fix(stake): subnet custody copy matches the verified contract

[sktbrd]

Summary

• Rewrites the Gnars Builder subnet stake copy so every custody claim is backed by what the verified BuildersV4 contract (Base, 0x42BB…F4B9) actually does — verified on-chain before this change.
• Keeps the page's voice and sharpens it: the pitch is now "verifiable by anyone", which is the strongest claim for this audience.

Changes

• messages/en/stake.json + messages/pt-br/stake.json (4 strings each):
  • "Self-custody on Base" removed — funds sit in the upgradeable Morpheus contract; replaced with "you pull it straight from the contract. No middleman, no permission slip. Fully onchain on Base." (true: withdraw() is permissionless and pays msg.sender only).
  • "unlocked — withdraw anytime" → "unlocked — yours to withdraw".
  • "unlocks 7 days after you stake" → "after your last deposit" — deposit() resets lastDeposit, so a top-up re-locks the whole position.
  • Dialog disclaimer now says topping up restarts the 7-day lock on the full position.

Test plan

• JSON valid, prettier clean on touched files
• Runtime-verified on pnpm dev: PT-BR + EN captures of the subnet section and the stake dialog — no overflow, both locales render the new strings

Generated with Claude Code

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