editor ui rework

add responsive editor relayout for window resize
rework header with back/save, view mode buttons, and 2d view type selector
add clipped, scrollable assets and contextual tool panels
simplify tool button wiring and repeated layout logic
simplify 2d top-down editor internals and shared grid update hooks

1 files changed, 19 insertions, 4 deletions

diff --git a/src/gui/button.cpp b/src/gui/button.cpp
index 2b57772..1548e0e 100644
--- a/src/gui/button.cpp
+++ b/src/gui/button.cpp
@@ -5,15 +5,30 @@ void gui_button_draw_fn( void* ptr ) {
 
   I32 x = gui_relx( btn );
   I32 y = gui_rely( btn );
+  I32 mx, my;
+  gui_cursor_pos( &mx, &my );
+  U8 inbounds = mx >= x && mx <= x + btn->w && my >= y && my <= y + btn->h;
+  U8 active = btn->held && inbounds && gui_mbutton_down( GUI_MBTNLEFT );
+  U8 hover = inbounds && !active;
+
+  CLR border = gui_is_fg_window( btn )? ui_clr.border : ui_clr.border_inactive;
+  if( active )
+    border = { 0.f, 1.f, 0.f, 1.f };
+
+  CLR fill = ui_clr.bg_sec;
+  CLR txt = ui_clr.txt;
+  if( hover ) {
+    fill = ui_clr.border;
+    txt = CLR::BLACK();
+  }
 
-  CLR col = gui_is_fg_window( btn )? ui_clr.border : ui_clr.border_inactive;
-  gui_draw_frect( x, y, btn->w, btn->h, col );
-  gui_draw_frect( x+1, y+1, btn->w-2, btn->h-2, ui_clr.bg_sec );
+  gui_draw_frect( x, y, btn->w, btn->h, border );
+  gui_draw_frect( x+1, y+1, btn->w-2, btn->h-2, fill );
 
   I32 middle = x + btn->w/2;
   I32 middle_y = y + btn->h/2 - 7;
 
-  gui_draw_str( middle, middle_y, ALIGN_C, FNT_JPN12, ui_clr.txt, btn->name );
+  gui_draw_str( middle, middle_y, ALIGN_C, FNT_JPN12, txt, btn->name );
 }
 
 void gui_button_input_fn( void* ptr ) {