* perf(context): cut context-tab render, hover and DNA costs
P0 — interaction/caching:
- isolate pointer hovers: chart-local hover stays immediate, cross-card previews
trail (140ms; 220ms in DNA mode) so sweeps cannot stack full-view renders;
- cache pure projections (assemble, DNA/file derivations) across hover/remount;
- remove forced layout from the flow/timing read paths, gate the hidden sidebar
copy, memoize picker options and tool tallies.
P1 — windowing/lazy rendering:
- window trend bars, file-activity rows, timing-strip segments (dense gradient)
and the browser DNA feed; off-screen rows use content-visibility;
- lazy-mount the browser card and the below-fold event/file row behind
height-matched skeletons, mounted on an idle slice / near the viewport;
- window DNA bands on long total-mode logs, tighten the DNA window, sample
per-bar gradient stops, and keep DNA+delta eager so its churn axis stays exact;
- force-mount + reveal for stats file-pill jumps into the lazy row.
Rendering-only by construction: axes, tooltips, ordering, DNA hit-testing and
every readout still come from the full model; scrolling only changes which rows
are in the DOM. Measured on a 987-step session: mount 986-1251ms -> ~510ms,
first paint 480-592ms -> ~80ms, zero long tasks; tab DOM 15,929 -> 3,226
(below-fold mounted ~4.7k); hover 30 -> 0 long tasks; DNA toggle 875 -> ~230ms.
Tests: new window/lazy/DNA/cache specs; lint, typecheck and 138-file 100%
per-file coverage green.
* fix(context): second-review follow-ups
- keep DNA bands fresh per header epoch, and force eager DNA+delta on long
logs so per-key churn axes stay exact;
- correct windowed spacer heights for the container flex gap: the file list
and the DNA feed now reproduce the full scroll height exactly;
- re-translate memoized picker/tooltip labels when the locale changes;
- re-observe lazy mounts across detach/reattach (a collapsed sidebar copy)
via a callback ref, keep forced mounts for stats jumps, and clear the
chart's local hover/DNA state on mouse leave;
- shrink the window for a mount that already has DNA on, and add the async
subagent count to the flow-measurement deps;
- repair the skeleton background rule and restore the accidentally
globalized .lc-heat-ctl .lc-card-sub selector.
