[Devehab]

Closes #2388.

User-facing: in Usage → Token Attribution, a tile's label now grows with its share of the total, so the categories that dominate are the first names you see.

On large tiles, the label size is 28 * sqrt(share), clamped between the existing 11px and 18px. I used sqrt because tile area already grows linearly with share, so a linear size would blow up the top tile and flatten the rest. The size is also capped by the tile's height, so the value and meta lines under the label still fit. Those lines move down by the same amount the label grows.

Medium and small tiles are unchanged. Medium tiles keep the 9px label, and the smallest tiles still show no text, just the hover title. That already covers the issue's point about hiding labels on tiny tiles.

The main thing to look at is labelSize in Treemap.svelte. The 28 and 18 are judgment calls, and I'm happy to tune them.

[roborev-ci]

roborev: Combined Review (d692d7d)

Verdict: No findings at or above medium severity.

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Reviewers: 2x codex, codex (security), codex (test-value) | Synthesis: codex | Total: 2m32s