feat(fusion): allow fetching quotes for cross chain swaps

[meeh0w]

• CP-13162

Changes

• Adds initializers for Lombard and Avalanche EVM bridges
• Cleans up the whole SDK initialization process (splits into multiple hooks/utils)

Known issues

• There are a lot of routes you will NOT get a quote for (e.g. it's possible to select AVAX -> Bitcoin, but you won't get a quote for it). This will be fixed in the upcoming PRs.

• There is not tracking yet. If you want to see the progress of your transaction, get your transaction hash (click the success toast) and go to this URL:

  https://proxy-api.avax.network/proxy/markr-staging/cross-chain/status/<tx-hash>
  

  When finalized is true, you should see the transaction hash on the target chain and funds on your account.

Testing

Play around with the Fusion feature. You should be able to select any token from chains supported by the SDK as the target token.

Screenshots

Checklist for the author

• I've covered new/modified business logic with Jest test cases.
• I've tested the changes myself before sending it to code review and QA.

[Copilot]

Pull request overview

Enables Fusion to fetch quotes for cross-chain swaps by introducing bridge/service initialization plumbing and splitting SDK initialization into smaller hooks/utils.

Changes:

• Expanded Fusion feature flags to enable/disable individual transfer services (Markr, Avalanche EVM, Lombard directions).
• Added Fusion helpers/hooks to derive environment, enabled services, and service initializers; updated TransferManager creation accordingly.
• Added signer types and extended the EVM signer to support message signing.

Reviewed changes

Copilot reviewed 16 out of 18 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
packages/types/src/feature-flags.ts	Replaces the single Fusion gate with multiple service-specific Fusion gates.
packages/common/src/feature-flags.ts	Adds defaults/disabled values for new Fusion feature gates.
apps/next/src/pages/Portfolio/.../PortfolioActionButtons.tsx	Switches gating check to the new Fusion feature flag.
apps/next/src/pages/Fusion/types.ts	Adds a shared Signers type for Fusion hooks/services.
apps/next/src/pages/Fusion/lib/signers/evm.ts	Updates EVM signer type and adds signMessage support.
apps/next/src/pages/Fusion/lib/getServiceInitializer.ts	Centralizes creation of service initializer objects per service type.
apps/next/src/pages/Fusion/lib/getEnvironment.ts	Adds environment selection logic for TransferManager creation.
apps/next/src/pages/Fusion/lib/getEnabledTransferServices.ts	Derives enabled transfer services from feature flags.
apps/next/src/pages/Fusion/contexts/hooks/useTransferServiceInitializers.ts	Hook to build service initializers for enabled services.
apps/next/src/pages/Fusion/contexts/hooks/useTransferManager.ts	Refactors TransferManager creation to use new hooks and enabled services.
apps/next/src/pages/Fusion/contexts/hooks/useTransferEnvironment.ts	Hook wrapper around environment selection.
apps/next/src/pages/Fusion/contexts/FusionStateContext.tsx	Uses the new TransferManager hook and broadens target token list input.
apps/next/src/pages/Bridge/.../hooks/index.ts	Stops re-exporting useBridgeEnvironment from this index.
apps/next/src/pages/Bridge/.../NextUnifiedBridge.tsx	Updates import to use the app-level useBridgeEnvironment hook.
apps/next/package.json	Bumps unified-asset-transfer dependency version.
.env.example	Clarifies Markr env vars usage for Fusion swap.

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[frichards]

🌈 🦄 Approved!