feat: yield withdraw polishes

[gomesalexandre]

Description

Spotted those when once again testing the feature with akschual funds as a user and this didn't look right:

• Information overload when withdrawing, i.e doesn't make sense to see APY, est. yearly returns, or interest accrual explainers when withdrawing - did keep the immediate/delayed exit explainer as it does make absolute sense for withdraws
• Also noticed a bug when all is currently being unstaked (e.g for ATOM, but really for any with delayed unstaked that need to be finalized): able to click unstake but shouldn't be able to, as there's nothing to unstake

This PR fixes both!

Issue (if applicable)

closes #

Risk

Low - UI-only changes: filtering explainers by action type and disabling unstake button when no active balance.

What protocols, transaction types, wallets or contract interactions might be affected by this PR?

No protocol/transaction changes. Affects yield position card UI and withdraw/exit modal explainers.

Testing

Engineering

• Navigate to a yield position with all balance in exiting/pending state (e.g. ATOM staking)
• Confirm Unstake button is disabled with tooltip: "No active balance available to unstake."
• Confirm Unstake button is enabled when there IS active staked balance
• Open withdraw/exit modal and confirm APY, est. yearly returns, and interest accrual explainers are hidden
• Confirm the immediate/delayed exit explainer still shows in withdraw modal
• Open deposit/enter modal and confirm all explainers still show as before

Operations

• 🏁 My feature is behind a flag and doesn't require operations testing (yet)

Screenshots (if applicable)

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat_yield_unstaking_polish

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[gomesalexandre]

Whitespaces off!