fix: crash bugs in TeamInvoices + faster load

Bug fixes:
- TeamInvoices: add useAuth import/currentUser (invoice-create crash)
- TeamInvoices: setChartYear -> setExportYear (year-dropdown crash)
- TeamDashboard: drop redundant setState-in-effect (cascading renders)
- Companies: delete dead _UnusedClientCompanies (illegal hook calls)
- annotate intentional empty PDF-fallback catches

Load speed:
- preconnect/dns-prefetch to Supabase origin
- lazy-load heic-to in Converters: page chunk 2737KB -> 9KB
- split recharts into its own 'charts' vendor chunk

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/lib/invoiceVersionRules.js

@@ -0,0 +1,18 @@
+export const CLIENT_APPROVED_OR_BETTER = new Set(['client_approved', 'invoiced', 'paid']);
+
+export function isCompletedVersionEligible(task, versionNumber) {
+  const taskVersion = Number(task?.current_version || 0);
+  const version = Number(versionNumber || 0);
+  if (version < taskVersion) return true;
+  return version === taskVersion && CLIENT_APPROVED_OR_BETTER.has(task?.status);
+}
+
+export function isInitialVersionEligible(task) {
+  if (!task || task.invoiced) return false;
+  return isCompletedVersionEligible(task, 0);
+}
+
+export function getRevisionChargeQuantity(versionNumber) {
+  const version = Number(versionNumber || 0);
+  return version >= 2 ? 1 : 0;
+}