fix failing test conversation - should respect auto-assign preference when replying (#1068)

ref #1064 
# Related Test

<img width="939" height="240" alt="Screenshot 2025-10-15 at 5 54 19 PM"
src="https://github.com/user-attachments/assets/a148a87b-66cf-48f9-9003-ede24e16e60b"
/>

# Problem 

Previously, we checked for `Auto-Assign on Reply` by locating the
`Assign yourself` button. However, it seems that this specific element
is always present even when the conversation is already assigned to the
user.
This change was introduced by devin #1057 

### Video-proof : 
 


https://github.com/user-attachments/assets/5ab64d57-2738-4269-97a0-8d0c895f7546

# Solution 
Instead of checking if `Assign yourself` button is present or not, we
check if the assignee is user or not.

### Test passing screen shot 

<img width="1901" height="1001" alt="Screenshot 2025-10-15 at 4 17
49 PM"
src="https://github.com/user-attachments/assets/51eaa6ed-7133-4b52-a29c-cdfb8624f5b6"
/>

Link to upstream CI action passing all test suites:

<img width="649" height="173" alt="Screenshot 2025-10-15 at 5 49 41 PM"
src="https://github.com/user-attachments/assets/33fb16d2-0bbd-4c19-a351-608ed650d2e1"
/>


https://github.com/stefanbinoj/helper/actions/runs/18527904075/job/52802976944



## AI Usage : 
No AI was used in the creation of this PR.

## Self Review : 
I have self reviewed all codes that i have written.

---------

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
Co-authored-by: Jono M <[email protected]>

Author: 3 people

tests/e2e/conversations/conversationActions.spec.ts

@@ -317,7 +317,7 @@ test.describe("Conversation Actions", () => {
 
       await sendReplyMessage(page, "Auto-assign off test reply message");
 
-      await expect(page.getByRole("button", { name: "Assign yourself" })).toBeVisible();
+      await expect(page.getByRole("button", { name: "Unassigned" })).toBeVisible();
 
       await page.goto("/settings/preferences");
       await page.locator('[aria-label="Auto-assign on reply Switch"]').click();
@@ -328,7 +328,7 @@ test.describe("Conversation Actions", () => {
 
       await sendReplyMessage(page, "Auto-assign on test reply message");
       await expect(page.getByTestId("message-thread")).toContainText("Auto-assign on test reply message");
-      await expect(page.getByRole("button", { name: "Assign yourself" })).not.toBeVisible();
+      await expect(page.getByRole("button", { name: "[email protected]" })).toBeVisible();
     });
   });
 });