Refactor frontend components and enhance API integration

- Updated frontend-nuxt.mdc to specify usage of composables for API calls.
- Added new AuthCard and ConfirmModal components for improved UI consistency.
- Introduced UserAvatar component for user profile display, replacing previous Gravatar implementation.
- Implemented useFormSubmit composable for handling form submissions with loading and error states.
- Enhanced vitest.config.ts to include coverage reporting for composables and components.
- Removed deprecated useAdminApi and useAuth composables to streamline API interactions.
- Updated login and setup pages to utilize new components and composables for better user experience.

internal/app/handlers/client.go

@@ -24,7 +24,7 @@ func (h *Handlers) ClientRouter(rw http.ResponseWriter, req *http.Request) {
 	ctx := req.Context()
 	username, err := h.Auth.ValidateClientToken(ctx, matches[1])
 	if err != nil {
-		rw.WriteHeader(http.StatusUnauthorized)
+		HandleServiceError(rw, err)
 		return
 	}
 	ctx = context.WithValue(ctx, app.ClientUsernameKey, username)
@@ -47,10 +47,10 @@ func (h *Handlers) ClientRouter(rw http.ResponseWriter, req *http.Request) {
 		if req.FormValue("version") == app.ClientVersion {
 			rw.WriteHeader(http.StatusOK)
 		} else {
-			rw.WriteHeader(http.StatusBadRequest)
+			JSONError(rw, http.StatusBadRequest, "version mismatch", "BAD_REQUEST")
 		}
 	default:
-		rw.WriteHeader(http.StatusNotFound)
+		JSONError(rw, http.StatusNotFound, "not found", "NOT_FOUND")
 	}
 }
 
@@ -58,9 +58,11 @@ func (h *Handlers) clientLocate(rw http.ResponseWriter, req *http.Request) {
 	gridID := req.FormValue("gridID")
 	result, err := h.Client.Locate(req.Context(), gridID)
 	if err != nil {
-		rw.WriteHeader(http.StatusNotFound)
+		HandleServiceError(rw, err)
 		return
 	}
+	rw.Header().Set("Content-Type", "text/plain")
+	rw.WriteHeader(http.StatusOK)
 	rw.Write([]byte(result))
 }
 
@@ -75,8 +77,11 @@ func (h *Handlers) clientGridUpdate(rw http.ResponseWriter, req *http.Request) {
 	result, err := h.Client.ProcessGridUpdate(req.Context(), grup)
 	if err != nil {
 		slog.Error("grid update failed", "error", err)
+		HandleServiceError(rw, err)
 		return
 	}
+	rw.Header().Set("Content-Type", "application/json")
+	rw.WriteHeader(http.StatusOK)
 	json.NewEncoder(rw).Encode(result.Response)
 }
 
@@ -87,6 +92,7 @@ func (h *Handlers) clientGridUpload(rw http.ResponseWriter, req *http.Request) {
 	}
 	if err := req.ParseMultipartForm(app.MultipartMaxMemory); err != nil {
 		slog.Error("multipart parse error", "error", err)
+		JSONError(rw, http.StatusBadRequest, "invalid multipart", "BAD_REQUEST")
 		return
 	}
 	id := req.FormValue("id")
@@ -94,11 +100,13 @@ func (h *Handlers) clientGridUpload(rw http.ResponseWriter, req *http.Request) {
 	file, _, err := req.FormFile("file")
 	if err != nil {
 		slog.Error("form file error", "error", err)
+		JSONError(rw, http.StatusBadRequest, "missing file", "BAD_REQUEST")
 		return
 	}
 	defer file.Close()
 	if err := h.Client.ProcessGridUpload(req.Context(), id, extraData, file); err != nil {
 		slog.Error("grid upload failed", "error", err)
+		HandleServiceError(rw, err)
 	}
 }
 
@@ -107,10 +115,12 @@ func (h *Handlers) clientPositionUpdate(rw http.ResponseWriter, req *http.Reques
 	buf, err := io.ReadAll(req.Body)
 	if err != nil {
 		slog.Error("error reading position update", "error", err)
+		JSONError(rw, http.StatusBadRequest, "failed to read body", "BAD_REQUEST")
 		return
 	}
 	if err := h.Client.UpdatePositions(req.Context(), buf); err != nil {
 		slog.Error("position update failed", "error", err)
+		HandleServiceError(rw, err)
 	}
 }
 
@@ -119,9 +129,11 @@ func (h *Handlers) clientMarkerUpdate(rw http.ResponseWriter, req *http.Request)
 	buf, err := io.ReadAll(req.Body)
 	if err != nil {
 		slog.Error("error reading marker update", "error", err)
+		JSONError(rw, http.StatusBadRequest, "failed to read body", "BAD_REQUEST")
 		return
 	}
 	if err := h.Client.UploadMarkers(req.Context(), buf); err != nil {
 		slog.Error("marker update failed", "error", err)
+		HandleServiceError(rw, err)
 	}
 }