echarts-gl bundles the clay.gl WebGL engine, inflating the single-file
HTML to ~1.24MB. Store the inlined module JS gzip+base64-encoded and
inflate at runtime via DecompressionStream + a deferred module bootstrap,
cutting the UI shell to ~512KB (below the prior 786KB 2D baseline).

Also extend the axis-swap selector to the z dimension: swap options are
now k-permutations of the present axis roles, enabling 3D<->2D toggling
(xyz vs nxy). z is only offered alongside both x and y, since a 3D floor
requires an x/y grid.

- Fullscreen button (Maximize2/Minimize2) on every chart card via
  requestFullscreen; chart height expands to fill viewport
- Extract module-level helpers in use3DChartOptions (round2,
  mapPoints, makeLabel, makeAxisCommon) to eliminate duplication
- Switch 3D shading to lambert + ambient 0.9 / main 0.3 to minimize
  face-darkening during rotation without losing depth cue

ScaleSelector hides the log/linear toggle when the active chart is 3D
(x+y+z present) — log scale isn't supported for 3D yet. vite.config
now logs emitted HTML size before/after bundle compression.

- ui: add Auto-rotate toggle (3D charts only) wired to grid3D.viewControl
- ui: fix blank 3D saveAsImage — cap export pixelRatio at device dpr so
  zrender composites the WebGL layer instead of a 2D-only redraw
- parser: reject group patterns/regex that use zAxis without both x and y
  (z is the depth dim of a 3D chart and needs an x/y floor); add tests

- shared tooltip theme (light/dark) so 2D and 3D match
- 2D tooltip: per-series y-totals + labeled x-marginal sum
- 3D tooltip: Σ z / Σ x / Σ y, precomputed cell aggregates for O(1) hover
- 3D sums reflect legend z-toggle via controlled selection

- new ui/3d-charts page; sidebar entry; cross-links from grouping/root/merge/ui pages
- features, roadmap, settings, swapping updated for z-axis, auto-rotate, fullscreen, axis-sum tooltips
- AxisSwapper: 1D data offers only x/y placement (drop useless name grouping)

Chart builders: extract useSortedSeriesData, getEffectiveScale,
computeSeriesTotals, sortByAxisTotal into shared/common.ts; add
makeDataItem to seriesConfig.ts; remove dead createBar/LineSeriesConfig;
decompose 209-line pie options into helpers + spec-driven series arrays;
lift 3D inline sort closure to shared util. bar/line/pie options each
~25-35% smaller.

Badges: new useSortedHistory composable + HistoryPopover presentational
component; Cpu/Os/TimestampBadge become thin wrappers.

Settings: useSyncedSetting writable-computed kills ref+watch+handler
triples in ChartSettings, ScaleSelector, AutoRotateToggle; dedupe
is3DChart/isAxisChart into useActiveChartShape composable.

Dashboard: useDashboardInit composable owns init watchers + title side
effect; split template into BenchmarkHeader, LoadingSkeleton, LoadError,
AppFooter presentational components. 202 → 84 lines.

Helpers: isValidIndex, SORT_ORDERS, SCALE_TYPES replace 5 inline bounds
checks and hardcoded validation arrays.

Net: 3855 → 3536 LOC (-319), bundle delta < 1 kB.