fix(DataTableToolbar): apply default bottom spacing

[khushal-winner]

Reduces marginBottom from theme.spacing(4) to theme.spacing(2) so consumers inherit the toolbar-to-table gap without per-call-site sx overrides. Callers can still override via sx.

Closes #1719

Notes for Reviewers

This PR fixes #

Signed commits

• Yes, I signed my commits.

Summary by CodeRabbit

• Style
  • Reduced the bottom spacing in the data table toolbar for a more compact layout.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 94dc6ce6-644a-4155-ac15-fb97a10ecd02

📥 Commits

Reviewing files that changed from the base of the PR and between a7c7004 and 850ed5a.

📒 Files selected for processing (1)

• src/custom/DataTableToolbar/DataTableToolbar.tsx

🚧 Files skipped from review as they are similar to previous changes (1)

• src/custom/DataTableToolbar/DataTableToolbar.tsx

---

📝 Walkthrough

Walkthrough

DataTableToolbar reduces the ToolbarRoot bottom margin from theme.spacing(4) to theme.spacing(2). No other styling, logic, props, or rendering changes are included.

Changes

DataTableToolbar spacing

Layer / File(s)	Summary
Default bottom spacing src/custom/DataTableToolbar/DataTableToolbar.tsx	ToolbarRoot now uses theme.spacing(2) for marginBottom instead of theme.spacing(4).

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly states the main change: default bottom spacing for DataTableToolbar.
Linked Issues check	✅ Passed	The change matches #1719 by setting the toolbar root marginBottom to theme.spacing(2), and no other behavior changed.
Out of Scope Changes check	✅ Passed	The PR is limited to the requested toolbar spacing adjustment and includes no unrelated code changes.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

---

_{Comment @coderabbitai help to get the list of available commands.}

[khushal-winner]

@KhushamBansal , is it good to go?

[KhushamBansal]

@khushal-winner I don't think we need a test for the sx override, since inline styles already take precedence. Could you remove the additional changes in DataTableToolbar.test.tsx?

[khushal-winner]

@KhushamBansal done.