ui(console): center menu in a bordered box with better spacing

Both renderers now draw the menu inside a centered box with:
- Rounded corners (modern) / box-drawing (VT220)
- Title centered inside the box top
- Section separators as horizontal lines within the box
- Selected item highlighted across the full box width
- Vertical and horizontal centering on screen

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

console/renderers/curses_renderer.py

@@ -167,17 +167,42 @@ class CursesRenderer(BaseRenderer):
 
     def draw_menu(self, items, selected_index=0, title=''):
         h, w = self.get_size()
-        start_row = 3
 
+        # Calculate menu dimensions for centering
+        item_count = len(items)
+        # Find widest label for box sizing
+        max_label = 0
+        for num, label in items:
+            if num != "---" and num != "\u2500":
+                max_label = max(max_label, len(f"  {num}. {label}  "))
+        box_w = max(max_label + 8, 44)
+        box_w = min(box_w, w - 4)
+        box_h = item_count + 4  # top/bottom border + title + blank line
         if title:
-            self._safe_addstr(start_row, 2, title, self._attr("title"))
-            start_row += 2
+            box_h += 2
 
-        visible = h - start_row - 3  # leave room for footer
-        if visible < 1:
-            return
+        # Center the box vertically and horizontally
+        start_row = max((h - box_h) // 2 - 1, 2)
+        start_col = max((w - box_w) // 2, 1)
 
-        # Scrolling offset
+        # Draw box
+        self.draw_box(start_row, start_col, box_h, box_w, "")
+
+        row = start_row + 1
+        if title:
+            # Title centered inside the box
+            title_col = start_col + max((box_w - len(title)) // 2, 2)
+            self._safe_addstr(row, title_col, title,
+                              self._attr("title"))
+            row += 1
+            self._hline(row, start_col + 1, box_w - 2)
+            row += 1
+
+        # Menu items inside the box
+        inner_left = start_col + 3
+        inner_w = box_w - 6
+
+        visible = box_h - (row - start_row) - 1
         offset = 0
         if selected_index >= visible:
             offset = selected_index - visible + 1
@@ -188,19 +213,20 @@ class CursesRenderer(BaseRenderer):
                 break
             if idx < offset:
                 continue
-            row = start_row + drawn
 
             # Separator
             if num == "\u2500" or num == "---":
-                self._hline(row, 2, w - 4)
+                self._hline(row, start_col + 1, box_w - 2)
+                row += 1
                 drawn += 1
                 continue
 
             marker = "\u25b8 " if idx == selected_index else "  "
             text = f"{marker}{num}. {label}"
             style = "highlight" if idx == selected_index else "normal"
-            self._safe_addstr(row, 2, pad_right(text, w - 4),
+            self._safe_addstr(row, inner_left, pad_right(text, inner_w),
                               self._attr(style))
+            row += 1
             drawn += 1
 
     def draw_table(self, headers, rows, widths, page_info=None,