fix(statusbar): make height DPI-aware via GetTextLineHeightWithSpacing

Replace the fixed 22px const Height with a computed property that bakes
in the ImGui font line height plus a GlobalScale-rounded 2px spacer.
The constant clipped the bottom bar on Windows display-scaling >100%
because ImGui rendered the actual font taller than 22px; the bar then
got pushed off the window edge.

ChatLogWindow.cs:423 reservation drops the explicit +2 because the
spacer now lives inside Height. Same idiom as the v1.4.6 F7.2 underline
pill in ChatLogWindow.cs:1639-1653.

v1.4.8 B1. Coverage via in-game smoke on Windows (Jin) and Linux/Wayland
in Task 9 -- DrawList-coupled, no Build-Suite test.

HellionChat/Ui/ChatLogWindow.cs

@@ -419,8 +419,9 @@ public sealed class ChatLogWindow : Window
         // The hint banner renders before this block so ImGui already accounts for it.
         height -= ImGui.GetFrameHeightWithSpacing();
 
-        // Status bar at the window bottom reserves 22px + 2px spacing.
-        height -= StatusBar.Height + 2;
+        // StatusBar.Height now bakes in its own DPI-aware 2px spacer, so the
+        // window reservation is just Height -- no extra +2 (v1.4.8 B1).
+        height -= StatusBar.Height;
 
         return height;
     }