feat(map-editor): wire Window toggles to hide side panel + palette

Both render and click handlers are now gated by the
is_layers_panel_shown / is_palette_shown predicates, so the new
Window menu toggles produce visible effects in the editor.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

init.lua

@@ -1280,8 +1280,12 @@ local ui = (function()
         end
         draw_top_toolbar(mx, my)
         draw_mode_pill()
+        if state.is_layers_panel_shown() then
             draw_side_panel(mx, my)
+        end
+        if state.is_palette_shown() then
             draw_palette(mx, my)
+        end
         draw_status(mx, my)
         local mid = state.get_modal_open()
         if mid and MODALS[mid] then
@@ -1490,6 +1494,7 @@ local ui = (function()
         end
 
         -- Bottom palette swatches: left = select slot
+        if state.is_palette_shown() then
             for _, sw in ipairs(palette_swatches_layout()) do
                 if in_rect(mx, my, sw.x, sw.y, sw.w, sw.h) then
                     if button == "left" then
@@ -1498,8 +1503,10 @@ local ui = (function()
                     return true
                 end
             end
+        end
 
         -- Side-panel layer rows: left = set active; right = toggle visibility
+        if state.is_layers_panel_shown() then
             for _, row in ipairs(side_panel_rows_layout()) do
                 if in_rect(mx, my, row.eye_x, row.eye_y, row.eye_w, row.eye_h) then
                     if button == "left" then
@@ -1516,6 +1523,7 @@ local ui = (function()
                     return true
                 end
             end
+        end
 
         -- Status chip — no-op fallback to claim the click area
         local s = status_layout()