refactor(svg): add a ?scale=log integration test verifying shorter tower heights

[JhaSourav07]

🧩 Background

?scale=log is tested for a 200 response but no test verifies that logarithmic scaling actually produces different (shorter for high counts) tower heights than linear.

🎯 Objective

Add a test that calls with the same high-count calendar under both scale=linear and scale=log and asserts the SVG output differs.

📁 Files to touch

• app/api/streak/route.test.ts

🛠️ Implementation steps

• Use a calendar with a high-count day (e.g. 20 contributions).
• Get both SVGs and compare that they are not identical strings.
• Optionally assert specific height values.

✅ Definition of done

• Test confirms scale=log produces different SVG than scale=linear.
• All existing tests pass.

[github-actions]

❌ Only the author of this issue (@JhaSourav07) can claim it.

[github-actions]

Hey @JhaSourav07! 🤖

My semantic scan detected that this issue might be a duplicate of #380 (Similarity: 89.5%).

Please check between these issues and close this one if it is a duplicate.

[github-actions]

Hey @JhaSourav07! 🤖

My semantic scan detected that this issue might be a duplicate of #372 (Similarity: 85.6%).

Please check between these issues and close this one if it is a duplicate.