[5761] Add default timezone handling in DateTimeTimezonePicker component

[jvega190]

#5761

Summary by CodeRabbit

• Bug Fixes
  • Timezone selection now defaults to the user’s local timezone when no timezone is selected.

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ℹ️ Recent review info

⚙️ Run configuration

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Run ID: be6ff138-99ea-476d-a586-9eebf3a5da54

📥 Commits

Reviewing files that changed from the base of the PR and between 0a1d94f and 1a3f1f1.

📒 Files selected for processing (1)

• studio-ui/ui/app/src/components/DateTimeTimezonePicker/DateTimeTimezonePicker.tsx

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Walkthrough

Changes

Timezone picker behavior

Layer / File(s)	Summary
Default timezone fallback studio-ui/ui/app/src/components/DateTimeTimezonePicker/DateTimeTimezonePicker.tsx	The picker resolves the user timezone and uses it in the autocomplete when no selected timezone is available. The selected timezone state remains unchanged.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Bug fix

Suggested reviewers: jmendeza

Merge Risk: ⚪ Minimal · up to 1a3f1

The timezone fallback change has no confirmed merge-blocking risk.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 1 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly identifies the main change: default timezone handling in the DateTimeTimezonePicker component.
Description check	✅ Passed	The description provides a reference to issue #5761, which satisfies the repository template requirement for a ticket reference or full description.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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