feat: add icon precaching config toggle

[CharlVS]

Summary

• add an app-level configuration flag to control icon precaching
• guard the coin icon precache routine behind the new configuration toggle

Testing

• flutter analyze (fails: The current Flutter SDK version is 3.32.5 but web_dex requires >=3.35.3)

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https://chatgpt.com/codex/tasks/task_e_68e940bbbf80832693076aa4d39dc72e

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Note

Introduce isIconPrecachingEnabled (default false) and conditionally run coin icon precaching in didChangeDependencies().

• Config:
  • Add isIconPrecachingEnabled (default false) in lib/app_config/app_config.dart to control asset icon precaching.
• App lifecycle:
  • Guard _precacheCoinIcons(...) in _MyAppViewState.didChangeDependencies() behind isIconPrecachingEnabled.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch codex/add-config-flag-for-icon-precaching

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[github-actions]

Visit the preview URL for this PR (updated for commit 442140a):

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[smk762]

Can you please mention the problem (or issue) this PR aims to solve, along with measurable test (if possible) to confirm it is solved?