playground: Fix arg0 and polish

[breezewish]

What problem does this PR solve?

close #xxx

What is changed and how it works?

Small polish.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Code changes

• Has exported function/method change
• Has exported variable/fields change
• Has interface methods change
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release notes:

NONE

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 82.35294% with 18 lines in your changes missing coverage. Please review.
✅ Project coverage is 42.27%. Comparing base (740a506) to head (aa4cdf2).

Files with missing lines	Patch %	Lines
components/playground-ng/cli_invocation.go	83.33%	3 Missing and 3 partials ⚠️
components/playground-ng/main.go	85.71%	4 Missing and 2 partials ⚠️
components/playground-ng/boot.go	0.00%	2 Missing ⚠️
pkg/tui/cliutil.go	75.00%	1 Missing and 1 partial ⚠️
components/playground-ng/command.go	88.89%	1 Missing ⚠️
components/playground-ng/daemon_mode.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2673      +/-   ##
==========================================
+ Coverage   42.20%   42.27%   +0.08%     
==========================================
  Files         422      423       +1     
  Lines       46781    46848      +67     
==========================================
+ Hits        19740    19804      +64     
  Misses      24379    24379              
- Partials     2662     2665       +3     

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2026-01-17 08:31:54.733370464 +0000 UTC m=+223542.347327320: ☑️ agreed by xhebox.