fix(wallet): fix wallet page jank during coin activation

[CharlVS]

Summary

• avoid repeatedly fetching pubkeys while coins activate by tracking in-progress requests

Testing

• flutter pub get --offline --enforce-lockfile (fails: version solving failed)
• flutter analyze (fails: version solving failed)

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https://chatgpt.com/codex/tasks/task_e_68559334727c83268a1a79bf91ce8b32

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[github-actions]

Visit the preview URL for this PR (updated for commit 4e5b8d5):

https://walletrc--pull-2806-merge-wrugm4gp.web.app

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[smk762]

I'm not going to run flutter analyse again to test this. Clicking the codex link gives me Error loading task.
Without some indication of what to test (perhaps an issue link?), I'm just left guessing.

Ok, so I log in with the CI branch. Is it faster? Hard to say, utxo came up fast, waited a bit more for EMVs. Repeated the process on prod, which had a few extra coins active, but didnt seem to take significantly longer.

All I can say with confidence is that this PR does not break login. Please suggest additional tests to assist with finding a tangible reason to approve this PR.