feat(playground): Add 'Open in Playground' button to learning modules

[karanpatill]

Add 'Open in Playground' button to learning modules

This PR integrates the Learning section with the Playground by adding a button in each module that automatically loads the corresponding sample into the editor.

Motivation:
Users often want to immediately try out the concepts they just read about in a module. This button bridges the gap between learning and practice, improving the overall developer experience.

Changes:

• Added sampleName to steps.ts to map modules to samples.
• Updated LearnContent component in Content.tsx to display the "Open in Playground" button.
• Enhanced store init() in store.ts to handle the sample query parameter for auto-loading.
• Fixed mixed space/tab indentation in Content.tsx to resolve ESLint errors.

Refs #871

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[Atharva7115]

Thanks @karanpatill for working on this!

Great to see this being implemented based on the issue (#871).

I’ll check out the preview and share any thoughts if I notice something useful.