Fixed issues with DNA file uploads

[vishakh]

Parser (lib/genotype-parser.ts)

Rewrote the genotype file parser to fix a 57% upload failure rate identified via GA4 analytics. The failures broke down into two root causes: format detection routing files to the wrong parser, and individual parsers rejecting valid rows from edge-case provider exports.

Format coverage added or fixed:

• MyHeritage CSV — malformed double-quote escaping ("rs1"",""1"",...) now handled by stripping all " characters from field values
• FTDNA famfinder — column header lives in a # comment line and uses name instead of rsid; both are now recognized
• LivingDNA allele format — 5-column layout (rsid chr pos allele1 allele2) now combined into a 2-char genotype
• AncestryDNA chromosome 26 — mitochondrial chromosome normalized to MT
• AncestryDNA multi-separator — extra tabs creating empty fields now filtered before column indexing
• Generic 4-column TSV/CSV — RSID CHROMOSOME POSITION GENOTYPE headers with tab/comma delimiters now routed to the Monadic parser; purely space-separated headers fall through to the 23andMe whitespace parser to avoid a delimiter mismatch
• CRLF line endings — split('\n') replaced with split(/\r?\n/) across all parsers

Detection logic hardened: AncestryDNA detection now skips # lines (avoids false-matching 23andMe comment headers); detection scans 50 lines instead of 20 to handle files with long metadata preambles.

Upload UX (app/components/UserDataUpload.tsx, app/globals.css)

• Error display now shows the actual failure reason instead of the generic "Upload failed" tooltip
• Added a provider hint below the upload button ("23andMe, AncestryDNA, MyHeritage, FTDNA, LivingDNA, and more")
• Removed redundant pre-validation in the click handler that silently swallowed errors without setting error state
• console.error now emits structured diagnostics on parse and upload failures

Analytics (lib/analytics.ts)

• genotype_file_loaded now includes detected_format (23andme / ancestrydna / monadic) and file_extension
• genotype_file_upload_failed now includes file_extension
• File extension derived via lastIndexOf('.') so extensionless filenames do not leak as the extension value in analytics events