Table selection inconsistently replaces tab vs opens a new tab

[datlechin]

What happened?

The first table selection replaces the current window content. After a second tab is added, every later table selection opens a new tab instead of replacing the active one. The behavior should be predictable.

Steps to reproduce

1. Open a connection, click a table (replaces current window)
2. Add a new tab
3. Click another table
4. It opens yet another new tab instead of replacing the active tab

Expected behavior

Table selection follows one consistent rule. Single-click reuses/replaces the active tab (preview style); only an explicit action opens a new tab.

Code pointer

TablePro/Views/Main/Extensions/MainContentCoordinator+Navigation.swift openTableTab. The preview-vs-new-tab branch changes after the first extra tab is created. See the tab replacement guard noted in CLAUDE.md.

Database type

N/A