feat(frontend): Derived store for stake balances map

[AntonioVentilii]

Motivation

Similar to what we have with token balances, it will be useful to have a map of token ID vs stake data (for example staked balance and claimable rewards.

[Copilot]

Pull request overview

This PR introduces a derived store for stake balances, mapping token IDs to their staked amounts and claimable rewards. However, the implementation has critical architectural issues that create circular dependencies and duplicate exports.

Key Changes:

• Added StakeBalances type definition mapping token IDs to stake data
• Created stakeBalances derived store to aggregate stake position data
• Attempted to integrate stake balances into token UI data through a new file

Critical Issues:
The implementation creates a circular dependency: stake.derived.ts depends on enabledFungibleTokensUi from tokens.derived.ts, while the new tokens-ui.derived.ts attempts to redefine enabledFungibleTokensUi to depend on stakeBalances. Additionally, tokens-ui.derived.ts creates multiple duplicate exports that conflict with existing stores in tokens.derived.ts.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 8 comments.

File	Description
src/frontend/src/lib/types/stake-balance.ts	Defines the StakeBalances type mapping token IDs to staked and claimable amounts
src/frontend/src/lib/derived/stake.derived.ts	Implements the stakeBalances derived store but incorrectly depends on enabledFungibleTokensUi instead of enabledTokens, creating a circular dependency
src/frontend/src/lib/derived/tokens-ui.derived.ts	Creates duplicate exports (enabledFungibleTokensUi, enabledMainnetFungibleTokensUsdBalance, enabledMainnetFungibleIcTokensUsdBalance) that conflict with existing exports in tokens.derived.ts and calls mapTokenUi with an unsupported $stakeBalances parameter
src/frontend/src/tests/lib/derived/stake.derived.spec.ts	Provides comprehensive test coverage for the stakeBalances store including edge cases

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