fix(android): extract PendingDialogs from AdminUsersScreen (detekt LongMethod)

AdminUsersScreen body was 65 lines vs the 60 cap because both
dialogs were rendered inline. Pulled them into a single
PendingDialogs helper that takes the two nullable selections + the
clear/confirm callbacks. AdminUsersScreen is back to ~45 lines and
PendingDialogs is ~30.

File function count is still 8 (Screen + UserList + UserRow +
ToggleRow + PendingDialogs + ResetPasswordDialog + DeleteConfirmDialog
+ LoadingCentered), under the 11 cap.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

android/app/src/main/java/com/fabledsword/minstrel/admin/ui/AdminUsersScreen.kt

@@ -95,24 +95,42 @@ fun AdminUsersScreen(
         }
     }
 
+    PendingDialogs(
+        resetPasswordFor = resetPasswordFor,
+        deleteCandidate = deleteCandidate,
+        onClearReset = { resetPasswordFor = null },
+        onClearDelete = { deleteCandidate = null },
+        onConfirmReset = viewModel::resetPassword,
+        onConfirmDelete = viewModel::delete,
+    )
+}
+
+@Composable
+private fun PendingDialogs(
+    resetPasswordFor: AdminUserRef?,
+    deleteCandidate: AdminUserRef?,
+    onClearReset: () -> Unit,
+    onClearDelete: () -> Unit,
+    onConfirmReset: (String, String) -> Unit,
+    onConfirmDelete: (String) -> Unit,
+) {
     resetPasswordFor?.let { user ->
         ResetPasswordDialog(
             user = user,
-            onDismiss = { resetPasswordFor = null },
+            onDismiss = onClearReset,
             onConfirm = { newPassword ->
-                viewModel.resetPassword(user.id, newPassword)
-                resetPasswordFor = null
+                onConfirmReset(user.id, newPassword)
+                onClearReset()
             },
         )
     }
-
     deleteCandidate?.let { user ->
         DeleteConfirmDialog(
             user = user,
-            onDismiss = { deleteCandidate = null },
+            onDismiss = onClearDelete,
             onConfirm = {
-                viewModel.delete(user.id)
-                deleteCandidate = null
+                onConfirmDelete(user.id)
+                onClearDelete()
             },
         )
     }