TextToTalk crash Dalamud due to an unhandled SSML parsing exception.

Environment:
- Windows 11
- Dalamud 14.0.0.3
- TextToTalk 1.35.3.0 (testing)
- System backend (System.Speech)

Error excerpt:
System.FormatException: XML content not valid.
System.Xml.XmlException: Name cannot begin with the '3' character
at System.Speech.Internal.Synthesis.SsmlParser.Parse(...)
at TextToTalk.Backends.System.SystemSoundQueue.ASyncSpeak(...)

This occurs during normal playback (e.g. player chat), without TextAdvance or manual cancellation.
It appears that invalid SSML generated from runtime text is passed to System.Speech without validation or exception handling.

Result:
Unhandled exception on a worker thread causes a CLR crash and terminates Dalamud/FFXIV.

Expected:
Invalid SSML should be caught and ignored, sanitized, or fall back to plain text instead of crashing the host.

Dalamud crash log:

[dalamud_appcrash_20260103_174753_645_3264.log](https://github.com/user-attachments/files/24416882/dalamud_appcrash_20260103_174753_645_3264.log)