🎨 Palette: Add accessibility combine to empty states in ContentView, NodeModulesSection, and ProcessesView

[acebytes]

💡 What: Added .accessibilityElement(children: .combine) to the empty state VStacks across ContentView, NodeModulesSection, and ProcessesView.
🎯 Why: Previously, VoiceOver users would hear the empty state's text and icon sequentially as disjointed items. Combining them creates a single, coherent announcement that the list/page is empty.
📸 Before/After: Visuals are unchanged.
♿ Accessibility: Groups empty state information logically so VoiceOver users get immediate context instead of separate announcements.

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PR created automatically by Jules for task 12304270935819162946 started by @acebytes

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