fix: end-of-line label collision + padR for clean PNG export

[Flotapponnier]

What

The PNG export (and live chart) had two issues when many providers are displayed:

1. End-of-line labels all stacked on top of each other when providers shared similar Y values
2. Long names like "0x7cc0...e781" got clipped by the SVG viewport (padR=96 gave only 88px)

Fix

• Collision deflection: labels are now sorted by their natural Y position and each is pushed down until it clears the previous one (27px minimum gap = name line + value line + margin)
• Top-10 cap: only the top 10 non-excluded lines get inline labels. The HTML legend below still shows all providers. Avoids right-side clutter on 100+ provider charts like HL frontends
• padR 96 → 130: gives ~140px for label text, enough for truncated addresses and long names without clipping