fix(gui): improve tool preset manager adaptive sizing

- When both sections open: use min(h, max(200, rem_y*0.3)) for tools, min(h, max(150, rem_y*0.5)) for bias
- Single section open: cap at 400px instead of hard small values
- This preserves split ratio while ensuring minimum readable sizes

src/gui_2.py

@@ -1760,12 +1760,18 @@ class App:
      imgui.end_table()
 
     rem_y = imgui.get_content_region_avail().y - 80
-    if self._tool_list_open and self._bias_list_open: h1, h2 = rem_y * self._tool_split_v, rem_y - (rem_y * self._tool_split_v) - 10
-    elif self._tool_list_open: h1, h2 = rem_y, 0
-    elif self._bias_list_open: h1, h2 = 0, rem_y
-    else: h1, h2 = 0, 0
-    h1 = min(h1, 250)
-    h2 = min(h2, 200)
+    if self._tool_list_open and self._bias_list_open:
+     h1, h2 = rem_y * self._tool_split_v, rem_y - (rem_y * self._tool_split_v) - 10
+     h1 = min(h1, max(200, rem_y * 0.3))
+     h2 = min(h2, max(150, rem_y * 0.5))
+    elif self._tool_list_open:
+     h1 = min(rem_y, 400)
+     h2 = 0
+    elif self._bias_list_open:
+     h1 = 0
+     h2 = min(rem_y, 400)
+    else:
+     h1, h2 = 0, 0
 
     imgui.dummy(imgui.ImVec2(0, 4))
     opened_t = imgui.collapsing_header("Categories & Tools", imgui.TreeNodeFlags_.default_open)