auto-size the operations panel to its rows, capped at 3

[Gabriel Dufresne (GabrielDuf)]

This pull request improves the behavior and user experience of the operations panel in the main window by making its size more responsive and preserving user adjustments. The main changes include tracking when the user resizes the panel, automatically sizing the panel based on its content, and updating the UI more reliably when operations change.

Operations panel resizing and auto-sizing improvements:

• The panel now tracks whether the user has manually resized it (_userResizedPanel), and only auto-sizes if the user hasn't adjusted it.
• Introduced a method to automatically compute the panel's height based on the number and size of operation items, for a better default experience.
• The minimum height for the operations panel was reduced from 80px to 48px for improved layout flexibility.

UI event handling and state management:

• The code now listens for changes in the operations collection and splitter drag events to update the panel size and track user interaction, ensuring the panel responds correctly to content and user actions.
• The grid splitter is now named (OperationsSplitter) for event hookup, and relevant event handlers are added to manage resizing logic.

[Copilot]

Pull request overview

Makes the operations panel auto-size to three rows while preserving manual resizing.

Changes:

• Computes panel height from visible operation rows.
• Tracks collection and splitter events.
• Reduces minimum panel height and names the splitter.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
MainWindow.axaml.cs	Adds auto-sizing and resize-state logic.
MainWindow.axaml	Names the operations splitter.

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