fix: remove WETH/FOX from rFOX stake modal asset selection

[gomesalexandre]

Description

Removes WETH/FOX from the staking asset selection dropdown in the Stake modal since the Arbitrum WETH/FOX Rewards program has been sunset. Users can still unstake and claim existing positions.

Issue (if applicable)

closes #11779

Risk

Low - UI-only change that filters out a sunset staking option from selection.

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

None. This only affects the asset selection UI in the rFOX Stake modal.

Testing

Engineering

1. Navigate to the Fox page
2. Click "Stake" button on the FOX tab
3. Click the asset dropdown in the Stake modal
4. Verify WETH/FOX is NOT shown as a selectable asset (only FOX should appear)
5. Verify unstake/claim still works on the WETH/FOX tab

Operations

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

Screenshots (if applicable)

• Stake

• Unstake

Summary by CodeRabbit

• Bug Fixes
  • Disabled WETH/FOX staking on Arbitrum. Users can still unstake and claim rewards via L1 and other supported assets.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

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📝 Walkthrough

Walkthrough

Modified StakeInput component to exclude the Arbitrum WETH/FOX staking asset from the user-selectable list. The change filters out the specific asset ID and appends the L1 asset ID, preventing WETH/FOX selection while maintaining L1 staking availability.

Changes

Cohort / File(s)	Summary
Staking Asset Filter src/pages/RFOX/components/Stake/StakeInput.tsx	Imported uniV2EthFoxArbitrumAssetId and added logic to exclude it from stakingAssetIds list, then append l1AssetId. Disables WETH/FOX selection in staking modal.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Suggested reviewers

• NeOMakinG
• 0xApotheosis

Poem

🐰 A hop, skip, and filter array so keen,
Remove the ETH/FOX from the staking scene,
L1 assets hop in to take their place,
One simple fix, no greyed-out disgrace! 🦊

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately and concisely describes the main change: removing WETH/FOX from the staking modal asset selection, which is the primary objective of this PR.
Linked Issues check	✅ Passed	The code changes directly address the acceptance criteria of issue #11779 by filtering out uniV2EthFoxArbitrumAssetId from stakingAssetIds, ensuring only FOX is selectable for staking.
Out of Scope Changes check	✅ Passed	All changes are focused and in-scope: the import and filtering logic directly implement the required removal of WETH/FOX from the stake modal asset selection, with no unrelated modifications.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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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 fix/remove-weth-fox-from-stake-modal

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[coderabbitai]

Actionable comments posted: 1

🤖 Fix all issues with AI agents

In `@src/pages/RFOX/components/Stake/StakeInput.tsx`:
- Around line 96-102: The useMemo for computing stakingAssetIds references
supportedStakingAssetIds and uniV2EthFoxArbitrumAssetId but they are missing
from the dependency array; update the dependency array of the useMemo that
defines stakingAssetIds to include l1AssetId, supportedStakingAssetIds, and
uniV2EthFoxArbitrumAssetId so the memo correctly tracks all used values (keep
the logic that filters out uniV2EthFoxArbitrumAssetId and concatenates l1AssetId
unchanged).