User-facing theme toggle ships now that the design system has
been audited end-to-end. A Sun/Moon button lives between the
threat indicator and the SYSTEM status pill in the topbar — same
slim 28x28 voice as the rest of the topbar controls, no chrome
shouting at the user.
Click coords drive a View Transitions API circle clip-path that
grows from the cursor to the farthest viewport corner over 520ms
with the project's standard --ease curve. Browsers without
startViewTransition (older Firefox, Safari < 18) fall through to
an unanimated swap — the hook returns instantly in that case.
Persistence is two-tier:
- localStorage decnet_theme — the user's saved preference, the
thing the topbar toggle writes. Survives reloads, applies
everywhere.
- sessionStorage decnet_theme_lab — dev-mode lab override (Task
3). Tab-scoped, wins on boot so devs can A/B without nuking
the saved preference.
App.tsx hydrates both on first mount in the right order so the
correct theme is on <html> before the first paint.
useThemeToggle is a small hook in lib/ rather than a Layout-only
helper so the same toggle can be reused later from a settings page
or hotkey.
Route all lucide-react icon usage through a single src/icons.ts
re-export that imports each icon from its own per-icon module
(lucide-react/dist/esm/icons/<name>) instead of the barrel.
Bundle-size impact: none (29kB icons chunk unchanged — tree-shaking
was already effective with sideEffects:false). Dev-experience win:
Vite transforms 247 modules instead of 1848 because the dep
optimiser no longer pre-bundles the full lucide barrel — faster
cold start and HMR.
Ambient d.ts declares the wildcard module so TS accepts per-icon
imports; lucide ships .d.ts only for the barrel.
Seven icons were renamed upstream and still work through the barrel
via aliases (AlertTriangle -> triangle-alert, BarChart3 -> chart-column,
CheckCircle -> circle-check-big, Filter -> funnel, PlusCircle ->
circle-plus, Sliders -> sliders-vertical, UploadCloud -> cloud-upload,
Fingerprint -> fingerprint-pattern). Component call sites stay on
the legacy names; the renames live only in icons.ts.
