fix: show plot on mobile by keeping body full-height flex layout

fix: prevent jumpy pan/zoom by cancelling stale fetches and bypassing ECharts clamping

chore: update uv.lock for numba optional dependency

build: add numba as optional 'fast' dependency, enable in Docker

test: add backend equivalence tests for resampling

refactor: dispatch resampling to pluggable backends

fix: match bucket edge computation with NumPy backend in Numba

feat: add Numba resampling backend with min_max and LTTB functions

fix: guard empty bucket edge case in lttb_single_indices

feat: add NumPy resampling backend with min_max and LTTB functions

docs: add implementation plan for optional Numba resampling

docs: add design for optional Numba resampling acceleration

refactor: improve demo_3d UX and code quality

fix: add GroupId to metadata skip list in demo_3d

refactor: align demo_3d layout with plot.html patterns