test: add unit tests for earn tabs, rewards bar, GLV vault hook, and …

[gerani1]

…referral code hook

• Add unit tests for EarnPage tab navigation (Portfolio, Discover, Additional opportunities, Distributions)
• Add unit tests for RewardsBar covering zero rewards, non-zero rewards, loading state, and claim button state
• Add unit tests for useGLVVaultData hook covering success, RPC error fallback, wallet-connected/disconnected balance, and disabled state
• Add unit tests for useReferralCode hook covering stored code, on-chain fallback, not-found, and RPC error paths

Closes

Closes #234
Closes #235
Closes #236
Closes #237

Test plan

• bun run --cwd apps/web test passes for all four new test files
• Tab navigation tests use role="tab" assertions
• Rewards bar tests assert disabled/enabled claim button based on pending rewards
• GLV vault tests mock syntheticsReaderClient and cover error fallback path
• Referral code tests mock readStoredAffiliateCode and referralStorageClient.getReferralInfo

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