chore: keep the handlers this release touched within their size baseline

The register refusal codes, the end of the no-device rest, the
no-recipient annotation and the sign-in shell comment had each grown a
function the size ratchet holds. The codes become constants, the rest
ends through a helper beside the one that starts it, and the
annotation moves into that helper. The settings Web Push card dropped
under the limit when its subscription post moved out, so its entry goes.

src/__tests__/baselines/source-function-lines.json

@@ -1,7 +1,7 @@
 {
   "$comment": "Production functions over 200 lines, keyed \"file :: name\", and their length. Maintained by src/__tests__/source-size-ratchet.test.ts.",
-  "count": 337,
-  "total": 109501,
+  "count": 336,
+  "total": 109298,
   "entries": {
     "app/achievements/page.tsx :: AchievementsPage": 206,
     "app/api/admin/backups/upload/route.ts :: apiHandler(arg)": 275,
@@ -218,7 +218,6 @@
     "components/settings/sharing-section.tsx :: ShareLinksCard": 260,
     "components/settings/sources-section.tsx :: SourcesSection": 601,
     "components/settings/thresholds-editor-section.tsx :: MetricRow": 241,
-    "components/settings/web-push-card.tsx :: WebPushCard": 203,
     "components/symptoms/symptom-entry-form.tsx :: SymptomEntryForm": 317,
     "components/symptoms/symptoms-section.tsx :: SymptomsSection": 205,
     "components/targets/range-bar.tsx :: RangeBar": 220,