Allow clearing of memo values when submitting empty input in SendScene2

[Jon-edge]

CHANGELOG

Does this branch warrant an entry to the CHANGELOG?

• Yes
• No

Dependencies

none

Requirements

If you have made any visual changes to the GUI. Make sure you have:

• Tested on iOS device
• Tested on Android device
• Tested on small-screen device (iPod Touch)
• Tested on large-screen device (tablet)

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Note

Submitting an empty memo now clears the selected memo (and legacy unique identifier) in SendScene2.

• SendScene2:
  • Allow empty memo submission to clear the corresponding spendInfo.memos entry; if legacy, also clear spendTarget.memo and spendTarget.uniqueIdentifier.
  • Update memo validation to accept empty input (skips error check) and refine types/handlers.
• Changelog: Add entry noting the ability to clear memo values via empty input.

^{Written by Cursor Bugbot for commit 8c92e28. This will update automatically on new commits. Configure here.}

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[swansontec]

Optional change.

[Jon-edge]

Trying to deal with the optional change kept giving new bugbot complaints. Just merging as-is for now.

If we revisit this area of code I'm sure we'll see the bugbot comment again.