feat: add autocomplete support for mnemonic seed phrase input

[CharlVS]

Summary

This PR adds autocomplete functionality to the MnemonicValidator class to support an enhanced UI for the login flow.

Changes

• Added method: Returns BIP39 words that start with a given prefix, useful for implementing autocomplete when users enter their seed phrases word by word
• Added method: Provides access to all valid BIP39 words for custom autocomplete implementations
• Code formatting improvements: Enhanced readability of binary string conversion
• Updated bundled coins repo commit: Updated to latest commit hash

Usage Example

final validator = MnemonicValidator();
await validator.init();
final matches = validator.getAutocompleteMatches('aba');
// Returns: {'abandon', 'ability', 'about'}

Related

This change supports the UI login flow implementation in the main wallet repository.

---

Note

Adds autocomplete methods to MnemonicValidator for BIP39 word suggestions and exposes all words; minor formatting cleanup.

• Utils: MnemonicValidator
  • Autocomplete: Add getAutocompleteMatches(prefix, {maxResults = 10}) to return matching BIP39 words (case-insensitive), with initialization assert.
  • Wordlist Access: Add getAllWords() to return all valid BIP39 words, with initialization assert.
  • Minor: Reformat binary string construction for readability.

^{Written by Cursor Bugbot for commit a0bedc5. This will update automatically on new commits. Configure here.}

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✨ Finishing touches

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• Commit unit tests in branch add/ui-login-flow

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Visit the preview URL for this PR (updated for commit a0bedc5):

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[cursor]

Bug: Unpredictable Autocomplete Suggestions Due to Set Iteration

The getAutocompleteMatches method uses Sets for both its source wordlist and collected results. Since Set iteration order isn't guaranteed, hitting maxResults can lead to inconsistent autocomplete suggestions (different words or orders) for the same prefix across runs, creating an unpredictable user experience.