fix(concurrency): namespace temp filenames to avoid cross-conversation clashes

Two parallel conversations could collide on shared temp filenames:
- image-handler: temp_image_<ms> -> add a crypto.randomUUID() suffix
- diagnosticsHandler: zoo-diagnostics-<taskId8>-<ms> -> use the full task id
  plus a random hex suffix

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: allquixotic

src/core/webview/diagnosticsHandler.ts

@@ -1,6 +1,7 @@
 import * as path from "path"
 import * as os from "os"
 import * as fs from "fs/promises"
+import * as crypto from "crypto"
 import * as vscode from "vscode"
 
 import { getTaskDirectoryPath } from "../../utils/storage"
@@ -73,7 +74,10 @@ export async function generateErrorDiagnostics(params: GenerateDiagnosticsParams
 		// Create a temporary diagnostics file
 		const tmpDir = os.tmpdir()
 		const timestamp = Date.now()
-		const tempFileName = `zoo-diagnostics-${taskId.slice(0, 8)}-${timestamp}.json`
+		// Use the full task id plus a short random suffix so two diagnostics dumps for
+		// the same (or a same-8-char-prefix) task in the same millisecond can't collide
+		// across concurrent conversations.
+		const tempFileName = `zoo-diagnostics-${taskId}-${timestamp}-${crypto.randomBytes(4).toString("hex")}.json`
 		const tempFilePath = path.join(tmpDir, tempFileName)
 
 		await fs.writeFile(tempFilePath, fullContent, "utf8")

src/integrations/misc/image-handler.ts

@@ -1,5 +1,6 @@
 import * as path from "path"
 import * as os from "os"
+import * as crypto from "crypto"
 import * as vscode from "vscode"
 import { getWorkspacePath } from "../../utils/path"
 import { t } from "../../i18n"
@@ -52,7 +53,9 @@ export async function openImage(dataUriOrPath: string, options?: { values?: { ac
 	const imageBuffer = Buffer.from(base64Data, "base64")
 
 	// Default behavior: open the image
-	const tempFilePath = path.join(os.tmpdir(), `temp_image_${Date.now()}.${format}`)
+	// Include a random suffix so concurrent conversations saving images in the same
+	// millisecond don't collide on the temp filename.
+	const tempFilePath = path.join(os.tmpdir(), `temp_image_${Date.now()}_${crypto.randomUUID()}.${format}`)
 	try {
 		await vscode.workspace.fs.writeFile(vscode.Uri.file(tempFilePath), imageBuffer)
 		// Check if this is a copy action