test: use playwright text locator waitFor in live app smoke tests

[beths-ledger]

✅ Checklist

• npx changeset was attached.
• Covered by automatic tests.
• Impact of the changes:
  • CI should be less flakey on earn smoke tests like https://github.com/LedgerHQ/ledger-live/actions/runs/11213282864/job/31166142233

📝 Description

• wait for load state on "goToEarn()" because this is actually a "click" event that acts like a navigation event, so prefer to use the default for playwright goTo which is load.
• Use text locator instead of custom waitfor in LiveApp web view smoke tests. As recommended by the playwright docs
  see:
• https://playwright.dev/docs/navigations
• https://playwright.dev/docs/other-locators

❓ Context

• JIRA or GitHub link: CN-776

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🧐 Checklist for the PR Reviewers

• The code aligns with the requirements described in the linked JIRA or GitHub issue.
• The PR description clearly documents the changes made and explains any technical trade-offs or design decisions.
• There are no undocumented trade-offs, technical debt, or maintainability issues.
• The PR has been tested thoroughly, and any potential edge cases have been considered and handled.
• Any new dependencies have been justified and documented.
• Performance considerations have been taken into account. (changes have been profiled or benchmarked if necessary)

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