fix: Prevent deck creation on 'Enter' key when deck name already exists

[Giyutomioka-SS]

Purpose / Description

Ensure that pressing the "Enter" key does not create a deck when the deck name already exists, providing a snackbar notification and keeping the dialog open for user correction.

Fixes

• Fixes Deck picker "enter" key should not create the deck when the "ok" button is disabled #17044

How Has This Been Tested?

Realme 6 (API-30) and Emulator

Screen Recording

video_2024-10-01_17-46-57.mp4

Checklist

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• You have a descriptive commit message with a short title (first line, max 50 chars).
• You have commented your code, particularly in hard-to-understand areas
• You have performed a self-review of your own code
• UI changes: include screenshots of all affected screens (in particular showing any new or changed strings)
• UI Changes: You have tested your change using the Google Accessibility Scanner

[Arthur-Milchior]

Nice touch for the snackbar. Thanks a lot.
I think a short length would be far enough. Implementer choice.

I also think if we can't create the deck, we should return false. The shortcut was not actually used.

I don't know if the returned value is used by anything, so I won't block on this.

[david-allison]

https://github.com/ankidroid/Anki-Android/actions/runs/11149038356

Strings are clear. Let's go

[github-actions]

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