Fix Gitea wrapper login resolution (#538)

packages/mosaic/framework/tools/git/pr-create.sh

@@ -56,6 +56,7 @@ PY
 
     url="https://${host}/api/v1/repos/${repo}/pulls"
     curl -fsS -X POST \
+      -H "User-Agent: curl/8" \
       -H "Authorization: token ${token}" \
       -H "Content-Type: application/json" \
       -d "$payload" \
@@ -177,7 +178,12 @@ case "$PLATFORM" in
         # is unreliable in Mosaic worktrees/profile shells. Use arrays instead
         # of eval so markdown backticks/body content are not shell-executed.
         REPO_SLUG=$(get_repo_slug)
-        REPO_ARGS=(--repo "$REPO_SLUG" --login "${GITEA_LOGIN:-mosaicstack}")
+        GITEA_LOGIN_NAME=$(get_gitea_login) || {
+            echo "Warning: could not resolve Gitea login for tea; trying Gitea API fallback..." >&2
+            gitea_pr_create_api
+            exit $?
+        }
+        REPO_ARGS=(--repo "$REPO_SLUG" --login "$GITEA_LOGIN_NAME")
         CMD=(tea pr create "${REPO_ARGS[@]}" --title "$TITLE")
         [[ -n "$BODY" ]] && CMD+=(--description "$BODY")
         [[ -n "$BASE_BRANCH" ]] && CMD+=(--base "$BASE_BRANCH")