feat: improve TTS filename generation with better system prompt

- Enhanced system prompt to generate 3-5 word descriptive filenames
- Added robust text cleaning to remove quotes, special characters
- Limit filename length to 50 chars for filesystem compatibility
- Better dash-separated filename format like 'javascript-tutorial.mp3'

src/tts.js

@@ -183,7 +183,7 @@ export async function generateTitleForTTS(text) {
 				messages: [
 					{
 						role: "system",
-						content: "Generate a concise title for the following text.",
+						content: "Generate a concise 3-5 word filename title for the following text. Return only the title words, no quotes, no explanation. Focus on the main topic or key concept. Example: 'Machine Learning Basics' or 'Recipe For Cookies' or 'JavaScript Tutorial'.",
 					},
 					{
 						role: "user",
@@ -203,8 +203,12 @@ export async function generateTitleForTTS(text) {
 	const data = await response.json();
 	return data.choices[0].message.content
 		.trim()
-		.replace(/\s+/g, "-")
-		.toLowerCase();
+		.replace(/['"]/g, "") // Remove quotes
+		.replace(/[^\w\s-]/g, "") // Remove special characters except spaces and hyphens
+		.replace(/\s+/g, "-") // Replace spaces with hyphens
+		.replace(/-+/g, "-") // Replace multiple hyphens with single
+		.toLowerCase()
+		.substring(0, 50); // Limit length for filesystem compatibility
 }
 
 // Handle TTS from element (for modal usage)