fix: strictly restrict live streaming to Soniox AI-edited finalized tokens (is_final == true)

src/SonioxClient.swift

@@ -317,28 +317,22 @@ public final class SonioxLiveSession {
                 }
             }
             
-            // Ultra-responsive real-time word-by-word streaming:
-            // A word in 'combined' is completed as soon as a whitespace character follows it.
+            // Emit live streaming deltas STRICTLY from Soniox-finalized tokens (is_final == true):
             var deltaToEmit: String? = nil
-            if !triggerDetected {
-                if let lastSpaceRange = combined.rangeOfCharacter(from: .whitespacesAndNewlines, options: .backwards) {
-                    let stablePortion = String(combined[..<lastSpaceRange.upperBound])
-                    if stablePortion.count > streamedPrefix.count {
-                        if stablePortion.hasPrefix(streamedPrefix) {
-                            let delta = String(stablePortion.dropFirst(streamedPrefix.count))
-                            streamedPrefix = stablePortion
+            if !triggerDetected && fullCommitted.count > streamedPrefix.count {
+                if fullCommitted.hasPrefix(streamedPrefix) {
+                    let delta = String(fullCommitted.dropFirst(streamedPrefix.count))
+                    streamedPrefix = fullCommitted
                     deltaToEmit = delta
                 } else {
-                            let common = stablePortion.commonPrefix(with: streamedPrefix)
-                            if stablePortion.count > common.count {
-                                let delta = String(stablePortion.dropFirst(common.count))
-                                streamedPrefix = stablePortion
+                    let common = fullCommitted.commonPrefix(with: streamedPrefix)
+                    if fullCommitted.count > common.count {
+                        let delta = String(fullCommitted.dropFirst(common.count))
+                        streamedPrefix = fullCommitted
                         deltaToEmit = delta
                     }
                 }
             }
-                }
-            }
             lock.unlock()
             
             if triggerDetected {