Fix UnifiedEditor prop binding in App.vue

[konard]

Summary

• Root Cause: In App.vue, the UnifiedEditor component was receiving :cube="currentCube" instead of :current-cube="currentCube". Since the component defines its prop as currentCube (Vue kebab-case: current-cube), the mismatched :cube prop was silently ignored, causing the component to always have currentCube = null.
• Effect: The editor showed "No content selected" and all quick action buttons (Reset, Duplicate, Copy, Export) were disabled because hasContent was always false.
• Fix: Changed :cube to :current-cube in all three layout variants (desktop, tablet, mobile) in App.vue (lines 553, 667, 788).

Details

The UnifiedEditor component (src/components/UnifiedEditor.vue) defines:

export interface UnifiedEditorProps {
  currentCube?: SpectralCube | null  // Vue kebab-case: :current-cube
  ...
}

But App.vue was passing:

<UnifiedEditor :cube="currentCube" @update:cube="updateCube" />

The correct binding (matching UnifiedEditorWindow.vue line 26) is:

<UnifiedEditor :current-cube="currentCube" @update:cube="updateCube" />

Test plan

• TypeScript type checking passes (vue-tsc --noEmit)
• ESLint passes
• Prettier formatting passes
• All 3585 tests pass (vitest run)
• Verify that UnifiedEditor now shows cube parameters in Spectral mode
• Verify quick action buttons (Reset, Duplicate, Randomize, Copy, Export) work
• Verify mode switching (Spectral, FFT, Stack) functions correctly

Fixes #266

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[konard]

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