Update bootstrapper samples and upload guidance

Fix gene parsing and apply expression mappings

increase col-label header font size to 14px

add single file hint to gene expression drop zone

update step descriptions: remove file format references, rename gene expression CSV label

simplify upload UI: remove numbered boxes, generic drop text, remove file format hints, fix col-label font size

fix optional tag border to purple

center download button, stats as subtle summary line above

fix: accumulate multiple files across uploads, add remove × button

add sample file downloads in each upload card

redesign: 2x2 single-page layout, copyright top, 16px font, FEA→MeMo

add download progress bar

hide all warning/technical output from user

hide logs, fix upload text, auto-scroll to download

fix: add libexpat1 for python-libsbml

fix: wire up real backend, /api/ prefix, blob download

move prefix warning to under step 2

add species prefix mismatch validation

initial build

initial commit