🎨 Palette: [UX improvement] Replace clear annotation link with button

[sheepdestroyer]

💡 What: Replaced the <a href="#"> link used for clearing annotations with a semantically correct <button type="button"> element, styled to look like the original link.
🎯 Why: Using an anchor tag with href="#" for a JavaScript action causes an unintended scroll to the top of the page when clicked, which disrupts the user experience. A native <button> provides the correct semantics without the scrolling side effect.
📸 Before/After: Visuals remain identical (the button uses an inline CSS reset to look exactly like the previous link).
♿ Accessibility: Improves accessibility by using a <button> element for an action, rather than an anchor tag which is meant for navigation.

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PR created automatically by Jules for task 17861087334840072462 started by @sheepdestroyer

Summary by Sourcery

Use a semantically correct button for clearing annotations without changing the existing visual presentation.

Bug Fixes:

• Prevent page jumps when clearing annotations by replacing the JavaScript action link with a native button.

Enhancements:

• Improve the semantics and accessibility of the annotation-clearing control while preserving its link-like appearance.

Chores:

• Document the guidance to use buttons instead of hash links for JavaScript actions.

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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

The PR changes the annotation clear control from an href="#" anchor to a styled button that invokes the same JavaScript handler, eliminating unintended page scrolling while improving semantic accessibility; the rationale is also recorded in the project palette guidance.

File-Level Changes

Change	Details	Files
Replace the annotation-clearing navigation link with a native button while preserving its link-like appearance and behavior.	Use <button type="button"> for the clear action to prevent hash-navigation scrolling and provide correct action semantics. Apply inline styling to remove default button chrome and retain the existing red, underlined link presentation. Keep the existing clearAnnotation(${idx}) click handler unchanged.	router/static/visualizer.html
Document the implementation guidance for JavaScript-only actions.	Record the accessibility and UX rationale for avoiding <a href="#"> in favor of styled buttons.	.Jules/palette.md

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Sourcery assessment

Approved.

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