chore(frontend): remove dead code managerAvatars.ts

[NicoRuedaA]

Problem or opportunity

src/lib/managerAvatars.ts exists in the frontend codebase but is no longer imported or used anywhere. The avatar feature was removed from the manager profile, and this file is dead code that adds bundle size and confusion.

Proposed solution

Delete src/lib/managerAvatars.ts. Verify no imports reference it.

UX impact

None — file is already unused.

Acceptance criteria

• src/lib/managerAvatars.ts removed
• No import errors in build
• Bundle size slightly reduced

Scope

UI / UX

[NicoRuedaA]

PR: #66