Add newline before completion marker so it doesn't overlap response

The response text has no trailing newline after markdown trim, so the
checkmark was printing on the same line as the last word of the reply.
Add Print(newline) in finish() and fail() so they always start on a
fresh line.

Author: itwizardo

rust/crates/rusty-claude-cli/src/render.rs

@@ -259,10 +259,11 @@ impl Spinner {
         out: &mut impl Write,
     ) -> io::Result<()> {
         self.stop_animation();
-        // Print done message on a new line — don't clear the current line
-        // because it may contain the last line of the AI response.
+        // Newline first so the ✔ never lands on the same line as the
+        // AI response text (which has no trailing newline after trim).
         execute!(
             out,
+            Print("\n"),
             SetForegroundColor(theme.spinner_done),
             Print(format!("✔ {label}\n")),
             ResetColor
@@ -279,6 +280,7 @@ impl Spinner {
         self.stop_animation();
         execute!(
             out,
+            Print("\n"),
             SetForegroundColor(theme.spinner_failed),
             Print(format!("✘ {label}\n")),
             ResetColor