Grow interactive prompt pane to 75% of the screen

Claude Code clips AskUserQuestion option lists to the rows available;
60% was still cutting options off. Also relax the upper clamp so small
terminals give the prompt as much as possible (6 rows reserved).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/ui.rs

@@ -194,12 +194,14 @@ fn event_loop(
 fn draw(f: &mut Frame, app: &SharedApp, eui: &mut EmbedUi) {
     let mut a = app.lock().unwrap();
     // Embedded pane height: nothing when hidden; ~35% of the screen normally,
-    // ~60% while the tap says an interactive prompt is on screen.
+    // 75% while the tap says an interactive prompt is on screen — Claude
+    // Code's question UI clips its option list to the rows it gets, so the
+    // prompt wants as much height as we can spare.
     let show_embed = eui.visible && eui.term.is_some();
     let embed_h = if show_embed {
         let total = f.area().height;
-        let pct = if a.embed_grow { 60 } else { 35 };
-        ((total as u32 * pct / 100) as u16).clamp(10, total.saturating_sub(10))
+        let pct = if a.embed_grow { 75 } else { 35 };
+        ((total as u32 * pct / 100) as u16).clamp(10, total.saturating_sub(6))
     } else {
         0
     };