case-create: surface Gitea repo result + UI retry button

The auto-creation in case_create had two failure modes that combined to
make repos silently missing: a stale GITEA_TOKEN returning 401, and the
outer try/except in case_create that swallowed every exception with a
bare pass. Result: cases like 8174-24 ended up with a local git repo and
Paperclip project but no Gitea repo, with no signal anywhere.

_setup_gitea_remote now returns {ok, url, error} and never raises; the
result is attached to the case JSON and the FastAPI endpoint logs a
warning when ok=false. The UI gets a "צור ריפו ב-Gitea" button on the
case header that appears only when the repo or remote is missing.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

web-ui/src/lib/api/cases.ts

@@ -217,6 +217,30 @@ export function useGitStatus(caseNumber: string | undefined) {
   });
 }
 
+export type CreateGiteaRepoResult = {
+  repo_url: string;
+  clone_url: string;
+  pushed: boolean;
+};
+
+export function useCreateGiteaRepo(caseNumber: string | undefined) {
+  const qc = useQueryClient();
+  return useMutation({
+    mutationFn: (input: { title: string; description?: string }) =>
+      apiRequest<CreateGiteaRepoResult>(`/api/integrations/gitea/create-repo`, {
+        method: "POST",
+        body: {
+          case_number: caseNumber,
+          title: input.title,
+          description: input.description ?? "",
+        },
+      }),
+    onSuccess: () => {
+      qc.invalidateQueries({ queryKey: [...casesKeys.all, "git-status", caseNumber ?? ""] });
+    },
+  });
+}
+
 export type StartWorkflowResult = {
   case_number: string;
   status: string;