feat: add CronDeleteDialog component and integrate it into CronPage for job deletion

- Implemented a new CronDeleteDialog component for confirming job deletions.
- Integrated the CronDeleteDialog into the CronPage, allowing users to delete cron jobs with confirmation.
- Refactored job deletion logic to handle state updates and loading indicators during deletion.
- Removed unused delivery channel related code from CronPage and CronTaskDialog.
- Cleaned up chat store session deletion logic to improve state management and ensure proper session handling.

src/stores/chat.ts

@@ -656,31 +656,32 @@ function selectAgent(agentId: string): void {
 }
 
 async function deleteSession(sessionKey: string): Promise<void> {
-  if (sessionKey === state.currentSessionKey) {
+  const currentState = state;
+  const isDeletingCurrentSession = sessionKey === currentState.currentSessionKey;
+
+  if (isDeletingCurrentSession) {
     resetPendingStreamingDelta();
   }
 
-  try {
-    await gatewayRpc('session.delete', { sessionKey });
-  } catch {
-    // keep local cleanup even if gateway delete fails
-  }
+  historyLoadInFlight.delete(sessionKey);
+  lastHistoryLoadAtBySession.delete(sessionKey);
 
-  const remaining = state.sessions.filter((session) => session.key !== sessionKey);
+  const remaining = currentState.sessions.filter((session) => session.key !== sessionKey);
   const basePatch: Partial<ChatStoreState> = {
     sessions: remaining,
-    sessionLabels: clearSessionEntryFromMap(state.sessionLabels, sessionKey),
-    sessionLastActivity: clearSessionEntryFromMap(state.sessionLastActivity, sessionKey),
+    sessionLabels: clearSessionEntryFromMap(currentState.sessionLabels, sessionKey),
+    sessionLastActivity: clearSessionEntryFromMap(currentState.sessionLastActivity, sessionKey),
   };
 
-  if (state.currentSessionKey === sessionKey) {
-    const nextSession = remaining[0]?.key ?? getDefaultMainSessionKey();
-    const hasRemainingSessions = remaining.length > 0;
+  if (isDeletingCurrentSession) {
+    const nextAgentId = getAgentIdFromSessionKey(sessionKey);
     patchState({
       ...basePatch,
-      currentSessionKey: nextSession,
-      currentAgentId: getAgentIdFromSessionKey(nextSession),
+      currentSessionKey: buildNewSessionKey(nextAgentId),
+      currentAgentId: nextAgentId,
       messages: [],
+      loading: false,
+      sending: false,
       streamingMessage: null,
       streamingTools: [],
       activeRunId: null,
@@ -688,14 +689,15 @@ async function deleteSession(sessionKey: string): Promise<void> {
       pendingFinal: false,
       lastUserMessageAt: null,
     });
-
-    if (hasRemainingSessions && nextSession) {
-      await loadHistory(nextSession);
-    }
-    return;
+  } else {
+    patchState(basePatch);
   }
 
-  patchState(basePatch);
+  try {
+    await gatewayRpc('session.delete', { sessionKey });
+  } catch {
+    // keep local cleanup even if gateway delete fails
+  }
 }
 
 function renameSession(sessionKey: string, nextLabel: string): void {