add user confirm for manual withdraw input when equivalent to max

[smk762]

closes #3294

To test:

• Login to as funded wallet
• Enter a funded coin page
• Prepare a withdrawal for the full amount of the address balance, without using the max input field
• See confirmation pop up appear
• if cancel, see withdraw error message (same as previous)
• if confirm, see withdraw confirmation details
• confirm transaction sends successfully

I've tested this with LTC, ATOM and MATIC in web, please check a diverse set of coins to confirm.

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Note

When a manual withdrawal equals the spendable balance and preview fails, show a confirmation to switch to Max (deducting fee), auto-retry preview, and temporarily suppress the preview error.

• Withdraw flow
  • Add listener on previewError to detect manual amount matching spendable (with epsilon) and prompt user to switch to Max (fee deducted).
    • On confirm: dispatch WithdrawFormMaxAmountEnabled(true) and re-submit preview.
    • Temporarily suppress preview error display while dialog is shown.
  • Propagate suppressPreviewError through WithdrawFormContent → WithdrawFormFillSection and gate ErrorDisplay with it.
  • Use decimal for precise amount comparison.

^{Written by Cursor Bugbot for commit 62cfea1. This will update automatically on new commits. Configure here.}

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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 handle-manual-max-withdraw

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[github-actions]

Visit the preview URL for this PR (updated for commit 0081528):

https://walletrc--pull-3296-merge-hgrmur1q.web.app

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[takenagain]

Confirmed on web with DOGE, AVAX, ARRR, USDT-BEP20, and IRIS

[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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