fix: add user-facing notification when delegation guards drop actions

Addresses review feedback: showTaskWithId, deleteTaskWithId, and cancelTask
now show an informational message when skipped during delegation, instead of
silently dropping the user action with only a log call.

Author: hannesrudolph

src/core/webview/ClineProvider.ts

@@ -1817,6 +1817,7 @@ export class ClineProvider
 	async showTaskWithId(id: string) {
 		if (this.delegationInProgress) {
 			this.log("[showTaskWithId] Skipped: delegation in progress")
+			vscode.window.showInformationMessage("Task delegation in progress, please wait...")
 			return
 		}
 		if (id !== this.getCurrentTask()?.taskId) {
@@ -1864,6 +1865,7 @@ export class ClineProvider
 		try {
 			if (this.delegationInProgress) {
 				this.log("[deleteTaskWithId] Skipped: delegation in progress")
+				vscode.window.showInformationMessage("Task delegation in progress, please wait...")
 				return
 			}
 			// get the task directory full path and history item
@@ -3092,6 +3094,7 @@ export class ClineProvider
 	public async cancelTask(): Promise<void> {
 		if (this.delegationInProgress) {
 			this.log("[cancelTask] Skipped: delegation in progress")
+			vscode.window.showInformationMessage("Task delegation in progress, please wait...")
 			return
 		}
 		const task = this.getCurrentTask()