docs: remove completed bookshelf and collections filter implementation plan
Remove BOOKSHELF_COLLECTIONS_FILTER_PLAN.md - this plan has been fully implemented: - Bookshelf page with SSR-first architecture and Alpine.js integration ✅ - Collections book picker modal with Alpine.store for state persistence ✅ - All TypeScript files written and working ✅ - All templates updated with HTMX/Alpine patterns ✅ - Navigation link added ✅ The implementation is complete and tested. This planning document lives on in git history for reference. Keeping the repository clean of completed plans. Implementation details preserved in: - SAVED_FILTERS_IMPLEMENTATION.md (for future saved filters feature) - docs/developer/alpine-patterns.md (Alpine.js patterns used) - Git commit history (all implementation commits)
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