fix: Comprehensive markdown/formatting cleanup for TTS (Piper + XTTS)

- Remove **bold**, *italic*, `code`, code blocks, links, headers, quotes, lists
- Replace newlines with natural pauses (period/comma)
- Remove quotation marks, empty brackets
- Fixes text being swallowed/garbled by TTS engines

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

bridge/aria_bridge.py

@@ -201,11 +201,23 @@ class VoiceEngine:
             return None
 
         try:
-            # Langen Text in Saetze aufteilen (Piper hat Limits bei langen Texten)
+            # Markdown + Sonderzeichen entfernen fuer natuerliche Sprache
             import re
-            sentences = re.split(r'(?<=[.!?])\s+', text.strip())
-            # Markdown-Formatierung entfernen
-            sentences = [re.sub(r'\*\*([^*]+)\*\*', r'\1', s).strip() for s in sentences if s.strip()]
+            clean = text.strip()
+            clean = re.sub(r'\*\*([^*]+)\*\*', r'\1', clean)  # **fett**
+            clean = re.sub(r'\*([^*]+)\*', r'\1', clean)      # *kursiv*
+            clean = re.sub(r'`[^`]+`', '', clean)              # `code`
+            clean = re.sub(r'```[\s\S]*?```', '', clean)       # Code-Bloecke
+            clean = re.sub(r'\[([^\]]+)\]\([^)]+\)', r'\1', clean)  # [text](url)
+            clean = re.sub(r'#{1,6}\s*', '', clean)            # ### Ueberschriften
+            clean = re.sub(r'>\s*', '', clean)                 # > Zitate
+            clean = re.sub(r'[-*]\s+', '', clean)              # Listen
+            clean = re.sub(r'\n{2,}', '. ', clean)             # Absaetze
+            clean = re.sub(r'\n', ', ', clean)                 # Zeilenumbrueche
+            clean = re.sub(r'\s{2,}', ' ', clean)              # Mehrfach-Leerzeichen
+            clean = re.sub(r'["""„]', '', clean)               # Anfuehrungszeichen
+            sentences = re.split(r'(?<=[.!?])\s+', clean)
+            sentences = [s.strip() for s in sentences if s.strip()]
 
             if not sentences:
                 return None