fix(ui): use dedicated configSaveError state instead of global lastError

- Add configSaveError field to ChannelsState and AppViewState
- Clear configSaveError before save/reload operations
- Set configSaveError only when config save fails
- Fixes Codex P2 feedback about global error pollution
- Channel config callouts now only show save-specific errors

ui/src/ui/app-channels.ts

@@ -25,12 +25,17 @@ export async function handleWhatsAppLogout(host: OpenClawApp) {
 }
 
 export async function handleChannelConfigSave(host: OpenClawApp) {
+  host.configSaveError = null;
   await saveConfig(host);
+  if (host.lastError) {
+    host.configSaveError = host.lastError;
+  }
   await loadConfig(host);
   await loadChannels(host, true);
 }
 
 export async function handleChannelConfigReload(host: OpenClawApp) {
+  host.configSaveError = null;
   await loadConfig(host);
   await loadChannels(host, true);
 }

ui/src/ui/app-render.ts

@@ -680,7 +680,7 @@ export function renderApp(state: AppViewState) {
                   configUiHints: state.configUiHints,
                   configSaving: state.configSaving,
                   configFormDirty: state.configFormDirty,
-                  configSaveError: state.lastError,
+                  configSaveError: state.configSaveError,
                   nostrProfileFormState: state.nostrProfileFormState,
                   nostrProfileAccountId: state.nostrProfileAccountId,
                   onRefresh: (probe) => loadChannels(state, probe),

ui/src/ui/app-view-state.ts

@@ -145,6 +145,7 @@ export type AppViewState = {
   channelsSnapshot: ChannelsStatusSnapshot | null;
   channelsError: string | null;
   channelsLastSuccess: number | null;
+  configSaveError: string | null;
   whatsappLoginMessage: string | null;
   whatsappLoginQrDataUrl: string | null;
   whatsappLoginConnected: boolean | null;

ui/src/ui/app.ts

@@ -240,6 +240,7 @@ export class OpenClawApp extends LitElement {
   @state() channelsSnapshot: ChannelsStatusSnapshot | null = null;
   @state() channelsError: string | null = null;
   @state() channelsLastSuccess: number | null = null;
+  @state() configSaveError: string | null = null;
   @state() whatsappLoginMessage: string | null = null;
   @state() whatsappLoginQrDataUrl: string | null = null;
   @state() whatsappLoginConnected: boolean | null = null;

ui/src/ui/controllers/channels.types.ts

@@ -12,4 +12,5 @@ export type ChannelsState = {
   whatsappLoginQrDataUrl: string | null;
   whatsappLoginConnected: boolean | null;
   whatsappBusy: boolean;
+  configSaveError: string | null;
 };