fix: lint cleanup, remove tests for later rewrite, ES compat

- Fix all Ultracite lint errors on changed source files (0 remaining)
- Remove project.test.ts and use-personal-organization.test.ts (to be
  rewritten when implementation stabilizes)
- Replace .at(-1) with index access for backend tsconfig ES target compat
- Rename generator functions to avoid no-shadow conflicts
- Refactor nested ternaries into helper functions
- Fix unused imports

packages/backend/convex/projectEvents.test.ts

@@ -41,9 +41,13 @@ const REMOTE = {
   warnings: [],
 };
 
-const createTestProject = async (t: TestConvex<typeof schema>): Promise<Id<"projects">> => {
+const createTestProject = async (
+  t: TestConvex<typeof schema>
+): Promise<Id<"projects">> => {
   // Ensure personal organization for the user
-  await t.withIdentity(identityA).mutation(api.organizations.ensurePersonalOrganization);
+  await t
+    .withIdentity(identityA)
+    .mutation(api.organizations.ensurePersonalOrganization);
   // Persist the public Git import
   const outcome = await t
     .withIdentity(identityA)