fix(treasury): sponsorship card counts Morpheus stakes in Staked

[sktbrd]

Summary

• User report: the treasury's Sponsorship yield card showed only Morpho vault TVL per rider — Morpheus stakes were invisible ("the orbit is more complete"). Confirmed: Yan showed $2.00 with $22 of Morpheus USDC behind him; Will showed a dash with $31 staked.
• The per-rider column now prints the athlete's total (vault + Morpheus) — the same figure the orbit node prints — under a header renamed "Staked" (EN) / "Em stake" (PT), and the total row is the graph's own headline total, so the two pages cannot disagree.
• The yield column stays vault-fee-only deliberately: the fee is the only per-rider-attributable earning; the treasury's MOR share exists only as a graph-level aggregate and is already named in the headline ("Vault fee + MOR rewards"). The rename is what keeps the two columns from being read as a rate.

Changes

• src/components/treasury/SponsorshipYield.tsx — tvl: a.total, total row = graph.total, comments rewritten
• messages/{en,pt-br}/treasury.json — colTvl/totalTvl relabeled both locales

Test plan

• tsc / eslint / prettier clean; suite passes
• Runtime captures EN+PT: Yan $24.00, Will $31 (was dash), Total staked $79.53 == /stake headline

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