feat: add prepareForSend for EVM and SVM connector

[danielbate]

• Closes FE-1490

Summary

1. Added usePrepareForSend = true flag to connectors to indicate support for the inverted flow
2. Implemented prepareForSend method in all connectors that:
   • Prepares and signs transactions
   • Returns the prepared transaction without submitting it
3. Refactored predicate-based connectors (EVM, Solana, WalletConnect) to use a shared helper method for transaction preparation

Checklist

• I've added error handling for all actions/requests, and verified how this error will show on UI. (or there was no error handling)
• I've reviewed all the copy changed/added in this PR, using AI if needed. (or there was no copy changes)
• I've included the reference to the issues being closed from Github and/or Linear (or there was no issues)
• I've changed the Docs to reflect my changes (or it was not needed)
• I've put docs links where it may be helpful (or it was not needed)
• I checked the resulting UI both in Light and Dark mode (or no UI changes were made)
• I reviewed the entire PR myself (preferably, on GH UI)

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Name	Status	Preview	Comments	Updated (UTC)
fuel-connectors	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 25, 2025 8:03pm

[github-actions]

Coverage Report for Fuel Wallet (./packages/fuel-wallet)

Status	Category	Percentage	Covered / Total
🔵	Lines	61.6%	146 / 237
🔵	Statements	61.6%	146 / 237
🔵	Functions	56.66%	17 / 30
🔵	Branches	77.77%	21 / 27

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[github-actions]

Coverage Report for Fuel Development Wallet (./packages/fuel-development-wallet)

Status	Category	Percentage	Covered / Total
🔵	Lines	100%	19 / 19
🔵	Statements	100%	19 / 19
🔵	Functions	100%	1 / 1
🔵	Branches	100%	1 / 1

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[github-actions]

Coverage Report for Fuelet Wallet (./packages/fuelet-wallet)

Status	Category	Percentage	Covered / Total
🔵	Lines	40.9%	27 / 66
🔵	Statements	40.9%	27 / 66
🔵	Functions	33.33%	1 / 3
🔵	Branches	100%	1 / 1

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