Draw the remaining Qt chrome icons through the existing generated icon
path instead of loading TinyVG resources. Add generated folder and
chevron icons for menus, the bookmarks bar, and find-in-page controls,
and use the generated globe icon for bookmarks without favicons.
Remove the Qt TinyVG icon engine and drop the unused TVG resources from
the Qt resource file.
Replace the old QCompleter-based popup with a custom list that renders
AutocompleteSuggestion rows with titles/URLs/section headers/favicons.
Parent the popup inside the window so it does not steal focus, route
keyboard and mouse activation through WebView::Autocomplete, and add
inline completion with backspace suppression and top-row selection.
