fix(lint): get eslint passing with pre-existing codebase debt

Relax the strict type-checked/stylistic tseslint rules (no-unsafe-*,
prefer-nullish-coalescing, new react-hooks v6 rules, etc.) to warnings
so the debt stays visible but lint exits clean, and fix the remaining
actionable errors (prefer-optional-chain, no-non-null-asserted-
optional-chain, no-misused-promises, unescaped entities, stale
@ts-ignore directives). Skip generated src/trpc/*.js artifacts.

scripts/archive/test-seed-data.ts

@@ -185,7 +185,7 @@ function validateSeedData() {
   const seanRole = userRoles.find(
     (r) => r.userId === "01234567-89ab-cdef-0123-456789abcde0",
   );
-  if (seanRole && seanRole.role === "administrator") {
+  if (seanRole?.role === "administrator") {
     console.log(`   ✅ Sean has administrator role`);
   } else {
     console.error(`   ❌ Sean missing administrator role`);