refactor(icons): migrate lucide-react to @phosphor-icons/react, remove dep

feat(frontend): roll design-system classes across all dashboard pages + fix sidebar toggle alignment

fix: remove opacity:0 flicker from all pages

feat: add DNA sequence output across BLAST, UniProt, sequencing, primers, and SequenceRetrieval

fix: resolve Vercel build errors (handleFind, SAMPLE_DNA, Set iteration)

feat: add Translate CDS tool to /analyze/tools page

Fix: alignment sample sequences, reverse complement tool, BLAST program filtering, sample buttons on structure/pathway pages

Sprint 3-7: Alignment, Structure Viewer, Pathway Analysis, Utility Tools, analyze page fully live