🎨 Palette: Add focus-visible styles to ConversionAssets buttons

[anchapin]

💡 What: Added :focus-visible styles to interactive buttons in ConversionAssets.css.
🎯 Why: Enhances keyboard accessibility by providing clear visual focus indicators, ensuring keyboard users can easily see which element is active without affecting mouse users.
♿ Accessibility: Improved keyboard navigation support for ConversionAssets UI elements.

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PR created automatically by Jules for task 59125363831365138 started by @anchapin

Summary by Sourcery

Add keyboard-focus visible styling to ConversionAssets action buttons and document the accessibility pattern in Palette guidelines.

Enhancements:

• Add :focus-visible outline styles to ConversionAssets action, upload, close, edit, save, convert, and retry buttons to improve keyboard accessibility.

Documentation:

• Document the use of :focus-visible for custom interactive elements in Palette accessibility guidelines.

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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adds keyboard-accessible :focus-visible outline styles to all ConversionAssets action buttons and documents the accessibility pattern in the Jules palette notes.

State diagram for button visual states with focus-visible styles

stateDiagram-v2
  [*] --> Idle

  Idle --> Hover
  Idle --> FocusVisible

  Hover --> Idle
  Hover --> FocusVisible

  FocusVisible --> Idle

  state Idle {
    [*] --> Default
    Default: No_outline
  }

  state Hover {
    [*] --> Hovered
    Hovered: Hover_styles_only
  }

  state FocusVisible {
    [*] --> KeyboardFocused
    KeyboardFocused: Outline_2px_solid_3b82f6_with_outline_offset_2px
  }

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File-Level Changes

Change	Details	Files
Add :focus-visible focus ring styling for all primary ConversionAssets action buttons to improve keyboard accessibility.	Introduce a shared :focus-visible rule targeting refresh, retry, action, upload, close, metadata, convert, and details buttons. Define a consistent 2px solid blue outline with 2px outline-offset to clearly indicate keyboard focus without shifting layout.	frontend/src/components/ConversionAssets/ConversionAssets.css
Document the new accessibility pattern in the Jules palette guidelines.	Create a palette note describing why :focus-visible is preferred over generic focus styles for custom interactive elements. Capture an action item to always add outline and outline-offset :focus-visible styles for custom interactive elements going forward.	.jules/palette.md

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[sourcery-ai]

Hey - I've left some high level feedback:

• The hard-coded #3b82f6 focus outline color should likely be replaced with a Palette design token or existing theme variable so it stays consistent with the rest of the system and is easier to update later.
• The long selector list for :focus-visible suggests these buttons could share a common class (e.g. .ca-button) so the focus style is defined once and new buttons automatically inherit it.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The hard-coded `#3b82f6` focus outline color should likely be replaced with a Palette design token or existing theme variable so it stays consistent with the rest of the system and is easier to update later.
- The long selector list for `:focus-visible` suggests these buttons could share a common class (e.g. `.ca-button`) so the focus style is defined once and new buttons automatically inherit it.

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[Copilot]

Pull request overview

This PR improves keyboard accessibility in the Conversion Assets UI by adding explicit :focus-visible styling for key action buttons, helping keyboard users identify the currently focused control.

Changes:

• Added :focus-visible outline/offset styling for multiple button classes in ConversionAssets.css.
• Added a Palette learning note documenting the accessibility pattern and recommendation.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
frontend/src/components/ConversionAssets/ConversionAssets.css	Adds component-scoped :focus-visible styles for ConversionAssets action buttons.
.jules/palette.md	Documents the accessibility learning/action for using :focus-visible focus indicators.

[Copilot]

The PR description says this change improves keyboard focus "without affecting mouse users", but these rules only style :focus-visible. Mouse clicks can still trigger the global button:focus outline from frontend/src/index.css (button:focus, button:focus-visible), so mouse users may still see a focus outline. If the intent is to show focus rings only for keyboard navigation, consider removing/adjusting the global button:focus rule or explicitly overriding :focus (non-focus-visible) for these button classes.