chore: refactor quickbuy to not rely on swaps state

[joaosantos15]

Description

Moves Quickbuy state management to local state vs using Bridge's slice.

Current tradeoff: native-token + gas sufficiency is no longer UI-blocked for QuickBuy, since raw fetchQuotes output doesn't carry QuoteMetadata.gasFee.effective.amount. If the user lacks gas, the tx will fail at submit time rather than being caught upfront. Acceptable for MVP.

Changelog

CHANGELOG entry:

Related issues

Fixes:

Manual testing steps

Feature: my feature name

  Scenario: user [verb for user action]
    Given [describe expected initial app state]

    When user [verb for user action]
    Then [describe expected outcome]

Screenshots/Recordings

Before

After

Pre-merge author checklist

• I've followed MetaMask Contributor Docs and MetaMask Mobile Coding Standards.
• I've completed the PR template to the best of my ability
• I've included tests if applicable
• I've documented my code using JSDoc format if applicable
• I've applied the right labels on the PR (see labeling guidelines). Not required for external contributors.

Performance checks (if applicable)

• I've tested on Android
  • Ideally on a mid-range device; emulator is acceptable
• I've tested with a power user scenario
  • Use these power-user SRPs to import wallets with many accounts and tokens
• I've instrumented key operations with Sentry traces for production performance metrics
  • See trace() for usage and addToken for an example

For performance guidelines and tooling, see the Performance Guide.

Pre-merge reviewer checklist

• I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).
• I confirm that this PR addresses all acceptance criteria described in the ticket it closes and includes the necessary testing evidence such as recordings and or screenshots.

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✅ E2E Fixture Validation — Schema is up to date
12 value mismatches detected (expected — fixture represents an existing user).
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