feat: toggle yield trade earn flag

[gomesalexandre]

Description

Toggles the Earn tab feature flag on by default in base .env and removes the dev-only override from .env.development.

Issue (if applicable)

closes #

Risk

Low - Feature flag toggle only.

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

None. UI feature flag change only.

Testing

Engineering

• Confirm the Earn tab is visible by default without needing .env.development override
• Confirm all earn/yield functionality works as before

Operations

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

Screenshots (if applicable)

• develop:
• this diff:

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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_earn_tab_toggle

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