fix(datagrid): Esc in the filter suggestions or a search field no longer exits fullscreen (#1403)

[datlechin]

What

In macOS fullscreen, pressing Esc to dismiss the Raw SQL filter's autocomplete popup also exited fullscreen. Closes #1403. The same leak affected search fields. Esc now stays in fullscreen.

Root cause

The Esc key (cancelOperation:) reached SwiftUI's NSHostingView, which exits fullscreen on an unhandled exit command. The trace:

NSTextView.keyDown -> interpretKeyEvents -> doCommandBySelector(cancelOperation:)
  -> SwiftUI NSHostingView.doCommand(by:) -> _NSFullScreenSpace exit transition

So the exit happens at the SwiftUI hosting layer, not at the window. Standard window fullscreen is not exited by Esc natively; that is the green button or Ctrl+Cmd+F. The exit here was NSHostingView reacting to an unconsumed exit command.

Two text fields let Esc through to the hosting view:

• The Raw SQL filter's suggestion monitor handled Esc but returned the event instead of consuming it.
• NativeSearchField returned false from its delegate when the field was empty, so Esc propagated.

Fix

Consume cancelOperation: at the text field's delegate (control(_:textView:doCommandBy:) returning true), so it never reaches NSHostingView. This is the same mechanism NativeSearchField already used for the non-empty case (clearing a search without exiting fullscreen).

• FilterValueTextField: the delegate now consumes Esc, dismissing the suggestion popup if it is shown. The popup monitor also consumes Esc instead of passing it through. Extracted a pure, testable suggestionKeyOutcome(for:submitsOnAccept:).
• NativeSearchField: an empty-field Esc is now consumed instead of propagating.

Tests

FilterValueTextFieldTests asserts escape -> .dismiss (a consuming outcome) plus the arrow/return/tab/pass-through mappings.

Verify (in fullscreen)

• Raw SQL filter: type a value to open the popup, Esc closes the popup and stays fullscreen. Esc again with no popup stays fullscreen.
• Search field: Esc with text clears it and stays fullscreen; Esc on an empty field stays fullscreen.
• Regression: green button and Ctrl+Cmd+F still exit fullscreen.

Scope

This consumes Esc in the filter and search fields (the reported case and the related search-field case). Any other SwiftUI-hosted text field would use the same one-line delegate consume.