Drop .ts suffixes from frontend imports for Next typecheck.

Production next build rejects allowImportingTsExtensions-style paths.

periscope/src/frontend/src/lib/findings-forest.test.ts

@@ -1,8 +1,8 @@
 import assert from "node:assert/strict";
 import { test } from "node:test";
-import { groupByWorstStatus, groupDomains, isProtocolFinding, worstStatus } from "./findings-forest.ts";
-import { isPcbExamFinding } from "./layout-finding.ts";
-import type { Finding } from "./types.ts";
+import { groupByWorstStatus, groupDomains, isProtocolFinding, worstStatus } from "./findings-forest";
+import { isPcbExamFinding } from "./layout-finding";
+import type { Finding } from "./types";
 
 function f(partial: Partial<Finding> & Pick<Finding, "designator" | "status">): Finding {
   return {

periscope/src/frontend/src/lib/findings-forest.ts

@@ -5,7 +5,7 @@ import {
   instanceWorstResult,
   protocolResultToFindingStatus,
   type ProtocolReportCheck,
-} from "./protocol-report.ts";
+} from "./protocol-report";
 
 export const STATUS_FOLDER: Record<FindingStatus, string> = {
   ERROR: "Error",

periscope/src/frontend/src/lib/protocol-report.test.ts

@@ -9,9 +9,9 @@ import {
   protocolResultRank,
   protocolResultToFindingStatus,
   sortProtocolChecks,
-} from "./protocol-report.ts";
-import { groupByWorstStatus } from "./findings-forest.ts";
-import type { Finding } from "./types.ts";
+} from "./protocol-report";
+import { groupByWorstStatus } from "./findings-forest";
+import type { Finding } from "./types";
 
 function f(partial: Partial<Finding> & Pick<Finding, "designator" | "status">): Finding {
   return {