feat: dictation segmentation on blank lines

src/segment.rs

@@ -1 +1,20 @@
-// implemented in a later task
+/// Split a dictation into Befund segments on Markdown paragraph
+/// breaks (one or more blank lines). Trims each segment; drops empties.
+pub fn split_segments(dictation: &str) -> Vec<String> {
+    let mut segments = Vec::new();
+    let mut current: Vec<&str> = Vec::new();
+    for line in dictation.lines() {
+        if line.trim().is_empty() {
+            if !current.is_empty() {
+                segments.push(current.join("\n").trim().to_string());
+                current.clear();
+            }
+        } else {
+            current.push(line);
+        }
+    }
+    if !current.is_empty() {
+        segments.push(current.join("\n").trim().to_string());
+    }
+    segments.into_iter().filter(|s| !s.is_empty()).collect()
+}