🎨 Palette: Improve accessibility in MCP server popup controls

[billlzzz10]

💡 What: Added accessibility attributes to several interactive elements in the McpServerPopup component. Specifically:

• Added aria-pressed to the "Remote" and "Local" toggle buttons to reflect their active states.
• Added aria-expanded to the "Customize filters" toggle button to reflect the accordion's visibility state, and aria-hidden="true" to its decorative chevron icon.
• Added localized aria-labels to the "remove user/category/tag" buttons for screen readers, and aria-hidden="true" to their inner 'X' icons to prevent redundant announcements.

🎯 Why: To ensure users employing assistive technologies (like screen readers) can fully understand the state and purpose of the MCP configuration controls. Without these attributes, screen readers may announce ambiguous icons or fail to convey critical state changes (like toggling a filter section).

📸 Before/After: (Visual change not applicable, purely semantic HTML changes).

♿ Accessibility: Significant improvement in screen reader experience for the MCP Server Configuration feature by adhering to WAI-ARIA authoring practices for toggle buttons, accordions, and icon-only buttons.

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PR created automatically by Jules for task 16439218757150279979 started by @billlzzz10

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Summary by cubic

Improved accessibility in McpServerPopup by adding ARIA attributes so screen readers convey control states and purposes clearly. Toggles now use aria-pressed, the filters accordion uses aria-expanded, decorative icons are aria-hidden, and remove buttons have localized aria-labels.

^{Written for commit 1b1a255. Summary will update on new commits.}

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