ListView component with multi-row selection

[seventil]

Adds a ListView component (plus ListViewHeader, ListViewDelegate, and ListViewTextInput) as a styled QtQuick ListView replacement for the existing TableView components. Column widths are managed at the ListView level via columnWidths (fixed px or -1 flex) and propagated to the header and delegates, avoiding the timer-based header label measurement of the previous approach.

The public API exposes flags to control behaviour without needing to subclass: multiSelection enables Ctrl/Shift modifier-based range and toggle selection on top of plain single-click; selectOnEdit (default false) keeps cell editing orthogonal to row selection — clicking into an inline editor never selects the row, with true restoring the legacy auto-select-on-edit behaviour. Scrollbar appearance is fully consumer-controlled via scrollBarPolicy (accepts ScrollBar.Policy directly — no custom enum) and scrollBarInteractive, which together cover indicator-style, always-on draggable, and fully hidden modes from a single ScrollBar attachment. Additional knobs: tallRows, maxRowCountShow, defaultInfoText, selectionActive, and clearSelection().

[seventil]

The selection stays even outside the focus and I haven't made up my mind on what to do with that. Many such tables with many selections and its tiring. Maybe the user should clear selections from the buttons that are supposed to read the listview, calling the clearSelection() method.

[seventil]

I'll have to wait for the scrollbars to merge to see how well the final version of this ListView works

[seventil]

The issue I ran into during development: selected rows look fine with default label colorl but absolutely horrendous with disabled or recently-selected markings

Potential fix is to have separate text selection colors, but thats a lot. The other potential fix is to have less difference in selection from regular background color. I'll have to think about that.

[codecov]

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