fix(gui): shared height for Files & Media sections

- Calculate avail at window level, divide by num_open sections
- Pass height_override to _render_files_panel and _render_screenshots_panel
- When both open: each gets equal share of available space
- When one open: it gets full available space

src/gui_2.py

@@ -873,14 +873,21 @@ class App:
    if self.show_windows.get("Files & Media", False):
     exp, opened = imgui.begin("Files & Media", self.show_windows["Files & Media"])
     self.show_windows["Files & Media"] = bool(opened)
+    if opened:
      if exp:
+      avail = imgui.get_content_region_avail().y
+      # Determine how many sections will render
+      files_hdr = imgui.collapsing_header("Files")
+      shots_hdr = imgui.collapsing_header("Screenshots")
+      num_open = (1 if files_hdr else 0) + (1 if shots_hdr else 0)
+      section_h = avail / max(num_open, 1)
       # BEGIN Files section
-     if imgui.collapsing_header("Files"):
+      if files_hdr:
-      self._render_files_panel()
+       self._render_files_panel(section_h - 80)
       # END Files section
       # BEGIN Screenshots section
-     if imgui.collapsing_header("Screenshots"):
+      if shots_hdr:
-      self._render_screenshots_panel()
+       self._render_screenshots_panel(section_h - 80)
       # END Screenshots section
      imgui.end()
    # END Files & Media window
@@ -2912,7 +2919,7 @@ def hello():
   markdown_helper.render(md)
 
 
- def _render_files_panel(self) -> None:
+ def _render_files_panel(self, height_override: float = 0) -> None:
   if self.perf_profiling_enabled: self.perf_monitor.start_component("_render_files_panel")
   imgui.text("Paths")
   imgui.same_line()
@@ -2927,7 +2934,10 @@ def hello():
    r.destroy()
    if d: self.ui_files_base_dir = d
   imgui.separator()
-  # Calculate content-based height: row_count * 28px + header, max 300px
+  # Calculate content-based height: use override if provided, else content-based
+  if height_override > 0:
+   child_h = height_override
+  else:
     row_count = max(len(self.files), 1)
     child_h = min(row_count * 28 + 40, 300)
   # BEGIN f_paths child window
@@ -2989,7 +2999,7 @@ def hello():
 
   if self.perf_profiling_enabled: self.perf_monitor.end_component("_render_files_panel")
 
- def _render_screenshots_panel(self) -> None:
+ def _render_screenshots_panel(self, height_override: float = 0) -> None:
   if self.perf_profiling_enabled: self.perf_monitor.start_component("_render_screenshots_panel")
   imgui.text("Paths")
   imgui.same_line()
@@ -3004,7 +3014,10 @@ def hello():
    r.destroy()
    if d: self.ui_shots_base_dir = d
   imgui.separator()
-  # Calculate content-based height: row_count * 28px + header, max 200px
+  # Calculate content-based height: use override if provided, else content-based
+  if height_override > 0:
+   shot_h = height_override
+  else:
     shot_count = max(len(self.screenshots), 1)
     shot_h = min(shot_count * 28 + 40, 200)
   # BEGIN s_paths child window