fix: a failed write no longer follows you to the next row

[raman325]

Proposed change

Two leftovers from #1519, found by a review pass over it.

A failed write followed you to the next row. _writeError renders above the whole slot list, and _startEditing did not clear it. Fail a write on slot 1, then click slot 2's row directly instead of cancelling: slot 1's error sits above the row you are now typing into, reading as though it belongs to it. Cleared on edit start now, alongside the existing clears on cancel and on the next submit.

A doc comment outlived its field. #1519 removed _wasRevealedBeforeEdit but left /** Whether codes were revealed before editing started */ behind with nothing under it.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (which adds functionality)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• The new test is mutation-verified: dropping the clear fails it with expected 'Code already in use' to be undefined.
• Frontend suite green (820); prek clean; bundle rebuilt.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.19%. Comparing base (6d14528) to head (53d3e8d).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1521   +/-   ##
=======================================
  Coverage   99.19%   99.19%           
=======================================
  Files          66       66           
  Lines        8457     8458    +1     
  Branches      521      521           
=======================================
+ Hits         8389     8390    +1     
  Misses         68       68           

Flag	Coverage Δ
typescript	95.63% <100.00%> (+<0.01%)	⬆️

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Files with missing lines	Coverage Δ
ts/lock-codes-card.ts	90.46% <100.00%> (+0.02%)	⬆️

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