bug(frontend): KBSearchResultPanel still creates duplicate KnowledgeRepository instance

[mrveiss]

Description

KBSearchResultPanel doesn't accept the repository prop passed from parent, and still creates its own instance. This defeats #3940's goal of eliminating duplicate repository creation.

Current state:

• KnowledgeSearch.vue creates: const knowledgeRepo = new KnowledgeRepository()
• KnowledgeSearch.vue passes: <KBSearchResultPanel :repository="knowledgeRepo" ... />
• KBSearchResultPanel ignores it: No repository prop defined
• KBSearchResultPanel creates its own: line 220 const knowledgeRepo = new KnowledgeRepository()
• KBSearchResultPanel uses its own: line 308 await knowledgeRepo.getDocument(document.id)

Result: Two KnowledgeRepository instances in memory (parent's + child's)

Fix required:

1. Add repository: KnowledgeRepository to KBSearchResultPanel props (line 199-203)
2. Replace local const knowledgeRepo = new KnowledgeRepository() with the prop
3. Update line 308 to use passed-in repository

Related: #3940, #3296

Type: bug
Priority: medium