feat: add HiliteContainer sysObject type with hover border and right-click context menu

[Copilot]

Adds a new HiliteContainer sysObject that visually wraps one (singular) or multiple hierarchical (plural) child objects — drawing a border on hover and exposing a right-click context menu for actions like edit, move hierarchy, or any user-defined operation.

New file: www/sysObjHiliteContainer.js

• Inherits sysBaseObject; registered as "HiliteContainer" in sysFactory.SetupClasses
• mouseenter/mouseleave toggle sysHiliteContainerBorder CSS class for hover highlight
• mousedown (button 2) opens sysContextMenu using the same pattern as sysObjList
• Wraps sysContextMenu.close() to reset ContextMenuOpen state and clean up the border correctly after menu dismissal
• Optional label child rendered when TextID is set
• RuntimeGetDataFunc/RuntimeSetDataFunc stubs so all standard context-menu internal functions resolve without errors

CSS (www/static/globalstyles.css)

• .sysHiliteContainerRoot — base wrapper with transparent border for smooth CSS transition
• .sysHiliteContainerBorder — blue border + glow applied on hover
• .sysHiliteContainerLabel — compact header label style

Docs

• appdev-objects.rst: new section 10.13 with attribute table, features, and singular/plural JSON examples; old 10.13 renumbered to 10.14
• appdev-context-menu.rst: note updated to include HiliteContainer as a supported type

Usage example

"HiliteGroup1": {
    "Type": "HiliteContainer",
    "Attributes": {
        "Mode": "plural",
        "TextID": "TXT.MY.GROUP.LABEL",
        "ContextMenuItems": [
            {
                "ID": "edit",
                "TextID": "TXT.EDIT",
                "IconStyle": "fa-solid fa-pen",
                "InternalFunction": "openOverlay",
                "ScreenOverlayID": "EditOverlay",
                "ScreenOverlaySetDataObjects": []
            }
        ]
    },
    "Objects": {
        "ChildA": { "Type": "Div", "Attributes": { "Style": "p-1" } },
        "ChildB": { "Type": "SQLText", "Attributes": { "TextID": "TXT.CHILD.B" } }
    }
}