Delete confirmation input retains previously entered name after cancelling

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**Description**

When deleting a workspace or account, the user is required to type the account name to confirm deletion. If the user cancels the dialog and reopens it later, the confirmation input field still contains the previously typed name instead of being empty.

**Environment**
Staging

**Application (+ app version, build, operating system)**
Mergin Maps Mobile App
- Android: 2026.3.2 / Samsung Galaxy A53 5G, Android 16
- iOS: 2026.3.2 / iOS 26.0

**Steps to reproduce**
1. Open account settings
2. Tap **Close account**
3. Type the account name in the confirmation input
4. Tap **Cancel** (do not confirm deletion)
5. Reopen the delete dialog

**Actual results**
The confirmation input field still contains the name entered in step 3.

**Expected results**
The confirmation input field should be empty each time the delete dialog is opened.

*Conclusion*
*Created by Claude and supervised by a human test analyst.*

Start by locating the close-account or delete-confirmation dialog in the mobile app and reproduce the cancel-and-reopen sequence on the affected platforms. Trace where the confirmation input value is retained, then verify that reopening the dialog shows an empty field after cancellation.

Written by the indexing model from the issue text.