phase-7: motion, an installable app, and a capture that survives no signal

GSAP carries the counter roll-ups, the bandeja card physics, the dialog
transitions and the three success moments FLOWS.md allows. Every one of
them checks prefers-reduced-motion first and does nothing when it is set.

boneyard and canvas-ui are not what SPEC.md's stack table says they are:
on npm the names belong to two abandoned projects that do neither job.
The skeletons were already ours; the two canvas spots are now sixty lines
each with no dependency. DECISIONS.md records the substitution.

The app installs, keeps a scan taken with no network in IndexedDB and
sends it when there is one, falls back to a page that explains itself,
and can push a deadline notice. Reading the log of what is queued is the
source of truth, so the notice clears when the capture actually lands.

The CSP now allows scripts by per-request nonce rather than by
'unsafe-inline'. That forced /offline to render per request: a
prerendered page carries a build-time nonce no live policy matches, so
its scripts were blocked and it never hydrated.

Two crashes fixed on the way. web-push throws on a VAPID subject that is
not https: or mailto:, and the code handed it APP_PUBLIC_URL, so any
machine with push keys died at boot; a misconfigured optional channel now
switches itself off and says why. And a subscription the push service
answers 410 for is deleted rather than retried forever.

Lighthouse on the production build: accessibility 100, best practices 96,
SEO 100, performance 73. The performance number is not trustworthy on
this machine and DECISIONS.md says why; total blocking time did fall from
17.6s to 1.7s once the hero canvas stopped drawing at full resolution
every frame and the landing page stopped importing GSAP.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

apps/web/src/components/pwa-provider.tsx

@@ -0,0 +1,27 @@
+'use client';
+
+import { useEffect } from 'react';
+
+/**
+ * Registers the service worker once, from the app shell.
+ *
+ * The URL is built with `import.meta.url` so the bundler emits the worker and gives it a
+ * stable path; `updateViaCache: 'none'` means a deploy is picked up on the next visit
+ * rather than whenever the browser feels like re-checking.
+ */
+export function PwaProvider() {
+  useEffect(() => {
+    if (!('serviceWorker' in navigator)) return;
+
+    void navigator.serviceWorker
+      .register(new URL('../lib/service-worker.js', import.meta.url), {
+        scope: '/',
+        updateViaCache: 'none',
+      })
+      // A browser that refuses to register one (private mode, an unsupported context) is
+      // not an error the reader can do anything about.
+      .catch(() => undefined);
+  }, []);
+
+  return null;
+}