fix: optimize reasoning formatting with targeted regex

- Only apply formatting when ** patterns are detected in the message
- Specifically target titles after sentence endings (. ! ?)
- Addresses performance concern by avoiding regex on every chunk
- Addresses specificity concern by targeting actual section headers
- Prevents false matches on inline bold text mid-sentence

Author: daniel-lxs

src/core/task/Task.ts

@@ -1943,11 +1943,17 @@ export class Task extends EventEmitter<TaskEvents> implements TaskLike {
 						switch (chunk.type) {
 							case "reasoning": {
 								reasoningMessage += chunk.text
-								// Add line breaks before **Title** patterns for better formatting
-								const formattedReasoning = reasoningMessage.replace(
-									/([^\n])\*\*([^*\n]+)\*\*/g,
-									"$1\n\n**$2**",
-								)
+								// Only apply formatting if the message contains sentence-ending punctuation followed by **
+								let formattedReasoning = reasoningMessage
+								if (reasoningMessage.includes("**")) {
+									// Add line breaks before **Title** patterns that appear after sentence endings
+									// This targets section headers like "...end of sentence.**Title Here**"
+									// Handles periods, exclamation marks, and question marks
+									formattedReasoning = reasoningMessage.replace(
+										/([.!?])\*\*([^*\n]+)\*\*/g,
+										"$1\n\n**$2**",
+									)
+								}
 								await this.say("reasoning", formattedReasoning, undefined, true)
 								break
 							}