Added a configurable Opus bitrate for audio transcription (#981)

Co-authored-by: Thorsten Sommer <SommerEngineering@users.noreply.github.com>

app/MindWork AI Studio/Components/Settings/SettingsPanelApp.razor

@@ -50,6 +50,7 @@
             </ItemTemplate>
         </ConfigurationSelect>
         <ConfigurationShortcut Data="@this.VoiceRecordingShortcut" OptionDescription="@T("Voice recording shortcut")" OptionHelp="@T("The global keyboard shortcut for toggling voice recording. This shortcut works system-wide, even when the app is not focused.")" IsLocked="() => ManagedConfiguration.TryGet(x => x.App, x => x.ShortcutVoiceRecording, out var meta) && meta.IsLocked"/>
+        <ConfigurationSelect OptionDescription="@T("Transcription audio quality")" SelectedValue="@(() => this.SettingsManager.ConfigurationData.App.OpusBitrate)" Data="@ConfigurationSelectDataFactory.GetTranscriptionOpusBitrateData()" SelectionUpdate="@(selectedValue => this.SettingsManager.ConfigurationData.App.OpusBitrate = selectedValue)" OptionHelp="@this.OpusBitrateHelp" IsLocked="@IsOpusBitrateLocked"/>
     }
 
     @if (this.SettingsManager.ConfigurationData.App.ShowAdminSettings)

app/MindWork AI Studio/Components/Settings/SettingsPanelApp.razor.cs

@@ -79,6 +79,10 @@ public partial class SettingsPanelApp : SettingsPanelBase
         DisplayUpdate = this.UpdateShortcutVoiceRecordingDisplay,
     };
 
+    private string OpusBitrateHelp => T("Higher bitrates can improve transcription accuracy, especially for quiet or noisy recordings, at the cost of a larger upload to the transcription provider. 128 kbps is recommended.");
+
+    private static bool IsOpusBitrateLocked() => ManagedConfiguration.TryGet(x => x.App, x => x.OpusBitrate, out var meta) && meta.IsLocked;
+
     private async Task GenerateEncryptionSecret()
     {
         var secret = EnterpriseEncryption.GenerateSecret();

app/MindWork AI Studio/Components/Settings/SettingsPanelTranscription.razor

@@ -12,7 +12,7 @@
         <MudJustifiedText Typo="Typo.body1" Class="mb-3">
             @T("With the support of transcription models, MindWork AI Studio can convert human speech into text. This is useful, for example, when you need to dictate text. You can choose from dedicated transcription models, but not multimodal LLMs (large language models) that can handle both speech and text. The configuration of multimodal models is done in the 'Configure providers' section.")
         </MudJustifiedText>
-        
+
         <MudTable Items="@this.SettingsManager.GetAllTranscriptionProviders()" Hover="@true" GroupBy="@GROUP_CONFIG" Class="border-dashed border rounded-lg">
             <ColGroup>
                 <col style="width: 12em;"/>

app/MindWork AI Studio/Components/Settings/SettingsPanelTranscription.razor.cs

@@ -36,7 +36,7 @@ public partial class SettingsPanelTranscription : SettingsPanelProviderBase
         var modelName = provider.Model.ToString();
         return modelName.Length > MAX_LENGTH ? "[...] " + modelName[^Math.Min(MAX_LENGTH, modelName.Length)..] : modelName;
     }
-    
+
     #region Overrides of ComponentBase
 
     protected override async Task OnInitializedAsync()