Improve tokenised funds chart labels

[miohtama]

Why

The tokenised funds chart became hard to scan as more funds were added. It needed a predictable seven-entry breakdown plus an Other slice, curator logos on desktop labels, and a cleaner mobile layout without rounded label boxes or logos.

Lessons learnt

ECharts rich label images work well for desktop curator branding, but mobile labels need to stay text-only to fit all chart slices cleanly. The shared market-share helper also needs an explicit standalone slice limit instead of relying only on percentage thresholds.

Summary

• Added a reusable standalone slice limit to the market-share pie helper and covered it with a unit test.
• Added optional chart label logos for curator-branded charts, while suppressing those logos on mobile.
• Updated tokenised funds to show seven named fund slices plus Other and tuned mobile labels to use square boxes.