Tests: typed tag badges and tag filtering UI

[joestump]

Covers #347 (blocked by it). Companion frontend test story per SDD frontend-quality conventions.

Test Requirements

• Template render tests: TypedTagBadge renders spec-correct badge class + icon per tag type (genre/mood/ai/id3/user); TypedTagGroup groups by type with labels; show pages render typed tags for fixture entities
• HTMX integration tests: tag filter interactions return the filtered entity list fragment backed by entity_tags

Acceptance Criteria

• Badge-class assertions match SPEC unified-tag-taxonomy "UI Tag Visual Differentiation" exactly
• Estimated at no more than half the effort of Wire entity_tags read path and adopt TypedTagBadge UI #347

Branch

feature/348-tests-typed-tag-ui

PR Convention

PR title references the story; body ends with Closes #348, references the parent epic and governing artifacts above.

🤖 Posted on behalf of @joestump by Claude.