Diatoms: replace with UDE 'In the Wild 2024' cutouts (real microscope photos with natural backgrounds, frustule patterns visible) — matching the original look user preferred

Marine zooplankton: pad with actual #FFF background (was #F0F0F0 = visible bands); category pills bumped 11px→13px and padding 14→18px for readability

Replace marine_zooplankton (6) and fungal_spore (6) thumbnails with clean center-cropped versions — removed scale-bar artefacts (vertical lines on marine, '20 µm' legend on fungal)

Replace 6 diatom sample thumbnails with clean center-cropped 384x384 from DiatlAS (previous had scale-bar lines drawn on the originals)

remove 6 cyano sample images

v3.7: no-limit padding strip — eliminates all dataset border artefacts

v3.6: aggressive edge-stripe trim — kills residual dataset padding bars

v3.5: two-pass normalise — strip outer dataset padding, then aspect-fill on inner scene

v3.4: aspect-aware fill — diatoms+marine now subject-fill 90-95% of frame

v3.3: smart subject-bbox crop — uniform square frames, no black bars

v3.2: normalise all 36 images — square-pad + 384px + vignette (uniform microscope look)

v3.0: 36 samples (6 per category, same-microscope source) + clickable gallery polish

v2: side-by-side comparison Gemma 4 factory vs MicroLens v2 fine-tune