Remove duplicate KService include in favouritesmodel.cpp. Add
keyboard navigation and accessibility role to CategoryPanel
tiles. Clamp the FavouritesBar thumbnail popup position to
screen bounds so it does not overflow offscreen on edge items.
ApplicationListSearchModel: beginFilterChange() was called after
mutating m_categoryFilter, inverting the documented before/after
contract. Also add null checks for sourceModel() and
favouritesModel() in filterAcceptsRow.
CategoryPanel: add onModelReset to repopulate the category list
when the underlying model is fully reloaded, not just on individual
row insertions and removals.
A panel between the drawer and the power panel lists the XDG
categories installed on the device as icon-and-label tiles.
Tapping one filters the app list; text search still applies
on top. The filter resets each time the drawer opens. Audio,
Video and Settings fold into their parent groups to match
Kickoff.
