feat: embed Stellar Expert activity widget with layout stability and …

[oscarj007]

Closes #91

Description

This PR addresses the landing page requirements by cleanly embedding the Stellar Expert activity widget with defensive design patterns to satisfy the strict acceptance criteria parameters.

Core Additions

• Layout Shift Prevention: Wrapped the iframe inside a structured .stellar-widget-container with a defensive min-height: 350px layout boundary to secure structural space before the remote iframe resources finish fetching.
• Graceful Error Fallbacks: Attached native DOM onload and onerror exception event traps alongside a 6-second defensive network timeout utility to completely drop and visually hide the widget container section if the external provider service undergoes service degradation.
• Styling Alignment: Centered the section neatly between the Call To Action block and the landing page footer layouts.

Verification Checklist

• Widget matches container flow layout dimensions
• Zero cumulative layout shifts observed during initial lifecycle paint
• Graceful display drops execute under simulated bad endpoint link setups

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Checks

• I read the contribution guide.
• I kept this pull request scoped to the linked issue.
• I ran the relevant local checks or explained why they were skipped.
• For Drips wave issues, I claimed the issue before opening this pull request.

Notes for Reviewers

Tested locally in a browser environment. The layout remains fully responsive and handles intermittent network timeouts gracefully by dropping the section container without breaking the UI flow.

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