🎨 Palette: Make Favorites actions discoverable in empty state

[kastnerp]

💡 What

• Moved the Import JSON, Export JSON, and Export CSV action buttons out of the {#if favorites.count > 0} conditional block in FavoritesPanel.svelte so they are always visible.
• The Import JSON button is always enabled.
• The Export JSON and Export CSV buttons are visually and functionally disabled when the favorites list is empty.
• The Clear All button logic was conditionally wrapped so it remains hidden when the list is empty.
• Logged a new critical learning to .Jules/palette.md regarding data ingestion actions in empty states.

🎯 Why

Previously, if a user had an empty favorites list, the entire actions block was hidden. This created a UX trap: users could not import a previously saved favorites list if they didn't already have at least one favorite selected to trigger the actions block to appear. By always showing the import action, users can recover from this empty state seamlessly.

📸 Before/After

• Before: In the "Favorites (0)" state, only the message "Click the heart icon..." was visible. No action buttons were present.
• After: In the "Favorites (0)" state, the "Import JSON" button is fully actionable. The "Export JSON" and "Export CSV" buttons are visible but clearly disabled.

♿ Accessibility

• Added disabled:opacity-50 and disabled:cursor-not-allowed styles to export actions when the list is empty to provide visual feedback.
• Added explanatory title attributes (title="No favorites to export") to the disabled export buttons, ensuring screen reader users understand why the buttons are disabled, following the app's established accessibility patterns.

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PR created automatically by Jules for task 12997581831934750584 started by @kastnerp

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