fix(task): reset isStreaming state in abortTask to prevent UI lock after task switch

When a task switch occurs via abortTask() (e.g., removeClineFromStack,
clearTask), the isStreaming flag was not being reset. This left the chat
input locked in 'API Request...' state because ClineProvider checks
getCurrentTask()!.isStreaming to determine if the UI should be enabled.

Added isStreaming=false and isWaitingForFirstChunk=false reset in
abortTask() alongside the existing abort=true flag, ensuring the UI
unlocks immediately when a task is aborted or abandoned.

Fixes #257

Author: proyectoauraorg

src/core/task/Task.ts

@@ -2118,6 +2118,13 @@ export class Task extends EventEmitter<TaskEvents> implements TaskLike {
 
 		this.abort = true
 
+		// Reset streaming state so the UI unlocks immediately.
+		// Without this, task switches that call abortTask() without going
+		// through resumeAfterDelegation() leave isStreaming=true, causing
+		// the chat input to remain locked (issue #257).
+		this.isStreaming = false
+		this.isWaitingForFirstChunk = false
+
 		// Reset consecutive error counters on abort (manual intervention)
 		this.consecutiveNoToolUseCount = 0
 		this.consecutiveNoAssistantMessagesCount = 0