fix: advance option in start recording

[solomon17705cs]

## Problem

The "Advanced Options" section in the Start Recording dialog was hidden when transcription was disabled—even if recording capability (local) was available. This caused the section to be inaccessible in local-recording-only setups.

## Root Cause

Visibility of the entire **Advanced Options** section was gated exclusively by `_canStartTranscribing()`, which depends on:
- `transcription.enabled` in config
- JWT transcription permissions

### Root Cause Analysis

Original logic tightly coupled UI visibility to *transcription capability* instead of *recording capability*:

```javascript
// OLD CODE
if (selectedRecordingService !== RECORDING_TYPES.JITSI_REC_SERVICE 
    || !this._canStartTranscribing()) {
    return null; // Hide entire Advanced Options section
}

Solution

Decoupled section visibility from transcription capability:

// NEW CODE
const hasRecordingCapability = fileRecordingsServiceEnabled || _localRecordingAvailable;
const canStartTranscribing = this._canStartTranscribing();

// Show section if ANY capability exists (recording OR transcription)
if (!hasRecordingCapability && !canStartTranscribing) {
    return null;
}

// Conditionally render toggles within section
{canStartTranscribing && <TranscriptionToggle />}
<AudioVideoToggle /> // Always visible when section renders

Advanced Options section now appears when:

• Cloud recording is available, OR
• Local recording is available, OR
• Transcription capability exists

Toggle behavior:

• "Record transcription" toggle: Only visible when _canStartTranscribing() is true
• "Record audio and video" toggle: Always visible when section is rendered

Impact

• ✨ Fixes missing Advanced Options in local-recording-only environments
• 🔒 Preserves existing transcription permission/validation logic
• 🔄 Maintains current behavior for cloud recording (Jibri)
• 🚫 Zero breaking changes to existing workflows

Fixes

Fixes #16938

[jitsi-jenkins]

Hi, thanks for your contribution!
If you haven't already done so, could you please make sure you sign our CLA (https://jitsi.org/icla for individuals and https://jitsi.org/ccla for corporations)? We would unfortunately be unable to merge your patch unless we have that piece :(.

[solomon17705cs]

Oh, I see. Since this is my first contribution I don't know those rules.

Now I completed the CLA process, can you check that