🎨 Palette: ViewControls Accessibility Improvements

[endlessblink]

💡 What: Added dynamic aria-label, aria-expanded, and aria-pressed attributes to the icon-only toggle buttons ("Filter Toggle" and "Hide Done Tasks") in src/components/layout/ViewControls.vue.

🎯 Why: Icon-only buttons lacking accessible names are difficult or impossible for screen reader users to understand. Additionally, without aria-expanded and aria-pressed, users cannot perceive the current active state of these toggles.

♿ Accessibility:

• Added :aria-label="showFilters ? 'Hide filters' : 'Show filters'" and :aria-expanded="showFilters" to the Filter Toggle.
• Added :aria-label="hideDoneTasks ? 'Show completed tasks' : 'Hide completed tasks'" and :aria-pressed="hideDoneTasks" to the Hide Done Tasks toggle.
  These bindings dynamically update alongside their visual state, ensuring a synchronized and intuitive experience for assistive technology users.

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PR created automatically by Jules for task 4366436374218107187 started by @endlessblink

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