🎨 Palette: [UX improvement] Enhance accessibility and fix page jump on clear action

[sheepdestroyer]

💡 What: Changed the 'clear' annotation link to a semantic button with an ARIA label, and added an ARIA label to the note input field.
🎯 Why: Clicking the previous <a href="#"> clear link caused the page to unexpectedly jump to the top. Changing it to a <button> fixes this interaction while CSS resets maintain its visual appearance. Adding ARIA labels improves screen reader compatibility for the form controls.
📸 Before/After: Visuals remain unchanged; functionality is smoother.
♿ Accessibility: Added aria-label to icon-only/inline actions and text inputs. Replaced semantic links with buttons for JS actions.

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PR created automatically by Jules for task 14341377501335738262 started by @sheepdestroyer

Summary by Sourcery

Improve annotation controls to provide accessible semantics and smoother clearing interactions.

Bug Fixes:

• Prevent page jumps when clearing annotations by using a button for the JavaScript action instead of a hash link.

Enhancements:

• Improve accessibility of annotation controls with semantic buttons and descriptive ARIA labels for the clear action and review note input.

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Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

The PR improves annotation controls by replacing the page-jumping hash link with an accessible button, adding accessible naming and explicit button semantics to the review-note UI, and documenting the pattern for future changes.

Sequence diagram for accessible annotation clearing

sequenceDiagram
actor Reviewer
participant Visualizer
Reviewer->>Visualizer: Click clear button
Visualizer->>Visualizer: clearAnnotation(idx)
Visualizer-->>Reviewer: Annotation cleared without page jump

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File-Level Changes

Change	Details	Files
Replace the annotation clear link with a semantic, visually link-like button to prevent page jumps during JavaScript actions.	Use a button with explicit button type and accessible name for clearing annotations. Apply inline CSS resets and link styling to preserve the existing appearance.	router/static/visualizer.html
Improve accessible naming and native control semantics in the annotation form.	Add an ARIA label to the review note input. Declare the Save Note control as a non-submitting button.	router/static/visualizer.html
Document the accessibility and interaction pattern for future palette changes.	Record guidance to use buttons for JavaScript actions and preserve link-like styling with CSS resets.	.Jules/palette.md
Update repository ignore configuration.	Add the new ignore entry.	.gitignore

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Sourcery assessment

Approved.

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