Update input mode controls: adjust shortcuts, revise display titles, and remove Shift+Enter instructions.

crates/owlen-tui/src/ui.rs

@@ -413,7 +413,7 @@ fn render_messages(frame: &mut Frame<'_>, area: Rect, app: &ChatApp) {
 
 fn render_input(frame: &mut Frame<'_>, area: Rect, app: &ChatApp) {
     let title = match app.mode() {
-        InputMode::Editing => " Input (Enter=send · Shift+Enter/Ctrl+J=newline) ",
+        InputMode::Editing => " Input (Enter=send · Ctrl+J=newline · Esc=exit input mode) ",
         _ => " Input (Press 'i' to start typing) ",
     };
 
@@ -637,7 +637,6 @@ fn render_help(frame: &mut Frame<'_>) {
         Line::from("Controls:"),
         Line::from("  i / Enter   → start typing"),
         Line::from("  Enter       → send message"),
-        Line::from("  Shift+Enter → newline"),
         Line::from("  Ctrl+J      → newline"),
         Line::from("  m           → select model"),
         Line::from("  n           → new conversation"),