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feat(decnet_web/Layout): topbar dark/light toggle with circular reveal

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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.
This commit is contained in:
anti
2026-05-09 04:01:24 -04:00
parent 9cab37db3a
commit 438a6e3e45
7 changed files with 262 additions and 9 deletions
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18
decnet_web/src/index.css
View File

@@ -337,6 +337,24 @@ input:focus {
background-size: var(--grid-size) var(--grid-size);
}
/* ── Theme transition ───────────────────────────
* Disables the default cross-fade so the JS-driven
* circle clip-path in useThemeToggle.ts owns the
* reveal entirely. The new theme grows from the
* click point; the old theme stays put and is
* uncovered by the expanding circle. */
::view-transition-old(root),
::view-transition-new(root) {
animation: none;
mix-blend-mode: normal;
}
::view-transition-old(root) {
z-index: 0;
}
::view-transition-new(root) {
z-index: 1;
}
/* ── Scrollbar ─────────────────────────────────── */
* {
scrollbar-width: thin;