Prioritize camera_entity over SIP video stream when both configured

[Copilot]

When sip_video is enabled and camera_entity is configured for an extension, the SIP video stream was displayed instead of the camera entity. This changes the priority so camera_entity takes precedence.

Changes

Modified display logic in sip-call-dialog.ts and sip-call-card.ts:

• Remove remoteVideoStream === null condition when checking for camera_entity
• Hide <video> element when camera_entity is present: remoteVideoStream === null || camera
• Clean up audioVisualizer when camera or video is displayed

Before:

if (
    sipCore.callState !== CALLSTATE.IDLE &&
    sipCore.remoteExtension !== null &&
    sipCore.remoteVideoStream === null  // Only check camera when no video
) {
    camera = this.config.extensions[sipCore.remoteExtension]?.camera_entity || "";
}

After:

if (
    sipCore.callState !== CALLSTATE.IDLE &&
    sipCore.remoteExtension !== null  // Check camera regardless of video stream
) {
    camera = this.config.extensions[sipCore.remoteExtension]?.camera_entity || "";
    if (!camera && sipCore.remoteVideoStream === null) {
        // Only show audio visualizer when no camera AND no video
    } else {
        this.audioVisualizer = undefined;  // Cleanup when camera/video present
    }
}

Display priority is now: camera_entity → SIP video → audio visualizer

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[TECH7Fox]

Fixes #181