swarm-ui: match the try-out page to the backend's limits

The repo check takes the endpoint's own character set and refuses . and .. parts. The running and expired messages say a run can last up to half an hour and that a controller restart drops the result.

docs/swarm/ui.md

@@ -55,8 +55,8 @@ Give it a repo as `owner/name` and a PR number, then write a classification: a
 name, a description, a polarity (positive or negative) and a threshold from 0
 to 100. **add a classification** adds more, and **run** starts the run.
 
-A run takes a minute or more. The page says it's running and shows how long it
+A run takes a minute or more, and up to half an hour for ten classifications.
-has been, then shows the review's table: for each classification the verdict,
+The page says it's running and shows how long it has been, then shows the review's table: for each classification the verdict,
 the model's certainty, the threshold, whether the verdict counted and the
 reason. A classification that couldn't run shows its error where the reason
 would be. Under the table are the overall verdict, approve or request changes,

frontend/packages/swarm-ui/src/pages/review-tryout/ReviewTryOutPage.tsx

@@ -31,9 +31,9 @@ import "./ReviewTryOutPage.css";
 
 const TRY_OUT = "/api/review-classifier/try-out";
 const POLL_MS = 2000;
-// More classifications than this are not offered a row. Keep it in step with
+// More classifications than this are not offered a row. It is the try-out
-// the try-out endpoint's own cap, which answers a longer list with a 400 that
+// endpoint's own cap, which answers a longer list with a 400 that the page
-// the page shows as it is; the backend has no way to report it yet.
+// shows as it is.
 const MAX_CLASSIFICATIONS = 10;
 
 let nextKey = 0;
@@ -88,7 +88,8 @@ export function ReviewTryOutPage() {
         if (cancelled) return;
         if (res.status === 404) {
           stop({
-            detail: "the result expired before it was read: run it again",
+            detail:
+              "the result is gone, because it expired or the controller restarted: run it again",
           });
           return;
         }
@@ -214,7 +215,8 @@ export function ReviewTryOutPage() {
         <Panel title="result" icon="📋">
           {running ? (
             <p class="ui-tryout-running" role="status">
-              Running — a run takes a minute or more ({elapsed}s so far).
+              Running — a run takes a minute or more, and up to half an hour for
+              a long list ({elapsed}s so far).
             </p>
           ) : null}
           {error ? (

frontend/packages/swarm-ui/src/pages/review-tryout/TryOutTypes.ts

@@ -50,10 +50,15 @@ export interface TryOutResult {
   error?: string;
 }
 
-const REPO = /^[^/\s]+\/[^/\s]+$/;
+// Characters the endpoint accepts in each half of a repo: letters, digits, `.`,
+// `_` and `-`, other than `.` and `..` themselves.
+const SEGMENT = /^(?!\.{1,2}$)[A-Za-z0-9._-]+$/;
 
 export function repoProblem(repo: string): string | null {
-  return REPO.test(repo.trim()) ? null : "a repo is owner/name";
+  const parts = repo.trim().split("/");
+  return parts.length === 2 && parts.every((p) => SEGMENT.test(p))
+    ? null
+    : "a repo is owner/name, with letters, digits, . _ and - in each part";
 }
 
 export function prNumber(pr: string): number | null {