test(iOS): isolate preview-text reconfigure route

[teamleaderleo]

Fixes #13563.

previewTextChangeReconfiguresInPlaceWithoutTableReload() was mutating both previewText and hasUnread, while the coordinator intentionally treats hasUnread transitions as native-action payload changes that take the table-reload path.

This removes only the unrelated unread mutation so the test exercises the route named by the test: a preview-text-only payload change should reconfigure the visible row in place. Unread/native-action behavior remains covered by workspaceReloadsNativeActionsWhenReadStateChanges().

Evidence:

• failing iPhone run: https://github.com/manaflow-ai/cmux/actions/runs/35682638589
• failure observed .tableReload while this test expected .reconfiguredInPlace(["workspace.workspace-1"])
• a later unchanged-iOS main run passed, exposing the test as nondeterministic/conflicted with the explicit unread reload contract
• current main already classifies Packages/iOS/CmuxMobileShellUI/Tests/** as macOS-neutral, so this test-only PR should stay off the generic macOS compile route

Focused simulator verification can use:

gh workflow run test-ios.yml \
  --ref main \
  -f ref=0e3aef9679783e09065a6a7b2b4a6ad96d24e4e4 \
  -f test_filter=CmuxMobileShellUITests/WorkspaceListScrollUpdateTests \
  -f device_family=iphone \
  -f runner=auto

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Summary by cubic

Fixes #13563.

previewTextChangeReconfiguresInPlaceWithoutTableReload() was mutating both previewText and hasUnread, but the coordinator treats unread transitions as native-action changes that force a table reload. This removes only the unrelated unread mutation so the test exercises the preview-text-only route, which should reconfigure the row in place.

• Unread/native-action behavior remains covered by workspaceReloadsNativeActionsWhenReadStateChanges().

^{Written for commit 0e3aef9. Summary will update on new commits.}

Summary by CodeRabbit

• Tests
  • Updated workspace list coverage to verify that preview text changes are applied in place without reloading the table.

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• Packages/iOS/CmuxMobileShellUI/Tests/CmuxMobileShellUITests/WorkspaceListScrollUpdateTests.swift

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[teamleaderleo]

Closing as superseded by #13607, which already landed the exact preview-text-only test fix plus the macOS-neutral routing carve-out on main (9c59b5914b19ec2f9146df14aed1489f4535679c). This PR now has an empty effective diff, which is why CI failed open and queued every area.