missing references/feedback with URI-keyed caches.
• Captured the active document URI during validation and diagram generation.
• Updated diagram creation to read missing-reference and missing-feedback data from the URI-specific validator entries.

Reviewed changes

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

File	Description
extension/src-language-server/stpa/services/stpa-validator.ts	Stores missing-reference and missing-feedback validation results per document URI instead of globally.
extension/src-language-server/stpa/diagram/diagram-generator.ts	Passes the active document URI into graph generation and reads URI-scoped validation data for highlighting.

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