chore: update tiny-robot submodule and demo plugin styling

[gene9831]

Summary by CodeRabbit

• Style

  • Updated VitePress demo container background color to a lighter shade for improved visual presentation.

• Chores

  • Updated submodule references and configuration for release management.

[coderabbitai]

Walkthrough

Configuration updates to a Git submodule with branch tracking for the tiny-robot subproject, a commit reference bump for the same submodule, and a minor background color adjustment to the VitePress theme demo container from white to light gray.

Changes

Cohort / File(s)	Summary
Submodule Configuration .gitmodules, tiny-robot	Added branch specification (release/v0.3.x) to tiny-robot submodule configuration and updated submodule commit reference to a newer version.
Styling .vitepress/theme/style.css	Changed VitePress demo container background color from white (#fff) to light gray (#fafafa).

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

Poem

🐰 A gentle hop through configs and hues,
The submodule branch now points where it's due,
A whisper of gray replaces the white,
Tiny robot's upgraded, everything's bright!

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the two main changes in the pull request: updating the tiny-robot submodule reference and modifying the demo plugin styling in the CSS file.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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