fix: Prevent getWorldPosition error in promo shader

[HarshMN2345]

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Summary by CodeRabbit

• Refactor
  • Updated shader component's internal sizing mechanism for improved framework compatibility.

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Project ID: 688b7bf400350cbd60e9

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Walkthrough

This pull request refactors src/lib/components/promos/shader.svelte to replace the viewport object with a size object sourced from useThrelte(). All references to viewport dimensions ($viewport.width and $viewport.height) are updated to use the corresponding size properties ($size.width and $size.height) with default fallbacks of 1. Shader initialization, aspect ratio calculation, viewport size assignment, and mesh scaling are adjusted to use the new size data source.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The PR title 'fix: Prevent getWorldPosition error in promo shader' directly addresses the main issue described in the PR objectives - a runtime error about getWorldPosition being undefined in the promo shader component.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Merge Conflict Detection	✅ Passed	✅ No merge conflicts detected when merging into main

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix-threlte-viewport-crash

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