fix: use relative URL for icon sprite to prevent loading failures

[devin-ai-integration]

What does this PR do?

Fixes an issue where all button icons throughout the UI were empty/invisible due to the SVG sprite failing to load.

Root cause: The IconSprites component was using an absolute URL based on NEXT_PUBLIC_WEBAPP_URL to load the sprite.svg file. When this environment variable was misconfigured (e.g., pointing to a different IP address than the actual server), the browser couldn't load the sprite, resulting in empty buttons.

Fix: Changed from absolute URL to relative URL (/icons/sprite.svg), which always loads the sprite from the same origin as the app, making it resilient to NEXT_PUBLIC_WEBAPP_URL misconfiguration.

Also fixed pre-existing lint warnings in the file by adding proper type annotations and refactoring the ternary to an if-else function.

Visual Demo

Before (empty buttons):

After (icons visible):

Mandatory Tasks (DO NOT REMOVE)

• I have self-reviewed the code (A decent size PR without self-review might be rejected).
• I have updated the developer docs in /docs if this PR makes changes that would require a documentation change. N/A - no documentation changes needed.
• I confirm automated tests are in place that prove my fix is effective or that my feature works. N/A - existing icon rendering tests cover this; fix was verified on deployed server.

How should this be tested?

1. Deploy to an environment where NEXT_PUBLIC_WEBAPP_URL is set to a different value than the actual server URL
2. Navigate to /event-types page
3. Verify that button icons (external link, copy link, ellipsis menu) are visible on each event type row
4. Check browser console - there should be no errors loading /icons/sprite.svg

Human Review Checklist

• Verify the relative URL approach works in all deployment scenarios (Vercel, self-hosted, embeds)
• Confirm the lint fixes (type annotations, if-else refactor) don't change runtime behavior

Checklist

• I have read the contributing guide
• My code follows the style guidelines of this project
• I have checked if my changes generate no new warnings

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[devin-ai-integration]

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