bUnit tests for key pages/components

[unrealbg]

Summary

Key Blazor components/pages (PagedCategoryPosts, Post Details) lack bUnit tests for state rendering and navigation.

Scope

• Area(s): Application, Testing
• Non-goals: End-to-end browser automation

Plan

• Add bUnit tests for PagedCategoryPosts and Post Details
• Render and assert states (loading, empty, results)
• Test navigation and parameter changes
• Add minimal mocking for services

Acceptance criteria

• Render and assert states (loading, empty, results)
• Navigation and parameter changes tested
• Minimal mocking for services
• Build, tests, and formatting pass in CI

Additional context

Labels: test