🎨 Palette: Fix clear annotation link behavior

[sheepdestroyer]

💡 What: Replaced the <a href="#"> clear annotation action with a native <button type="button"> that looks identical.
🎯 Why: Clicking the href="#" link would cause the page to jump to the top, which was disorienting when reviewing datasets down the page.
📸 Before/After: Visuals are identical, but behavior is fixed.
♿ Accessibility: Better semantic HTML by using a button for a JS action rather than a link.

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PR created automatically by Jules for task 8863069444126633097 started by @sheepdestroyer

Summary by Sourcery

Use a semantically appropriate button for clearing annotations without changing the control’s visual appearance.

Bug Fixes:

• Prevent clearing annotations from jumping the page to the top by using a native button for the action.

Enhancements:

• Improve the semantic accessibility of the annotation-clearing control while preserving its existing appearance.

Chores:

• Record the guidance for replacing hash links used for JavaScript actions with buttons.

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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

The clear annotation control now uses a native button instead of an href="#" link, preventing unwanted page jumps and improving semantic accessibility while retaining the existing appearance and behavior.

File-Level Changes

Change	Details	Files
Replace the clear-annotation link with a semantically correct button while preserving its visual appearance.	Use button type="button" for the JavaScript clear action. Apply inline styles to retain the link-like red, underlined presentation. Keep the existing annotation index and clearAnnotation click handler unchanged.	router/static/visualizer.html
Document the usability and accessibility lesson behind the control change.	Record that href="#" can unexpectedly move the page to the top. Recommend native buttons with styling resets for JavaScript actions.	.Jules/palette.md

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Hey - I've reviewed your changes and they look great!

Sourcery assessment

Approved.

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