Migrate remaining Svelte 4 reactive statements to Svelte 5 $derived:
- media/audit/+page.svelte: Convert allSelected, hasSelection, selectedSize to $derived
- universe/compose/+page.svelte: Convert postType, initialContent to $derived
- Also migrated all let declarations to $state() in audit page for consistency
All reactive statements now use Svelte 5 runes mode.
- Update media management page with album associations
- Enhance media audit page with better reporting
- Improve regenerate thumbnails page
- Update post pages to use EnhancedComposer
- Update universe compose page with new editor
- Update ProjectForm to use EnhancedComposer
- Add better error handling and loading states
- Improve form validation across admin pages
Modernizes admin workflows with unified components.
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
