type safety and eslint cleanup

Created by: jedmund

Summary

• Remove unused imports and prefix unused variables across 22 files
• Replace any types with proper types (Record<string, unknown>, specific interfaces, etc.)
• Fix ESLint errors: unused expressions, missing imports, a11y label associations, stale reactive references
• Suppress legitimate edra/tiptap component warnings with correct svelte-ignore codes
• Fix unused CSS selectors in bubble menu components with :global() wrapping
• Move Lucide icon as any casts to script variables to avoid template lint issues
• Accept getter functions in createListFilters for reactive state compatibility

Zero ESLint errors remaining.