Add scroll constraints to SQL query text editor

[Copilot]

SQL query text editor grows unbounded, pushing "Valideren" and "Uitvoeren" buttons off-screen for queries exceeding viewport height.

Changes

Added height constraint and auto-scroll to all avalonEdit:TextEditor instances across 11 view files:

<!-- Before -->
<avalonEdit:TextEditor FontSize="20" MinHeight="100">

<!-- After -->
<avalonEdit:TextEditor FontSize="20" MinHeight="100" MaxHeight="250" VerticalScrollBarVisibility="Auto">

Affected views:

• Puzzles: AdventurerView, StudentView, ButtonView, BattleshipView
• Select: SelectView, FilterView, JoinView, WildcardView, SortView, GroupView, AggregateView

MaxHeight of 250px allows ~10 lines at FontSize 20 before scrollbar activates.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>new Scroll feature</issue_title>
<issue_description>als je een te grote query van boven naar beneden maakt krijg je geen scroll optie maar wordt het tekst veld groter en verdwijnt de valideren knop.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes new Scroll feature #21

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