feat: improve readability in knowledge graph

[beleevens]

Component

App (Desktop)

Problem / Motivation

1. Labels of memories are partly behind the ellipsis and impact readability.
2. Memories with long titles overlay on top of each other

Proposed Solution

1. Review and fix z-index of label vs ellipse/border
2. Different potential solutions: Increase space between memories / change font size / change width / truncate earlier

Alternatives Considered

No response

Additional Context

No response