SEV-329: @switchev/web-shared package — formatters, markdown, waitForImage

Stands up the shared browser-helpers package (consumed by public/vendor/admin
via the Gitea npm registry) to de-duplicate copy-pasted frontend code:
- format.js: formatLabel/formatStatus/formatTimeline/formatBudget (single source
  of truth — these had drifted, see SEV-310).
- markdown.js: renderMarkdown (marked + strict DOMPurify; both peer deps).
- wait-image.js: waitForImage (was byte-identical in public + vendor).

ESM source package (no build step — Vite consumers import directly). publishConfig
points at the Gitea npm registry. node --test green (formatters).

Next: publish v0.1.0, then migrate each site to consume it and delete the copies.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/format.js

@@ -0,0 +1,39 @@
+// SEV-329: shared display formatters. These were copy-pasted (and subtly
+// divergent — SEV-310) across public/vendor/admin. Single source of truth here.
+
+/**
+ * Friendly label for an internal slug: replaces '-' and '_' with spaces and
+ * Title-Cases each word. e.g. "contract_pending" → "Contract Pending".
+ */
+export function formatLabel(val) {
+  if (!val) return '';
+  return String(val).replace(/[-_]/g, ' ').replace(/\b\w/g, (c) => c.toUpperCase());
+}
+
+/** Friendly status label (alias of formatLabel, named for intent at call sites). */
+export const formatStatus = formatLabel;
+
+const TIMELINE_LABELS = {
+  '4_to_6_months': '4–6 months',
+  '6_to_12_months': '6–12 months',
+  '12_to_24_months': '12–24 months',
+  flexible: 'Flexible',
+};
+
+/** Friendly conversion timeline. Falls back to formatLabel for unknown slugs. */
+export function formatTimeline(val) {
+  return TIMELINE_LABELS[val] || formatLabel(val);
+}
+
+const BUDGET_LABELS = {
+  'under-10k': 'Under $10,000',
+  '10k-25k': '$10,000 – $25,000',
+  '25k-50k': '$25,000 – $50,000',
+  '50k-100k': '$50,000 – $100,000',
+  '100k-plus': '$100,000+',
+};
+
+/** Friendly budget-range label for the wizard's slug values. */
+export function formatBudget(val) {
+  return BUDGET_LABELS[val] || val || '';
+}