fix: SEO image URL paths

[gocanto]

Summary

• normalize generated SEO image paths to remove parent directory traversal segments
• add regression test to ensure generated URLs point to the images directory

Testing

• go test ./metal/cli/seo -run TestGeneratorPreparePostImageNormalizesRelativeURL -count=1 -v

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https://chatgpt.com/codex/tasks/task_e_68e888915dc083338e9f7b9e8bafb7db

[gemini-code-assist]

Summary of Changes

Hello @gocanto, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses an issue where generated SEO image URLs could contain incorrect parent directory traversal segments, leading to broken links or improper indexing. By implementing a dedicated URL normalization function and integrating it into the image preparation logic, the change ensures that all SEO image paths are correctly formatted and consistently point to their intended locations, thereby improving the robustness and correctness of SEO-related image handling.

Highlights

• URL Normalization: Introduced a new normalizeRelativeURL function to clean generated SEO image paths by removing parent directory traversal segments (e.g., ../) and leading slashes, ensuring valid relative URLs.
• Regression Test: Added a comprehensive regression test, TestGeneratorPreparePostImageNormalizesRelativeURL, to validate that the preparePostImage function correctly normalizes URLs and that the generated URLs point to the intended images directory.

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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 gocanto/fix-image-directory-paths-for-seo-2025-10-10

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[gemini-code-assist]

Code Review

This pull request aims to fix SEO image URL paths by normalizing them to remove parent directory traversal segments. The approach introduces a new normalizeRelativeURL function and a regression test.

My review focuses on the robustness and efficiency of the new normalization function. I've found that the current implementation has some edge case bugs and can be inefficient. I've suggested a more robust implementation for normalizeRelativeURL. Additionally, I've recommended adding a dedicated unit test for this new helper function to cover various edge cases and ensure its correctness independently.