Make dRep selection more neutral and dRep-agnostic

[Cerkoryn]

Updates mobile governance selection copy/labels to present DRep options more neutrally and support informed choice, with no changes to delegation logic or available options.

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Note

Medium Risk
Changes remove Yoroi-specific delegation shortcuts and combined stake+governance delegation transactions, which can alter user flows and pending-state handling across governance and staking screens. Risk is moderate because it touches transaction-building paths and multiple screens, but does not change core signing/auth logic.

Overview
Removes Yoroi-promotional governance UI: deletes YoroiDrepCard/YoroiRecordLink, drops remote-config controlled Yoroi DRep banners, and simplifies the DRep selection modal to only prompt for an ID/handle (with new fixed modal heights).

Unifies delegation state handling to be DRep-agnostic by collapsing pending-vote tracking to a single delegate state and replacing Yoroi-vs-other branching (isDelegatingToYoroiDrep, delegate-yoroi/delegate-other) with generic isDelegatingToDrep/drepDisplayId across Home, VotingOptions, and ChangeVote.

Removes the "Earn Rewards" banner feature and its staking+governance combined-delegation helper, and updates StakingCenter so pool delegation always builds a stake-only tx; the governance-required modal now routes users to governance options instead of delegating to a preset Yoroi DRep, with corresponding i18n string cleanup.

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