fix(network): prevent QQuickRepeater model-swap crash

[OmarTahon]

Fixes #91

Root cause

NetworkPopup.qml changes the live orbitRepeater.model identity between infoListModel, wifiListModel, btListModel, and null. Network mode can also change from Process completion callbacks. That re-evaluates the model binding and reaches the same native path reported in #91:

Process::onFinished()
StdioCollector::streamFinished()
QQuickRepeater::setModel()
QQuickRepeater::clear()
SIGSEGV

Changes

• add a permanent orbitDisplayModel;
• keep orbitRepeater.model bound to that model for its lifetime;
• mirror Wi-Fi/Bluetooth/info contents into the presentation model;
• refresh presentation contents on mode/info-view changes;
• use a formal onExited: function(exitCode, exitStatus) handler;
• qualify the child-scope isHighlighted / locksList references through floatCard.

Validation

Independently reproduced on Arch Linux + Hyprland with Quickshell 0.3.0 and Qt 6.11.1.

After the patch:

• repeated Bluetooth/Wi-Fi/info-view switching survived;
• repeated workspace-button switching survived;
• exactly one bar remained;
• no new SIGSEGV;
• no new coredump;
• no new ReferenceError/TypeError from the tested path.