fix: improve TTS filename generation with strict prompt and fallback

- Enhanced system prompt: MUST generate title, NEVER refuse
- Clear instructions for edge cases (empty, inappropriate, nonsensical text)
- Added fallback logic if Hermes returns empty or refusal messages
- Fallback uses first 30 chars of text or 'audio-file' as last resort
- Ensures downloads always have a valid filename

src/tts.js

@@ -203,7 +203,7 @@ export async function generateTitleForTTS(text) {
 				messages: [
 					{
 						role: "system",
-						content: "Generate a concise 5-10 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 Tutorial' or 'Recipe For Chocolate Chip Cookies' or 'JavaScript Array Methods Guide'.",
+						content: "You MUST generate a filename for the text provided. NEVER refuse. Return ONLY a 5-10 word title, nothing else. No quotes, no explanation, no refusal. If the text is inappropriate, nonsensical, or empty, create a descriptive title anyway (e.g., 'Random Text Sample', 'Test Audio File', 'User Generated Content'). Examples: 'Machine Learning Tutorial Notes', 'Daily Journal Entry', 'Shopping List Items'. YOU MUST ALWAYS RETURN A TITLE.",
 					},
 					{
 						role: "user",
@@ -221,8 +221,16 @@ export async function generateTitleForTTS(text) {
 	}
 
 	const data = await response.json();
-	return data.choices[0].message.content
-		.trim()
+	let title = data.choices[0].message.content.trim();
+	
+	// Fallback if Hermes returns empty or refuses
+	if (!title || title.length < 3 || title.toLowerCase().includes("cannot") || title.toLowerCase().includes("inappropriate")) {
+		// Generate a fallback title based on text preview
+		const preview = text.substring(0, 30).replace(/[^\w\s]/g, "").trim();
+		title = preview || "audio-file";
+	}
+	
+	return title
 		.replace(/['"]/g, "") // Remove quotes
 		.replace(/[^\w\s-]/g, "") // Remove special characters except spaces and hyphens
 		.replace(/\s+/g, "-") // Replace spaces with hyphens